UP TGT 2021 — Science (Series A)

Science

1. 1. If a neutral atom has 2K electrons, 8L electrons and 6M electrons, the total number of s-electrons, p-electrons and d-electrons separately in the atom will be

   • (a) 4, 6, 1
   • (b) 6, 8, 1
   • (c) 6, 10, 0
   • (d) 6, 10, 1
   उत्तर देखें

   उत्तर: (c)

2. 2. Which trihydride has most thermal stability?

   • (a) PH₃
   • (b) AsH₃
   • (c) NH₃
   • (d) SbH₃
   उत्तर देखें

   उत्तर: (c)

3. 3.

   • (a) decrease
   • (b) increase
   • (c) stay unchanged
   • (d) decrease or increase depending on surfaces of contact
   उत्तर देखें

   उत्तर: (a)

4. 4. Some postulates of atomic theory of matter are quoted below (A) The ultimate particles of a given pure substance, called atoms, are chemically alike. (B) Atoms can neither be created nor destroyed. (C) Atoms though chemically identical, differ slightly in their weights. (D) Chemical reactions do not change nature of atoms, but cause their rearrangement. One of the above postulates was not part of Dalton's atomic theory. Identify it.

   • (a) (A)
   • (b) (B)
   • (c) (C)
   • (d) (D)
   उत्तर देखें

   उत्तर: (c)

5. 5. Out of the following which compound does not show sp³ hybridization?

   • (a) CH₄
   • (b) BF₃
   • (c) NH₃
   • (d) H₂O
   उत्तर देखें

   उत्तर: (b)

6. 6.

   • (a) v decreases, ν unchanged, λ decreases
   • (b) v and ν unchanged, λ decreases
   • (c) v decreases, ν and λ unchanged
   • (d) v, ν, λ all remain unchanged
   उत्तर देखें

   उत्तर: (a)

7. 7. Which one of the following is not an element?

   • (a) Diamond
   • (b) Graphite
   • (c) Ozone
   • (d) Silica
   उत्तर देखें

   उत्तर: (d)

8. 8. Whose experiment showed that atoms have discrete energy levels?

   • (a) Davisson and Germer
   • (b) Franck and Hertz
   • (c) Planck
   • (d) Rutherford
   उत्तर देखें

   उत्तर: (b)

9. 9. Newton's Law of cooling is an approximate form of

   • (a) Wien displacement law
   • (b) Stefan's law
   • (c) Kirchoff's law
   • (d) Jean's law
   उत्तर देखें

   उत्तर: (b)

10. 10. Which of the following species can act as a Bronsted acid?

    • (a) (CH₃)₃C⁺
    • (b) CH₃C̄H₂
    • (c) CH₃ĊH₂
    • (d) C₅H₅⁻
    उत्तर देखें

    उत्तर: (a)

11. 11. In two-dimensional space, a particle A of mass 2 kg, velocity (3, 0) is moving along line x = 5, while particle B of mass 3 kg, velocity (−2, 0) is moving along line x = −3. What is the total angular momentum of the system?

    • (a) Zero
    • (b) 48 clockwise
    • (c) 12 anti clockwise
    • (d) Cannot be determined since axis of rotation not specified
    उत्तर देखें

    उत्तर: (b)

12. 12. An electric heater draws a current of 10 A when connected to 220 V output terminal. Its resistance is

    • (a) 44 Ω
    • (b) 33 Ω
    • (c) 22 Ω
    • (d) 11 Ω
    उत्तर देखें

    उत्तर: (c)

13. 13. The following element does not show positive oxidation number

    • (a) P
    • (b) S
    • (c) F
    • (d) Cl
    उत्तर देखें

    उत्तर: (c)

14. 14. If an object travels half its total path in the last second of its fall from rest, the height of its fall, is

    • (a) 20 m
    • (b) 42 m
    • (c) 57 m
    • (d) 67 m
    उत्तर देखें

    उत्तर: (c)

15. 15. If the atomic size increases, the non-metallic character will

    • (a) Increase
    • (b) Decrease
    • (c) Sometimes increases and sometimes decreases
    • (d) No change
    उत्तर देखें

    उत्तर: (b)

16. 16. The wavelength of the matter waves associated with a fast moving sub-atomic particle depends upon – (i) charge (ii) mass (iii) velocity (iv) spin state and (v) momentum. The correct factors are

    • (a) Only (iii)
    • (b) Only (i), (ii) and (iii)
    • (c) Only (ii), (iii) and (iv)
    • (d) Only (ii), (iii) and (v)
    उत्तर देखें

    उत्तर: (d)

17. 17. The temperature scale which is independent of the properties of any substance is the

    • (a) Celsius scale
    • (b) Reaumur scale
    • (c) Fahrenheit scale
    • (d) Kelvin scale
    उत्तर देखें

    उत्तर: (d)

18. 18. Which one of the following compound contain both ionic and covalent bond?

    • (a) Carbon tetrachloride
    • (b) Calcium chloride
    • (c) Ammonium chloride
    • (d) Water
    उत्तर देखें

    उत्तर: (c)

19. 19. Arrange the following according to decreasing order of bond angles.

    • (a) H₂S > H₂Se > H₂Te > H₂O
    • (b) H₂O > H₂S > H₂Se > H₂Te
    • (c) H₂Te > H₂O > H₂S > H₂Se
    • (d) H₂Se > H₂S > H₂O > H₂Te
    उत्तर देखें

    उत्तर: (b)

20. 20. The earth has mass M and radius R. If 'g' is acceleration due to gravity on the surface of the earth, what is its value at height R/3 above the earth's surface?

    • (a) (9/16) g
    • (b) (4/9) g
    • (c) g/3
    • (d) zero
    उत्तर देखें

    उत्तर: (a)

21. 21. Ethylbromide on treatment with silver cyanide gives

    • (a) CH₃—CH₂—CN
    • (b) CH₂=CH₂
    • (c) CH₃—CH₂—N≡C
    • (d) H—C≡C—H
    उत्तर देखें

    उत्तर: (c)

22. 22. According to VSEPR theory, the repulsive interaction of electron pairs decrease in the order

    • (a) Lone pair – Bond pair > Bond pair – Bond pair > Lone pair – Lone pair
    • (b) Lone pair – Lone pair > Lone pair – Bond pair > Bond pair – Bond pair
    • (c) Bond pair – Bond pair > Lone pair – Lone pair > Lone pair – Bond pair
    • (d) Lone pair – Lone pair > Bond pair – Bond pair > Lone pair – Bond pair
    उत्तर देखें

    उत्तर: (b)

23. 23.

    • (a) 2 m
    • (b) 1 m
    • (c) 0.5 m
    • (d) 0.25 m
    उत्तर देखें

    उत्तर: (b)

24. 24. What will be the mass of 3.2 gram atoms of oxygen?

    • (a) 10.24 gram
    • (b) 102.4 gram
    • (c) 1.024 gram
    • (d) 1024 gram
    उत्तर देखें

    उत्तर: —

25. 25. AC, voltage 100 V, 50 Hz is applied to the ends of a choke of L = 2 Henry. What current will flow through it (in amperes)?

    • (a) 1/(2π) A.C.
    • (b) 1/(2π) D.C.
    • (c) 2/π A.C.
    • (d) 2/π D.C.
    उत्तर देखें

    उत्तर: (a)

26. 26. Two identical spheres A and B are at temperature 7°C and 17°C respectively. In what ratio will they emit thermal radiation?

    • (a) 1 : 1.143
    • (b) 7 : 17
    • (c) 49 : 289
    • (d) 7⁴ : 17⁴
    उत्तर देखें

    उत्तर: (a)

27. 27. In each of the ions given below, the charge bearing carbon atom makes a σ-bond with the other carbon atom. In such a bond formation, it utilizes a hybrid orbital which bears maximum s-character in case of

    • (a) CH₃—C̄H₂
    • (b) CH₃—C⁺H₂
    • (c) H₂C=C̄H
    • (d) HC≡C̄
    उत्तर देखें

    उत्तर: (d)

28. 28. Given the equation → Angular Momentum = (αβ − γ/time) × velocity, which of the following are possible dimensions of α, β and γ?

    • (a) M, L, T
    • (b) M, L, MLT
    • (c) ML, ML, MLT
    • (d) M²L⁻², ML, T
    उत्तर देखें

    उत्तर: (b)

29. 29. In the potentiometer circuit shown, an e.m.f. E is balanced at C, 40 cm from the end B of the wire AB, which has a length of 100 cm and a resistance of 4 Ω. If the potential difference across the resistor R of 200 Ω is 1.00 V, the e.m.f. E in mV is

    • (a) 12
    • (b) 10
    • (c) 8
    • (d) 6
    उत्तर देखें

    उत्तर: (a)

30. 30. The ratio of specific charge of a proton and a α-particle is

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

    उत्तर: (a)

31. 31. All the four quantum numbers of last electron of sodium atom are

    • (a) n = 3, l = 0, m = 0, s = +1/2
    • (b) n = 3, l = 1, m = +1, s = +1/2
    • (c) n = 3, l = 2, m = +1, s = +1/2
    • (d) n = 2, l = 0, m = 0, s = +1/2
    उत्तर देखें

    उत्तर: (a)

32. 32. Which of these can be the fuel in a nuclear fission reactor?

    • (a) Cadmium
    • (b) Thorium
    • (c) Helium
    • (d) Deuterium
    उत्तर देखें

    उत्तर: (b)

33. 33. The electronegativity of the atom would increase with increase in ____ character of its hybrid orbitals.

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

    उत्तर: (d)

34. 34. Arrange the following according to penetrating power of the rays.

    • (a) β > α > γ
    • (b) γ > β > α
    • (c) α > γ > β
    • (d) α > β > γ
    उत्तर देखें

    उत्तर: (b)

35. 35. Kepler's law of "Areal Velocity is constant" is equivalent to law of conservation of

    • (a) Mass
    • (b) Energy
    • (c) Linear Momentum
    • (d) Angular Momentum
    उत्तर देखें

    उत्तर: (d)

36. 36. Who postulated that the momentum of an electron in an atom is quantized?

    • (a) Erwin Schrodinger
    • (b) Niels Henrik David Bohr
    • (c) Louis Victor Pierre Raymond Duc de Broglie
    • (d) Wolfgang Pauli
    उत्तर देखें

    उत्तर: (b)

37. 37. Identify the product of the following reaction.

    • (a)
    • (b)
    • (c)
    • (d)
    उत्तर देखें

    उत्तर: (c)

38. 38. Two plane mirrors are placed at 60° angle to each other. How many images will be seen if the object is placed between them?

    • (a) 2
    • (b) 3
    • (c) 5
    • (d) Infinite
    उत्तर देखें

    उत्तर: (c)

39. 39. Who made the observation that there must be very large empty space within the atom?

    • (a) Einstein
    • (b) Arrhenius
    • (c) Chadwick
    • (d) Rutherford
    उत्तर देखें

    उत्तर: (d)

40. 40. An ideal transformer has 100 turns in primary and N turns in secondary. If the input is 220 V A.C. and we want 11 V output, what is the value of N?

    • (a) 1
    • (b) 5
    • (c) 100
    • (d) 500
    उत्तर देखें

    उत्तर: (b)

41. 41. If the refractive index of glass is 1.5, the speed of light in glass is

    • (a) 2.3 × 10⁸ m/s
    • (b) 3.0 × 10⁸ m/s
    • (c) 1.5 × 10⁸ m/s
    • (d) 2.0 × 10⁸ m/s
    उत्तर देखें

    उत्तर: (d)

42. 42. Which gas is evolved when water is added to calcium carbide at room temperature?

    • (a) Hydrogen
    • (b) Methane
    • (c) Acetylene
    • (d) Allene
    उत्तर देखें

    उत्तर: (c)

43. 43. Rain is falling vertically on the ground at speed 5√3 m/s. If a man walks towards the East with speed 5 m/s, he will feel the rain falling at what angle to the vertical?

    • (a) 0°
    • (b) 30°
    • (c) 45°
    • (d) 60°
    उत्तर देखें

    उत्तर: (b)

44. 44. Transmission of heat by molecular collision is

    • (a) Conduction
    • (b) Convection
    • (c) Radiation
    • (d) Scattering
    उत्तर देखें

    उत्तर: (a)

45. 45. If the standard electrode potentials for zinc and copper electrodes in the cell Zn|Zn²⁺||Cu²⁺|Cu are − 0.76 V and 0.34 V respectively, the value of standard potential of the cell in volts will be

    • (a) 0.11
    • (b) 11.0
    • (c) 1.10
    • (d) 0.011
    उत्तर देखें

    उत्तर: (c)

46. 46. The temperature at which the vapour pressure of a liquid becomes equal to atmospheric pressure is called

    • (a) Melting point
    • (b) Freezing point
    • (c) Critical temperature
    • (d) Boiling point
    उत्तर देखें

    उत्तर: (d)

47. 47. The resistances in a post office box are made of

    • (a) Copper
    • (b) Iron
    • (c) Manganin
    • (d) Brass
    उत्तर देखें

    उत्तर: (c)

48. 48. Choose the correct statement.

    • (a) Oxidation state of central atom is +5 in HClO and +1 in HClO₃.
    • (b) The chlorine atom will be more electronegative in HClO₃ than in HClO.
    • (c) The chlorine atom will be more electronegative in HClO than in HClO₃.
    • (d) The chlorine atom have equal electronegativity in both HClO and HClO₃.
    उत्तर देखें

    उत्तर: (b)

49. 49. Which has maximum spin multiplicity?

    • (a) p¹
    • (b) p²
    • (c) p³
    • (d) p⁴
    उत्तर देखें

    उत्तर: (c)

50. 50.

    • (a) Zero
    • (b) − GM/R
    • (c) − 3GM/8R
    • (d) − 3GM/2R
    उत्तर देखें

    उत्तर: (c)

51. 51. Among the chemical reactions given below, identify the double decomposition reaction.

    • (a) 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
    • (b) 4Fe + 3O₂ → 2Fe₂O₃
    • (c) H₂CO₃ → CO₂ + H₂O
    • (d) CuSO₄ + Fe → FeSO₄ + Cu
    उत्तर देखें

    उत्तर: —

52. 52. Find out the meta directing group from the following.

    • (a) −Cl
    • (b) −NH₂
    • (c) −CH₃
    • (d) −CN
    उत्तर देखें

    उत्तर: (d)

53. 53. Which mirror is best suited to focus parallel rays at a point?

    • (a) Spherical convex
    • (b) Spherical concave
    • (c) Hyperbolic
    • (d) Parabolic
    उत्तर देखें

    उत्तर: (d)

54. 54. Na⁺ and F⁻, both the ions have 1s², 2s² 2p⁶ electronic configuration, but ionic radius of Na⁺ ion is only 0.691 times that of F⁻ ion. If sum of their ionic radii is 231 pm, the ionic radius of F⁻ ion will be

    • (a) 136 pm
    • (b) 115 pm
    • (c) 95 pm
    • (d) 41 pm
    उत्तर देखें

    उत्तर: (a)

55. 55. Specific heat at constant pressure is Cₚ and at constant volume is Cᵥ. Why is the ratio Cₚ/Cᵥ greater than one?

    • (a) For constant pressure external work has to be done
    • (b) Cₚ includes rotational energy
    • (c) Cₚ includes vibrational energy
    • (d) Cₚ/Cᵥ > 1 only for ideal gases, not for real ones
    उत्तर देखें

    उत्तर: (a)

56. 56. For an adiabatic process the first law of thermodynamics becomes

    • (a) dU = dQ − dW
    • (b) dU = dQ
    • (c) dU = −dW
    • (d) dU = dW
    उत्तर देखें

    उत्तर: (c)

57. 57. The following d-block element does not show variable valency

    • (a) Cu
    • (b) Zn
    • (c) Mn
    • (d) Fe
    उत्तर देखें

    उत्तर: (b)

58. 58. If Force (F), velocity (V) and time (T) are taken as the fundamental dimensions, instead of mass, length and time, what will be dimensions of linear momentum (P)?

    • (a) FVT⁻¹
    • (b) FT
    • (c) FT⁻¹
    • (d) VT⁻²
    उत्तर देखें

    उत्तर: (b)

59. 59. The maximum acceleration of a SHM is α and the maximum velocity is β. What is the amplitude of oscillations?

    • (a) β²/α
    • (b) α/β²
    • (c) β/α
    • (d) α/β
    उत्तर देखें

    उत्तर: (a)

60. 60. Why usually covalent compounds have low melting and boiling points?

    • (a) Strong van der Waal's force
    • (b) Weak van der Waal's force
    • (c) No van der Waal's force
    • (d) Strong magnetic force
    उत्तर देखें

    उत्तर: (b)

61. 61. Which of the following is incorrect statement?

    • (a) Bohr's model of atom fails to explain spectra of multielectron atoms.
    • (b) Bohr's atomic model fails to explain Zeeman effect.
    • (c) Bohr's atomic model fails to explain Stark effect.
    • (d) Bohr's atomic model treats electron as a particle and as a wave.
    उत्तर देखें

    उत्तर: (d)

62. 62. When a p-n junction is reverse biased, its depletion region

    • (a) becomes wider
    • (b) becomes narrower
    • (c) disappears
    • (d) does not change
    उत्तर देखें

    उत्तर: (a)

63. 63. Which one is optically active?

    • (a) Propanoic acid
    • (b) 3-chloropropanoic acid
    • (c) 2-chloropropanoic acid
    • (d) 3-chloropropene
    उत्तर देखें

    उत्तर: (c)

64. 64. Out of the following set of compounds which set has bond order +1?

    • (a) F₂ and O₂²⁻
    • (b) N₂ and CO
    • (c) F₂ and NO⁺
    • (d) O₂²⁻ and N₂
    उत्तर देखें

    उत्तर: (a)

65. 65. Which property of light shows it is a transverse wave?

    • (a) Refraction
    • (b) Interference
    • (c) Diffraction
    • (d) Polarization
    उत्तर देखें

    उत्तर: (d)

66. 66. Which one of the following is a permanent effect?

    • (a) Inductive effect
    • (b) Electromeric effect
    • (c) Resonance effect
    • (d) Baker Nathan effect
    उत्तर देखें

    उत्तर: —

67. 67.

    • (a) Drift speed only
    • (b) Resistivity only
    • (c) Resistance only
    • (d) All of the above
    उत्तर देखें

    उत्तर: (d)

68. 68. [Latent heat of ice = 80 cals/gm]

    • (a) 0°C
    • (b) (50/3)°C
    • (c) 12.5°C
    • (d) 25°C
    उत्तर देखें

    उत्तर: (a)

69. 69. There are ____ number of ions in CoCl₃.5NH₃.

    • (a) 4
    • (b) 3
    • (c) 2
    • (d) 5
    उत्तर देखें

    उत्तर: (b)

70. 70. Two forces F⃗ and − 3F⃗ act at a perpendicular distance 'd' from each other. This is equivalent to which one of the following?

    • (a) Net linear force − 2F⃗ only
    • (b) Net linear force zero only
    • (c) A net couple of moment 2Fd only
    • (d) A net linear force of − 2F⃗ and a net couple of moment Fd
    उत्तर देखें

    उत्तर: (d)

71. 71.

    • (a) 59°C
    • (b) 62.1°C
    • (c) 56.05°C
    • (d) 60°C
    उत्तर देखें

    उत्तर: (d)

72. 72. The dilute solution of all the alkali metals in anhydrous liquid ammonia is

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

    उत्तर: (b)

73. 73. Which shows inert pair effect?

    • (a) Na
    • (b) Mg
    • (c) Pb
    • (d) Sc
    उत्तर देखें

    उत्तर: (c)

74. 74. Given four forces (i) Gravitational (ii) Electrostatic (iii) Magnetic (iv) Frictional Which of these are non-conservative?

    • (a) All
    • (b) Only Electrostatic
    • (c) Only Magnetic
    • (d) Both Magnetic and Frictional
    उत्तर देखें

    उत्तर: (d)

75. 75. An automobile fitted with a lead storage battery sometimes has starting trouble in cold climate. The low power output in such a case is due to

    • (a) Poor ionization of the electrolyte in it
    • (b) Mobility of the ions in the electrolyte is reduced significantly
    • (c) Specific gravity of sulfuric acid is increased
    • (d) Specific gravity of sulfuric acid falls
    उत्तर देखें

    उत्तर: (b)

76. 76.

    • (a) velocity 9.8 m/s
    • (b) velocity 4.9 m/s
    • (c) acceleration 9.8 m/s²
    • (d) acceleration 4.9 m/s²
    उत्तर देखें

    उत्तर: (c)

77. 77. The first law of thermodynamics is equivalent to the principle of conservation of

    • (a) energy
    • (b) temperature
    • (c) heat
    • (d) volume
    उत्तर देखें

    उत्तर: (a)

78. 78. (σ = 5.67 × 10⁻⁸ W/m²K⁴)

    • (a) 231 W
    • (b) 462 W
    • (c) 923 W
    • (d) 1050 W
    उत्तर देखें

    उत्तर: (c)

79. 79. In which of the compounds given below, bonding among atoms is explained on the basis of ionic, covalent as well as coordinate covalent bonds?

    • (a) Sodium carbonate
    • (b) Barium chloride
    • (c) Nitric acid
    • (d) Ammonia
    उत्तर देखें

    उत्तर: (c)

80. 80. In a pure semiconductor

    • (a) holes and electrons have equal mobility
    • (b) holes have higher mobility
    • (c) electrons have higher mobility
    • (d) only electrons are mobile
    उत्तर देखें

    उत्तर: (c)

81. 81.

    • (a) 0
    • (b) 1/4
    • (c) 15/16
    • (d) 1
    उत्तर देखें

    उत्तर: (d)

82. 82. Among the halides of silver, the one with lowest solubility in water is

    • (a) AgF
    • (b) AgCl
    • (c) AgBr
    • (d) AgI
    उत्तर देखें

    उत्तर: (d)

83. 83. If one molecule of hydrogen gas reacts with one molecule of chlorine gas to produce two molecules of hydrochloric acid, the number of molecules present in equal volumes of different gases at identical pressure and temperature will be

    • (a) Different
    • (b) Same
    • (c) Volume of H₂ is greater than O₂
    • (d) Volume of H₂ is less than O₂
    उत्तर देखें

    उत्तर: (b)

84. 84.

    • (a) in less than 10 seconds
    • (b) at exactly 10 seconds
    • (c) only after 10 seconds
    • (d) cannot be predicted
    उत्तर देखें

    उत्तर: (d)

85. 85. Identify the name of the following reaction. CH₃Br + 2Na + BrCH₃ —(Dry Et₂O)→ C₂H₆ + 2NaBr

    • (a) Kolbe's reaction
    • (b) Hydrogenation reaction
    • (c) Wurtz reaction
    • (d) Corey-House reaction
    उत्तर देखें

    उत्तर: (c)

86. 86. Which one is electrophile reagent?

    • (a) ⁻OH
    • (b) R − NH₂
    • (c) AlCl₃
    • (d) Cl⁻
    उत्तर देखें

    उत्तर: (c)

87. 87. Which defect of vision is corrected using cylindrical lenses in spectacles?

    • (a) Myopia
    • (b) Hypermetropia
    • (c) Astigmatism
    • (d) Loss of accommodation
    उत्तर देखें

    उत्तर: (c)

88. 88. According to the Planck's law the energy density of radiation in thermal equilibrium with matter at temperature T is given by u(ν, T) = (8πh/c³) · νⁿ/(e^(hν/kT) − 1), where 'n' is an integer equal to

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

    उत्तर: (d)

89. 89. Carbon atoms in graphite have their electrons neither in pure s- nor in pure p-orbitals but contain these in the orbitals that have

    • (a) 50% s- and 50% p-orbital character
    • (b) 33% s- and 66% p-orbital character
    • (c) 75% s- and 25% p-orbital character
    • (d) 25% s- and 75% p-orbital character
    उत्तर देखें

    उत्तर: (b)

90. 90. The mechanical equivalent of heat

    • (a) has same dimension as work
    • (b) has same dimension as heat
    • (c) has same dimension as rate of doing work
    • (d) dimensionless
    उत्तर देखें

    उत्तर: (d)

91. 91. In the circuit below, battery B has electro motive force 2 V and internal resistance 0.5 Ω. What should be the value of Resistance R for current I to be maximum?

    • (a) Infinite
    • (b) 1 Ω
    • (c) 0.5 Ω
    • (d) Zero
    उत्तर देखें

    उत्तर: (d)

92. 92. Which among the following is a pair of isotones?

    • (a) ²³₁₁Na, ²³₁₂Mg
    • (b) ²³₁₁Na, ²⁴₁₂Mg
    • (c) ²⁴₁₁Na, ²⁴₁₂Mg
    • (d) ²⁴₁₁Na, ²³₁₂Mg
    उत्तर देखें

    उत्तर: (b)

93. 93. An electric heater of power 1000 W raises the temperature of 5 kg of a liquid from 25°C to 31°C in 2 minutes. What is heat capacity of the liquid?

    • (a) 4 × 10³ J/kg°C
    • (b) 2 × 10⁴ J/°C
    • (c) 1.2 × 10⁵ J
    • (d) 1 × 10⁴ J/°C
    उत्तर देखें

    उत्तर: (a)

94. 94. Three particles of masses 2, 3 and 4 units are placed at points (0, 0, 0), (1, 1, 0) and (0, 1, 1) respectively. What is the moment of inertia of the system about the z-axis?

    • (a) Zero
    • (b) 4
    • (c) 7
    • (d) 10
    उत्तर देखें

    उत्तर: (d)

95. 95. Which element was assigned Group III A in the Mendeleev's periodic table but is a member of Group-13 in the 18-group modern periodic table?

    • (a) Cu
    • (b) Al
    • (c) Zn
    • (d) Sn
    उत्तर देखें

    उत्तर: (b)

96. 96. What will be the value of gram atoms present in 2.3 grams of sodium?

    • (a) 0.02
    • (b) 0.01
    • (c) 0.1
    • (d) 0.03
    उत्तर देखें

    उत्तर: (c)

97. 97. When a nucleus emits a β-ray, what does not change?

    • (a) Sum of proton and neutron numbers
    • (b) Proton number
    • (c) Neutron number
    • (d) Total charge
    उत्तर देखें

    उत्तर: (a)

98. 98. Which compound does not show expanded octet?

    • (a) PF₆
    • (b) SF₆
    • (c) NO₂
    • (d) H₂SO₄
    उत्तर देखें

    उत्तर: (c)

99. 99. Which shows maximum oxidation number +7 in 3d series?

    • (a) Cr
    • (b) Mn
    • (c) Fe
    • (d) Co
    उत्तर देखें

    उत्तर: (b)

100. 100.

     • (a) 45°C
     • (b) 35°C
     • (c) 50°C
     • (d) 64.3°C
     उत्तर देखें

     उत्तर: (c)

101. 101. Electro motive force represents

     • (a) Force
     • (b) Work
     • (c) Energy per unit charge
     • (d) Momentum
     उत्तर देखें

     उत्तर: (c)

102. 102. Standard reduction potentials of the two electrodes Co²⁺/Co and Fe²⁺/Fe are − 0.28 V and − 0.44 V respectively. The EMF of the cell for which cell reaction is Co + Fe²⁺ → Co²⁺ + Fe will be

     • (a) − 0.16 V
     • (b) − 0.72 V
     • (c) + 0.72 V
     • (d) + 0.16 V
     उत्तर देखें

     उत्तर: (a)

103. 103. For which one of the following concave mirror is not used?

     • (a) Shaving glass
     • (b) Reflector in search lights
     • (c) Examination of internal parts of ear
     • (d) Rear-view mirror in cars
     उत्तर देखें

     उत्तर: (d)

104. 104.

     • (a) 5 Ω
     • (b) 2.5 Ω
     • (c) 1.25 Ω
     • (d) 1 Ω
     उत्तर देखें

     उत्तर: (c)

105. 105. The radio isotope ²¹²₈₃Bi decays with α- and β-emissions simultaneously to give the radioactive products X and Y. X and Y further decay to give an identical product Z. The common product Z is an isotope of

     • (a) ₈₁Tl
     • (b) ₈₂Pb
     • (c) ₈₃Bi
     • (d) ₈₄Po
     उत्तर देखें

     उत्तर: (b)

106. 106. Which element was discovered through the Fraunhofer lines in the solar radiation?

     • (a) Hydrogen
     • (b) Helium
     • (c) Lithium
     • (d) Uranium
     उत्तर देखें

     उत्तर: (b)

107. 107. "A given compound always contains exactly the same proportion of elements by weight". This statement belongs to the

     • (a) Law of conservation of mass
     • (b) Law of multiple proportions
     • (c) Law of creation of mass
     • (d) Law of definite proportions
     उत्तर देखें

     उत्तर: (d)

108. 108. Modern periodic table was given by the following

     • (a) Lother Meyer
     • (b) Moseley
     • (c) Mendeleef
     • (d) New Land
     उत्तर देखें

     उत्तर: (b)

109. 109.

     • (a) mR²t
     • (b) Ft
     • (c) FRt
     • (d) Ft/R
     उत्तर देखें

     उत्तर: (c)

110. 110. The refractive index of water aμw = 4/3 and refractive index of glass aμg = 3/2. A lens placed in air has focal length 10 cm. What will be its focal length if placed inside water?

     • (a) 10 cm
     • (b) 15 cm
     • (c) 20 cm
     • (d) 40 cm
     उत्तर देखें

     उत्तर: (d)

111. 111. Which among the oxides of transition elements listed below is not coloured?

     • (a) TiO₂
     • (b) Cr₂O₃
     • (c) MnO₂
     • (d) Fe₂O₃
     उत्तर देखें

     उत्तर: (a)

112. 112. What is the cause of nuclear fission?

     • (a) Centrifugal force
     • (b) Coulomb force
     • (c) Surface tension
     • (d) Viscous force
     उत्तर देखें

     उत्तर: (b)

113. 113.

     • (a) t½ = 0.6931/λ
     • (b) t½ = λ/0.6931
     • (c) t½ = 0.936/λ
     • (d) t½ = λ/0.936
     उत्तर देखें

     उत्तर: (a)

114. 114. Antibonding molecular orbital is formed by

     • (a) Additive overlapping of two atomic orbitals
     • (b) Subtractive overlapping of two atomic orbitals
     • (c) Only by additive overlapping of two p orbitals
     • (d) Only by subtractive overlapping of two s orbitals
     उत्तर देखें

     उत्तर: (b)

115. 115.

     • (a) Zero
     • (b) 5°
     • (c) 7.5°
     • (d) 15°
     उत्तर देखें

     उत्तर: (b)

116. 116. If the halides of calcium are arranged in the increasing order of their melting points, the correct sequence will be

     • (a) CaI₂ < CaBr₂ < CaCl₂ < CaF₂
     • (b) CaI₂ < CaBr₂ < CaF₂ < CaCl₂
     • (c) CaF₂ < CaCl₂ < CaBr₂ < CaI₂
     • (d) CaCl₂ < CaF₂ < CaBr₂ < CaI₂
     उत्तर देखें

     उत्तर: (a)

117. 117. An electron in an atom though revolves around the nucleus, the radius of its path is not constant but varies between a maximum and a minimum values. This suggestion was given by

     • (a) John Dalton
     • (b) Sir Ernest Rutherford
     • (c) Niels Henrik David Bohr
     • (d) Arnold Johannes Wilhelm Sommerfeld
     उत्तर देखें

     उत्तर: (d)

118. 118. (g = acceleration due to gravity)

     • (a) M(g + α)
     • (b) (M + μL)g
     • (c) (M + μL/2)(g + α)
     • (d) (M + μL/2)g
     उत्तर देखें

     उत्तर: (c)

119. 119.

     • (a) 750 m/s²
     • (b) 500 m/s²
     • (c) 300 m/s²
     • (d) 250 m/s²
     उत्तर देखें

     उत्तर: (a)

120. 120. Which one of the following acts as an anode in the Leclanche cell?

     • (a) Carbon rod
     • (b) Zinc rod
     • (c) Copper rod
     • (d) Aluminium rod
     उत्तर देखें

     उत्तर: (b)

121. 121. In which of the following pairs, compounds of the ion with lower oxidation state are more common and stable?

     • (a) Cuperous, Cuperic
     • (b) Ferrous, Ferric
     • (c) Thallous, Thallic
     • (d) Mercurous, Mercuric
     उत्तर देखें

     उत्तर: (c)

122. 122.

     • (a) 0.16 cm³
     • (b) 0.16 π cm³
     • (c) 0.32 π cm³
     • (d) 0.48 π cm³
     उत्तर देखें

     उत्तर: (d)

123. 123.

     • (a) F⃗ · d²r⃗/dt²
     • (b) r⃗ · dr⃗/dt
     • (c) r⃗ · d²r⃗/dt²
     • (d) None of the above
     उत्तर देखें

     उत्तर: (c)

124. 124. Which have maximum electron affinity?

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

     उत्तर: (b)

125. 125. The maximum number of electrons, that can be accommodated in an orbital is

     • (a) 2
     • (b) 6
     • (c) 10
     • (d) 14
     उत्तर देखें

     उत्तर: (a)