SMATEE TEST SERIES 3 PHYSICS

Name

1. In an isothermal change of an ideal gas. The change in heat energy 𝛥𝑄 is equal to

a) 0.5 ΔW
b) ΔW
c) 1.5 ΔW
d) 2 ΔW

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2. In an adiabatic process, the quantity which remains constant is

a) volume
b) pressure
c) temperature
d) total heat of the system

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3. In an adiabatic expansion of a gas,

a) heat is gained or lost.
b) heat is neither gained nor lost.
c) temperature is kept constant.
d) volume is kept constant.

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4. Indicator diagram is a graph between

a) 𝑃 and 𝑇
b) 𝑉 and 𝑇
c) P and V
d) None of the above

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5. The relation 𝑃𝑉=𝑅𝑇 can describe behaviour of a real gas at

a) high temperature and high density
b) high temperature and low density
c) low temperature and low density
d) low temperature and high density

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6. The absolute zero is the temperature, at which

a) all substance exist in solid state
b) water freezes
c) molecule motion ceases
d) none of these

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7. A gas behave as an ideal gas at

a) low pressure and high temperature
b) low pressure and low temperature
c) high pressure and high temperature
d) high pressure and low temperature

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8. The number of degree of freedom for a diatomic gas molecule is

a) 2
b) 3
c) 5
d) 6

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9. The degree of freedom of a triatomic gas is

a) 1
b) 2
c) 6
d) 8Deselect Answer

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10. The translation kinetic energy of gas molecule for one mole of the gas is equal to
Deselect Answer

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11. The combination of which of the following processes results in the formation of a rainbow?

a) Dispersion and Total Internal Reflection
b) Dispersion and Absorption
c) Refraction and Scattering
d) Dispersion and FocussingDeselect Answer

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12. Which of the following phenomenon is not explained by Huygen’s wave theory?

a) Diffraction
b) Interference
c) Polarisation
d) Photoelectric effectDeselect Answer

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13. The refractive index of glass is 1.5. Calculate the speed of light in glass. The speed of light in air is 3.0×10⁸ms⁻¹.

a) 0×10⁸ms⁻¹

b) 3.0×10⁸ms⁻¹

c) 4.0×10⁸ms⁻¹

d) 5.0×10⁸ms⁻¹

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14. Two lenses of power −15D and +5D are in contact with each other. The focal length of the combination is

a) −20cm
b) −10cm
c) +20cm
d) +10cm

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15. Two thin lenses of focal lengths f1 and f2 are in contact. The focal length of this combination is

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16. A real image is obtained at 30 cm from a convex lens of focal length 7.5 cm. Find the distance of the object from the lens.

a) -10

b) 10

c) -20

d) 20

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17. An object is placed at a distance of 10cm from a convex mirror of focal length 15cm. Calculate the magnification of the image?

a) 0.6
b) 0.5
c) 0.15
d) 0.3

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18. A thin prism of 2∘angle gives a deviation of 1∘. What is the value of refractive index of the material of the prism.

a) 0.5
b) 1.5
c) 2.5
d) 3.5

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19. A passenger in an aeroplane shall

a) never see a rainbow
b) may see a primary and a secondary rainbow as concentric circles
c) may see a primary and a secondary rainbow as concentric arcs
d) shall never see a secondary rainbow

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20. The phenomena involved in the reflected of radio waves by ionosphere is similar to.

a) reflection of light by a plane mirror
b) total internal reflection of light in air during a mirage
c) dispersion of light by water molecules during the formation of a rainbow
d) scattering of light by the particles of air

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