UP TGT 2016 — Science (Series A)

Science

1. 1. If we throw a body upwards with velocity of 4 m/s, at what height its kinetic energy reduces to half of the initial value ? Take g = 10 m/s².

   • (a) 4m
   • (b) 2m
   • (c) 1m
   • (d) 0.4m
   उत्तर देखें

   उत्तर: (d)

2. 2. Nernst equation relates electrode potential with

   • (a) Temperature
   • (b) Concentration
   • (c) Temperature and concentration
   • (d) Temperature and pressure
   उत्तर देखें

   उत्तर: (c)

3. 3. A body of mass m that is undergoing simple harmonic motion passes through its equilibrium position, its velocity is

   • (a) zero
   • (b) maximum
   • (c) half of its maximum value
   • (d) none of the above
   उत्तर देखें

   उत्तर: (b)

4. 4. When hydrogen atom is raised from the ground state to an excited state

   • (a) P.E. increases and K.E. decreases
   • (b) P.E. decreases and K.E. increases
   • (c) Both P.E. and K.E. increases
   • (d) Both P.E. and K.E. decreases
   उत्तर देखें

   उत्तर: (a)

5. 5. Transition metals form complexes due to

   • (a) Small size
   • (b) Available d orbital
   • (c) Large ionic charge
   • (d) All the above
   उत्तर देखें

   उत्तर: (d)

6. 6. Three resistors having resistances in the ratio 1 : 2 : 3 are in parallel. The current through the resistors are in the ratio

   • (a) 1 : 2 : 3
   • (b) 2 : 3 : 1
   • (c) 3 : 2 : 1
   • (d) 6 : 3 : 2
   उत्तर देखें

   उत्तर: (d)

7. 7. A metal surface is illuminated by a light of given intensity and frequency to cause photoemission. If the intensity of illumination is reduced to one fourth of its original value, then the maximum kinetic energy of the emitted photoelectrons would becomes

   • (a) unchanged
   • (b) 1/16ᵗʰ of original value
   • (c) twice the original value
   • (d) four times the original value
   उत्तर देखें

   उत्तर: (a)

8. 8. Among the following, the one which has maximum ionic character is

   • (a) NaCl
   • (b) KCl
   • (c) LiCl
   • (d) CsCl
   उत्तर देखें

   उत्तर: (d)

9. 9. Which of the following is not essential for the simple harmonic motion ?

   • (a) Inertia
   • (b) Restoring force
   • (c) Material medium
   • (d) Gravity
   उत्तर देखें

   उत्तर: —

10. 10. The charge of an electron is

    • (a) 1.6 × 10⁻²⁴ C
    • (b) 1.8 × 10⁻¹⁹ C
    • (c) 1.6 × 10⁻¹⁹ C
    • (d) 1.6 × 10⁻¹⁷ C
    उत्तर देखें

    उत्तर: (c)

11. 11. The substances which are attracted by the magnetic field are

    • (a) Diamagnetic
    • (b) Paramagnetic
    • (c) Ferromagnetic
    • (d) Ferrimagnetic
    उत्तर देखें

    उत्तर: —

12. 12. Outdoors on the winter, why does a piece of metal feel colder than a piece of wood ?

    • (a) Metal is a good conductor of heat than wood
    • (b) Wood is a good conductor of heat than metal
    • (c) Wood conducts heat faster than metal
    • (d) Both the metal and wood are bad conductors of heat
    उत्तर देखें

    उत्तर: (a)

13. 13. Which of the following statements is not correct ?

    • (a) A secondary cell may be recharged after use.
    • (b) A nickel–cadmium cell is an example of a primary cell.
    • (c) A Leclanche cell is suitable for use in torches.
    • (d) When a cell is being charged its terminal p.d. exceeds the cell e.m.f.
    उत्तर देखें

    उत्तर: —

14. 14. The most electropositive halogen is

    • (a) F
    • (b) Cl
    • (c) Br
    • (d) I
    उत्तर देखें

    उत्तर: (d)

15. 15. For which of the following pair of resistors, the balancing length is not 0.25 m in a meter bridge ?

    • (a) 1 Ω, 3 Ω
    • (b) 7/3 Ω, 7 Ω
    • (c) 25 Ω, 75 Ω
    • (d) 2 Ω, 3 Ω
    उत्तर देखें

    उत्तर: (d)

16. 16. Transition metals in their compounds show

    • (a) Ionic bonds
    • (b) Covalent bonds
    • (c) Metallic bonds
    • (d) Ionic and coordinate bonds
    उत्तर देखें

    उत्तर: (d)

17. 17. The first law of thermodynamic for an adiabatic process is

    • (a) du = δW
    • (b) du = 0
    • (c) du = – δW
    • (d) du = – δH + 2 δW
    उत्तर देखें

    उत्तर: —

18. 18. The II group elements in the periodic table is known as

    • (a) Alkali metals
    • (b) Alkaline earth metals
    • (c) Lanthanides
    • (d) Transition metals
    उत्तर देखें

    उत्तर: (b)

19. 19. The wavelength in the bright-line emission spectrum of an element are

    • (a) characteristic of the particular element
    • (b) the same for all the elements
    • (c) evenly distributed throughout the visible spectrum
    • (d) different from the wavelengths in its dark-line absorption spectrum
    उत्तर देखें

    उत्तर: (a)

20. 20. Which of the following will not give a carbocation as an intermediate ?

    • (a) Ethyl magnesium halide
    • (b) Methyl bromide
    • (c) Vinyl chloride
    • (d) Ethanol
    उत्तर देखें

    उत्तर: (a)

21. 21. The Azimuthal quantum number for p and f orbitals are respectively

    • (a) 0 and 2
    • (b) 1 and 3
    • (c) 1 and 2
    • (d) 2 and 3
    उत्तर देखें

    उत्तर: (b)

22. 22. The cell reaction of a secondary battery is

    • (a) Reversible
    • (b) Irreversible
    • (c) Equilibrium
    • (d) Endothermic
    उत्तर देखें

    उत्तर: (a)

23. 23. The dimension of 1/(μ₀ ∈₀), where μ₀ represents vacuum permeability and ∈₀ represents vacuum permittivity

    • (a) L⁻¹T
    • (b) L²T⁻²
    • (c) L⁻²T²
    • (d) LT⁻¹
    उत्तर देखें

    उत्तर: (b)

24. 24. The metal used to detect nitrogen in an organic compound is

    • (a) Li
    • (b) K
    • (c) Na
    • (d) Cs
    उत्तर देखें

    उत्तर: (c)

25. 25. If two satellites of masses m₁ and m₂ are revolving around a earth in a circular orbits of radius r₁ and r₂, then the ratio of their orbital velocities v₁/v₂ is

    • (a) √(r₂/r₁)
    • (b) √(r₁/r₂)
    • (c) r₁/r₂
    • (d) r₂/r₁
    उत्तर देखें

    उत्तर: (a)

26. 26. Which of the following contain ionic, co-ordinate and covalent bonds ?

    • (a) NaCN
    • (b) NaCl
    • (c) NaNC
    • (d) NaOH
    उत्तर देखें

    उत्तर: (c)

27. 27. When a resistance R connected in series with a galvanometer of resistance 100 Ω, it acts as a voltmeter. To double the range of the voltmeter, a resistance of 1000 Ω is to be connected in series with R. Then the value of R is (in Ω)

    • (a) 1000
    • (b) 1100
    • (c) 800
    • (d) 900
    उत्तर देखें

    उत्तर: (d)

28. 28. If earth has a mass nine times and radius twice that of the planet mars, calculate the maximum velocity required by a rocket to escape from the gravitational field of mars. Take escape velocity on the earth’s surface to be 11.2 km/s.

    • (a) 5.279 km/s
    • (b) 23.75 km/s
    • (c) 9144 km/s
    • (d) 3.865 km/s
    उत्तर देखें

    उत्तर: (a)

29. 29. The d block elements are

    • (a) All metals
    • (b) All non-metals
    • (c) Metals and non-metals
    • (d) Metalloids
    उत्तर देखें

    उत्तर: (a)

30. 30. Which thermometer is preferred for rapidly changing temperature ?

    • (a) Liquid in glass
    • (b) Gas thermometer
    • (c) Resistance thermometer
    • (d) Thermoelectric thermometer
    उत्तर देखें

    उत्तर: (d)

31. 31. Reaction of aniline with excess of bromine water gives

    • (a) 2-Bromoaniline
    • (b) 3-Bromoaniline
    • (c) 2, 4-Dibromoaniline
    • (d) 2, 4-6-Tribromoaniline
    उत्तर देखें

    उत्तर: (d)

32. 32. The alternating current cannot be used for

    • (a) heating
    • (b) lighting
    • (c) generate mechanical energy
    • (d) electroplating
    उत्तर देखें

    उत्तर: (d)

33. 33. In the voltaic cell, the reaction occur at anode is

    • (a) Oxidation
    • (b) Reduction
    • (c) Elimination
    • (d) Addition
    उत्तर देखें

    उत्तर: (a)

34. 34. The lift is moving down with an acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are, respectively

    • (a) g, g
    • (b) g – a, g – a
    • (c) g – a, g
    • (d) a, g
    उत्तर देखें

    उत्तर: (c)

35. 35. The difference in isotopes of an element is

    • (a) Mass number
    • (b) Atomic number
    • (c) Number of electrons
    • (d) Number of protons
    उत्तर देखें

    उत्तर: (a)

36. 36. Among the following, the conducting form of carbon is

    • (a) Diamond
    • (b) Charcoal
    • (c) Graphite
    • (d) All the above
    उत्तर देखें

    उत्तर: (c)

37. 37. Which of the following is most acidic ?

    • (a) Phenol
    • (b) Benzyl alcohol
    • (c) Cyclohexanol
    • (d) m-chlorophenol
    उत्तर देखें

    उत्तर: (d)

38. 38. A p-type of semiconductor is

    • (a) uncharged
    • (b) +vely charged
    • (c) – vely charged
    • (d) uncharged only at 0°C
    उत्तर देखें

    उत्तर: (a)

39. 39. Which one of the following molecule is less reactive towards electrophilic aromatic substitution ?

    • (a) Aniline
    • (b) Toluene
    • (c) Nitrobenzene
    • (d) Phenol
    उत्तर देखें

    उत्तर: (c)

40. 40. Work done by an ideal gas when it expands from volume (V₁) to (V₂) under constant pressure is

    • (a) V₁V₂ / P
    • (b) P V₁V₂
    • (c) P (V₂ – V₁)
    • (d) (V₁ + V₂) P
    उत्तर देखें

    उत्तर: (c)

41. 41. In Wheatstone bridge method of finding unknown resistance or inductance, the instrument used as null detector is

    • (a) Ammeter
    • (b) Voltmeter
    • (c) Galvanometer
    • (d) All of these
    उत्तर देखें

    उत्तर: (c)

42. 42. Among the following derivatives of ethane, the one having the highest boiling point is

    • (a) C₂H₅F
    • (b) C₂H₅Cl
    • (c) C₂H₅Br
    • (d) C₂H₅I
    उत्तर देखें

    उत्तर: (d)

43. 43. The combination of atoms take place due to

    • (a) Acquire stability by increase in energy
    • (b) Acquire stability by decrease in energy
    • (c) Acquire high energy state
    • (d) Acquire instability
    उत्तर देखें

    उत्तर: (b)

44. 44. The two ends of a metal rod are maintained at temperature 100°C and 110°C. The rate of heat flow in the rod is found to be 4.0 J/s. If the two ends of a metal rod are maintained at temperature 200°C and 210°C, the rate of heat flow will be

    • (a) 8.0 J/s
    • (b) 4.0 J/s
    • (c) 44.0 J/s
    • (d) 16.0 J/s
    उत्तर देखें

    उत्तर: (b)

45. 45. Chlorination of benzene under photochemical condition takes place by

    • (a) Nucleophilic substitution
    • (b) Electrophilic substitution
    • (c) Free radical mechanism
    • (d) Carbocation intermediate
    उत्तर देखें

    उत्तर: (c)

46. 46. A string of certain length used to whirl a stone in a vertical circle with certain velocity. The tension developed in the string will be

    • (a) same along the circle
    • (b) highest at the top of the circle
    • (c) least at the top of the circle
    • (d) highest at the bottom of the circle
    उत्तर देखें

    उत्तर: —

47. 47. The autocatalyst formed in the reaction of acidified potassium permanganate with oxalic acid at high temperature is

    • (a) MnSO₄
    • (b) MnO₂
    • (c) MnSO₃
    • (d) Mn₂O₃
    उत्तर देखें

    उत्तर: (a)

48. 48. An autocatalyst is

    • (a) One which speeds up the catalyst action
    • (b) One of the products of a reaction acts as a catalyst
    • (c) One of the reactants act as catalyst
    • (d) Both the reactants act as a catalyst
    उत्तर देखें

    उत्तर: (b)

49. 49. On continuous exposure to air, sodium finally changes to

    • (a) NaCl
    • (b) Na₂CO₃
    • (c) Na₂O
    • (d) Na₂O₂
    उत्तर देखें

    उत्तर: (b)

50. 50. The weakest of the four fundamental interactions is the

    • (a) gravitational
    • (b) electro-magnetic
    • (c) strong
    • (d) weak
    उत्तर देखें

    उत्तर: (a)

51. 51. Impossible orbitals among the following is

    • (a) 2s
    • (b) 2p
    • (c) 3f
    • (d) 4d
    उत्तर देखें

    उत्तर: (c)

52. 52. If P, Q, R and S represents resistances of 4 arms of the Wheatstone’s bridge, then the sensitivity of Wheatstone’s bridge will be maximum when

    • (a) P = Q = R > S
    • (b) P = Q = R = S
    • (c) P > Q > R > S
    • (d) P < Q < R < S
    उत्तर देखें

    उत्तर: (b)

53. 53. Iodoform reaction is a confirmatory test for compounds having

    • (a) – COH₃
    • (b) – CH₃
    • (c) – CONH₂
    • (d) – COOH
    उत्तर देखें

    उत्तर: —

54. 54. Heat transfers by the process of convection occurs

    • (a) only in liquids
    • (b) only in solids
    • (c) only in liquids and gases
    • (d) in solids, liquids and gases
    उत्तर देखें

    उत्तर: (c)

55. 55. If the earth is ¼ of its present distance from the sun, then the duration of the year would be

    • (a) ½ year
    • (b) ¼ year
    • (c) 1/8 year
    • (d) 1/16 year
    उत्तर देखें

    उत्तर: (c)

56. 56. The mean life of a radioactive substance is

    • (a) Equal to disintegration constant
    • (b) Reciprocal of disintegration constant
    • (c) Directly proportional to disintegration constant
    • (d) Multiples of disintegration constant
    उत्तर देखें

    उत्तर: (b)

57. 57. Benzoic acid on reacting with lithium aluminium hydride gives

    • (a) Benzene
    • (b) Benzyl alcohol
    • (c) Toluene
    • (d) None of the above
    उत्तर देखें

    उत्तर: (b)

58. 58. The cathodic material present in dry cell is

    • (a) MgO₂
    • (b) MgO
    • (c) MnO₂
    • (d) Zn
    उत्तर देखें

    उत्तर: (d)

59. 59. Which one of the following will release ammonia on hydrolysis ?

    • (a) Nitrobenzene
    • (b) Acetanilide
    • (c) Benzamide
    • (d) Phenyl benzoate
    उत्तर देखें

    उत्तर: (c)

60. 60. A converging lens of focal length f is placed in contact with a diverging lens of focal length 3f. The combination is

    • (a) A diverging lens of focal length 3f/2
    • (b) A converging lens of focal length 2f
    • (c) A diverging lens of focal length 3f
    • (d) A converging lens of focal length 3f/2
    उत्तर देखें

    उत्तर: (d)

61. 61. Which of the following is an example for addition reaction ?

    • (a) Friedel Crafts reaction
    • (b) Aldol reaction
    • (c) Bromination of phenol
    • (d) Nitration of benzene
    उत्तर देखें

    उत्तर: (b)

62. 62. The energy that heats the sun has its origin in

    • (a) radioactivity
    • (b) nuclear fission
    • (c) the production of helium from hydrogen
    • (d) the production of hydrogen from helium
    उत्तर देखें

    उत्तर: (c)

63. 63. Among the following one which does not exist is

    • (a) NF₅
    • (b) SbF₅
    • (c) PF₅
    • (d) AsF₅
    उत्तर देखें

    उत्तर: (a)

64. 64. According to Mendeleev’s periodic law, the physical and chemical properties of elements are periodic functions of their

    • (a) Atomic numbers
    • (b) Atomic weights
    • (c) Number of electrons
    • (d) Number of protons
    उत्तर देखें

    उत्तर: (b)

65. 65. A women whose mass is 60 kg on the earth surface is in an spacecraft at an altitude of two times the earth radius. Her mass there is

    • (a) 6.7 kg
    • (b) 15 kg
    • (c) 20 kg
    • (d) 60 kg
    उत्तर देखें

    उत्तर: (d)

66. 66. Two pendulums oscillate with a constant phase difference of 90°. If time period of one of them is 2 sec., then period of the other is

    • (a) 2 sec.
    • (b) 4 sec.
    • (c) 1 sec.
    • (d) 6 sec.
    उत्तर देखें

    उत्तर: (a)

67. 67. Chlorine is

    • (a) Oxidizing agent
    • (b) Bleaching agent
    • (c) Disinfectant
    • (d) All the above
    उत्तर देखें

    उत्तर: (d)

68. 68. Daniel cell consists of

    • (a) Zn and Cu as electrodes
    • (b) Zn and Fe as electrodes
    • (c) Zn and Si as electrodes
    • (d) Zn and Ag as electrodes
    उत्तर देखें

    उत्तर: (a)

69. 69. The work done on a body by an external force contributes to a change in its

    • (a) Potential energy
    • (b) Total energy
    • (c) Kinetic energy
    • (d) Heat energy
    उत्तर देखें

    उत्तर: (c)

70. 70. The most electropositive element in the periodic table is

    • (a) Iron
    • (b) Copper
    • (c) Caesium
    • (d) Lithium
    उत्तर देखें

    उत्तर: (c)

71. 71. In the Bohr model of the hydrogen atom, let R, V and E represent the radius of the orbit, the speed of the electron and the total energy of the electron respectively. Which of the following quantity is proportional to the quantum number n ?

    • (a) VR
    • (b) RE
    • (c) E / V
    • (d) R / E
    उत्तर देखें

    उत्तर: (a)

72. 72. The ratio of the number of turns in primary and secondary coils of transformer is 1 : 20. The ratio of the currents in the primary and the secondary coils will be

    • (a) 1 : 20
    • (b) 20 : 1
    • (c) 1 : 400
    • (d) 400 : 1
    उत्तर देखें

    उत्तर: (b)

73. 73. The process of converting alkyl halides to alcohols involve

    • (a) Addition reaction
    • (b) Rearrangement reaction
    • (c) Substitution reaction
    • (d) Dehydrohalogenation reaction
    उत्तर देखें

    उत्तर: (c)

74. 74. The thermal conductivities of brick and pine wood are, respectively 0.6 and 0.13 W/(m.°C). What thickness of brick has the same insulating ability at 5 cm of pine ?

    • (a) 23 cm
    • (b) 4.6 cm
    • (c) 30 cm
    • (d) 5 cm
    उत्तर देखें

    उत्तर: (a)

75. 75. A rectangular metal plate 8 cm × 4 cm at 127°C emits E J/s. If both the length and breadth are halved and the temperature is raised to 327°C, the rate of emission is (J/s)

    • (a) (27/8) E
    • (b) (81/64) E
    • (c) (10/9) E
    • (d) (9/4) E
    उत्तर देखें

    उत्तर: (b)

76. 76. A beam of transverse waves whose vibrations occur in all directions perpendicular to their direction of motion is

    • (a) polarised
    • (b) unpolarised
    • (c) resolved
    • (d) diffracted
    उत्तर देखें

    उत्तर: (b)

77. 77. Among the following, the one has highest mass is

    • (a) 40 g of Fe
    • (b) 6 moles of N₂ at NTP
    • (c) 0.2 g of silver
    • (d) 10²³ atoms of carbon
    उत्तर देखें

    उत्तर: (b)

78. 78. A 2.5 kg iron ball has the same diameter as a 1.25 kg aluminium ball. The balls are dropped at the same time from a cliff. Just before they reach the ground, they have same

    • (a) acceleration
    • (b) momentum
    • (c) kinetic energy
    • (d) potential energy
    उत्तर देखें

    उत्तर: (a)

79. 79. The suitable reaction that will convert benzene to toluene is

    • (a) Aldol condensation
    • (b) Hydrogenation and addition
    • (c) Friedel Crafts alkylation
    • (d) Friedel Crafts acylation followed by reduction
    उत्तर देखें

    उत्तर: (c)

80. 80. The temperature which has same numerical value on Celsius and Fahrenheit scale is

    • (a) 273
    • (b) – 40
    • (c) – 273
    • (d) 40
    उत्तर देखें

    उत्तर: (b)

81. 81. If the nuclei of masses x and y fused together to form a nucleus of mass m, then

    • (a) x + y = m
    • (b) x + y > m
    • (c) x + y < m
    • (d) m + x = y
    उत्तर देखें

    उत्तर: (b)

82. 82. Leclanche cell and Daniel cell are examples of

    • (a) both dry cell
    • (b) both wet cell
    • (c) dry cell, wet cell
    • (d) wet cell, dry cell
    उत्तर देखें

    उत्तर: —

83. 83. According to Dalton, atoms of a given element are

    • (a) Identical mass, size and shape.
    • (b) Identical mass, size and different shape.
    • (c) Identical mass but different size and shape.
    • (d) Identical size and shape but different mass.
    उत्तर देखें

    उत्तर: (a)

84. 84. Oxygen molecule exhibits

    • (a) Diamagnetism
    • (b) Paramagnetism
    • (c) Ferromagnetism
    • (d) Antiferromagnetism
    उत्तर देखें

    उत्तर: (b)

85. 85. If A and B are non-zero vectors which obey the relation |A + B| = |A – B|, then the angle between them is

    • (a) 0°
    • (b) 60°
    • (c) 90°
    • (d) 120°
    उत्तर देखें

    उत्तर: (c)

86. 86. Among the following one which exhibits ferromagnetism is

    • (a) Al
    • (b) Na
    • (c) Zn
    • (d) Co
    उत्तर देखें

    उत्तर: (d)

87. 87. An ideal material for making handle of cooking vessels must have

    • (a) large heat capacity and small conductivity
    • (b) small heat capacity and large conductivity
    • (c) small heat capacity and small conductivity
    • (d) large heat capacity and large conductivity
    उत्तर देखें

    उत्तर: (a)

88. 88. Which of the following is most acidic ?

    • (a) Monochloro acetic acid
    • (b) Dichloro acetic acid
    • (c) Trichloro acetic acid
    • (d) Acetic acid
    उत्तर देखें

    उत्तर: (c)

89. 89. The work function of sodium is 2.3 eV. What will be the maximum kinetic energy of the photoelectrons emitted by the surface exposed to the radiation of 2000 Å ?

    • (a) 2.3 eV
    • (b) 3.9 eV
    • (c) 6.2 eV
    • (d) 3.9 V
    उत्तर देखें

    उत्तर: (b)

90. 90. When a cation is formed from a neutral atom, the atomic size

    • (a) Remains same
    • (b) Decreases
    • (c) Increases
    • (d) Either increases or decreases
    उत्तर देखें

    उत्तर: (b)

91. 91. Which of the following will exhibit geometric isomerism ?

    • (a) Styrene
    • (b) Cinnamic acid
    • (c) Lactic acid
    • (d) All of the above
    उत्तर देखें

    उत्तर: (b)

92. 92. On a new scale of temperature called W scale, the freezing and boiling points of water are 39°W and 239°W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39°C ?

    • (a) 200°W
    • (b) 139°W
    • (c) 78°W
    • (d) 117°W
    उत्तर देखें

    उत्तर: (d)

93. 93. At the end of the chemical reaction, the catalyst remains

    • (a) Unchanged in quantity but changed in composition
    • (b) Unchanged in quantity and composition
    • (c) Unchanged in composition but changed in quantity
    • (d) Changed in quantity and composition
    उत्तर देखें

    उत्तर: (b)

94. 94. Which of the following will not react with hydroxyl ions by nucleophilic attack ?

    • (a) Diethyl ether
    • (b) Ethyl acetate
    • (c) Acetamide
    • (d) Acetonitrile
    उत्तर देखें

    उत्तर: (a)

95. 95. A polished metal plate has rough and black spot. It is heated to 1400 K and brought immediately in dark room. Then

    • (a) The spot will appear darker than the plate
    • (b) The spot will appear equally bright
    • (c) The spot will appear darker and brighter than the plate periodically
    • (d) The spot will appear brighter than the plate
    उत्तर देखें

    उत्तर: (d)

96. 96. Which is not a characteristic reaction of benzene ?

    • (a) Addition
    • (b) Electrophilic substitution
    • (c) Elimination
    • (d) Nucleophilic substitution
    उत्तर देखें

    उत्तर: (c)

97. 97. Choose the correct statement.

    • (a) α rays have high ionization power.
    • (b) Isotopes are always radioactive.
    • (c) β rays are deflected towards cathode when the electric field is applied.
    • (d) Gamma rays are negatively charged particles.
    उत्तर देखें

    उत्तर: (a)

98. 98. The more reactive member in halogen is

    • (a) Chlorine
    • (b) Fluorine
    • (c) Iodine
    • (d) Bromine
    उत्तर देखें

    उत्तर: (b)

99. 99. A women in a car on a level road sees an airplane travelling in the same direction that is climbing at an angle of 30° above the horizontal. By driving at 110 km/h she is able to stay directly below the airplane. The airplane’s velocity is

    • (a) 127 km/h
    • (b) 110 km/h
    • (c) 220 km/h
    • (d) 144 km/h
    उत्तर देखें

    उत्तर: (a)

100. 100. Sulphur exhibit variable Valency due to

     • (a) Bigger size
     • (b) High electronegativity
     • (c) Presence of d orbital in sulphur
     • (d) High ionization energy
     उत्तर देखें

     उत्तर: (c)

101. 101. A transformer has 300 turns in its primary coil and 75 turns in its secondary coil. When the current in the secondary coil is 20 A, the current in the primary coil is

     • (a) 5 A
     • (b) 25 A
     • (c) 80 A
     • (d) 6.4 kA
     उत्तर देखें

     उत्तर: (a)

102. 102. Which of the following CH₃ – X bond has the highest polarity ?

     • (a) C – Br
     • (b) C – F
     • (c) C – Cl
     • (d) C – I
     उत्तर देखें

     उत्तर: (b)

103. 103. The negative electrode in lead acid battery is

     • (a) Iron
     • (b) Lead
     • (c) Silver
     • (d) Carbon
     उत्तर देखें

     उत्तर: (b)

104. 104. A metal ball with the momentum mv strikes a wall and bounces back. The change in the ball’s momentum is ideally

     • (a) 0
     • (b) mv
     • (c) 2mv
     • (d) – 2mv
     उत्तर देखें

     उत्तर: (d)

105. 105. Which of the following substrates will give free radicals under appropriate conditions ?

     • (a) Alcohols
     • (b) Alkyl halides
     • (c) Alkenes
     • (d) All of the above
     उत्तर देखें

     उत्तर: (d)

106. 106. A 10 kW drilling machine is used to drill a bore in a small aluminium block of mass 8 kg. Find the rise in temperature of the block in 2.5 minutes, assuming 50% power is used up in the heating machine itself or lost to the surroundings. (Specific heat of aluminium = 0.91 J g⁻¹°C⁻¹)

     • (a) 103°C
     • (b) 150°C
     • (c) 206°C
     • (d) 155°C
     उत्तर देखें

     उत्तर: (a)

107. 107. An object’s temperature is raised by 150°C. The resulting increase in its absolute temperature is

     • (a) 32 K
     • (b) 150 K
     • (c) 180 K
     • (d) 373 K
     उत्तर देखें

     उत्तर: (b)

108. 108. The catalyst used in the manufacture of methyl alcohol from water gas is

     • (a) ZnO + MnO₂
     • (b) Cr₂O₃ + MgO
     • (c) ZnO + Cr₂O₃
     • (d) CaO + CrO₃
     उत्तर देखें

     उत्तर: (c)

109. 109. Ionic compounds dissolve in

     • (a) Polar solvents
     • (b) Non-polar solvents
     • (c) Organic solvents
     • (d) Non-aqueous
     उत्तर देखें

     उत्तर: (a)

110. 110. A body is released from the top of the tower of height h metre. It takes T seconds to reach the ground. Where was the body at time T/2 seconds ?

     • (a) at h/2 m from the ground
     • (b) at h/4 m from the ground
     • (c) at 3h/4 m from the ground
     • (d) depends upon the mass and volume of the body
     उत्तर देखें

     उत्तर: (c)

111. 111. In the case of p – n junction, diode at high value of reverse bias, the current rises sharply. The value of reverse voltage is known as

     • (a) Cut in voltage
     • (b) Break-down voltage
     • (c) Cut off voltage
     • (d) Inverse voltage
     उत्तर देखें

     उत्तर: (b)

112. 112. IUPAC name of the following compound is

     • (a) 1-ethoxy-2-nitrocyclohexane
     • (b) 2-ethoxy-1-nitrocyclohexane
     • (c) 1-ethoxy-2-nitrocyclohexene
     • (d) 2-ethoxy-1-nitrocyclohexene
     उत्तर देखें

     उत्तर: (a)

113. 113. A body cools from 61°C to 59°C in 4 minutes and from 51°C to 49°C in 6 minutes, then temperature of the room is

     • (a) 30°C
     • (b) 25°C
     • (c) 35°C
     • (d) 20°C
     उत्तर देखें

     उत्तर: (a)

114. 114. A wooden wagon wheel has an outside diameter of 3750 mm. The iron tire for this wheel is deliberately made smaller so that it can be shrunk in place to be a tight fit. If the tire’s inside diameter is 3737 mm at 20°C, the temperature to which it must be heated to fit over the wheel ? The coefficient of linear expansion of the steel is 1.2 × 10⁻⁵ /°C.

     • (a) 290°C
     • (b) 20°C
     • (c) 310°C
     • (d) 270°C
     उत्तर देखें

     उत्तर: (c)

115. 115. The radii of two planets are respectively R₁ and R₂ and their densities are respectively ρ₁ and ρ₂. The ratio of the acceleration due to gravity (g₁/g₂) at their surface is

     • (a) ρ₁R₂² / ρ₂R₁²
     • (b) R₁ρ₁ / R₂ρ₂
     • (c) R₁ρ₂ / R₂ρ₁
     • (d) R₁R₂ / ρ₁ρ₂
     उत्तर देखें

     उत्तर: (b)

116. 116. The lightest metal in the periodic table is

     • (a) Li
     • (b) Sn
     • (c) He
     • (d) H
     उत्तर देखें

     उत्तर: (a)

117. 117. A satellite orbits the earth in a circle of radius 8000 km. At that distance from the earth, the velocity of the satellite is (g = 6.2 m/s²)

     • (a) 0.90 km/s
     • (b) 7.0 km/s
     • (c) 8.9 km/s
     • (d) 0.7 km/s
     उत्तर देखें

     उत्तर: (b)

118. 118. Which of the following compounds undergo inversion in their configuration ?

     • (a) Methane
     • (b) Ethane
     • (c) Ammonia
     • (d) Acetaldehyde
     उत्तर देखें

     उत्तर: (c)

119. 119. The hybridization of oxygen in water is

     • (a) sp³
     • (b) sp²
     • (c) sp
     • (d) sp²d
     उत्तर देखें

     उत्तर: (a)

120. 120. A convex mirror forms an enlarged image of an object

     • (a) for no values of object distance
     • (b) when object distance is less than twice the focal length
     • (c) when object distance is more than twice the focal length
     • (d) for all values of object distance
     उत्तर देखें

     उत्तर: (a)

121. 121. The compound used in refrigeration is

     • (a) Nitrogen
     • (b) Liquid ammonia
     • (c) Liquid ammonium chloride
     • (d) Liquid fluorine
     उत्तर देखें

     उत्तर: (b)

122. 122. Two resistances 1 Ω and 4 Ω are connected in the left and right gaps of a Wheatstone’s meter bridge. The balancing length ‘l’ is noted. Now the resistances are interchanged in the two gaps. The new balancing length ‘L’ is noted. Then

     • (a) l/L = 1/4
     • (b) l = L
     • (c) L – l = 69 cm
     • (d) l – L = 60 cm
     उत्तर देखें

     उत्तर: (a)

123. 123. The correct order of electronegativity of the elements N, O, F and P is

     • (a) F > N > P > O
     • (b) F > O > P > N
     • (c) F > O > N > P
     • (d) N > O > F > P
     उत्तर देखें

     उत्तर: (c)

124. 124. A baseball is moving at 25 m/s. When it is struck by a bat moves off in the opposite direction at 35 m/s. If the impact lasted 0.010 s, find the baseball’s acceleration during the impact.

     • (a) 2500 m/s²
     • (b) – 6000 m/s²
     • (c) – 3500 m/s²
     • (d) 5000 m/s²
     उत्तर देखें

     उत्तर: (b)

125. 125. Nitration of benzoic acid gives following major product

     • (a) o-nitro benzoic acid
     • (b) m-nitro benzoic acid
     • (c) p-nitro benzoic acid
     • (d) all of the above
     उत्तर देखें

     उत्तर: (b)