Basic GK Questions and Answers on Physics - set 07 - ObjectiveBooks

# G.K. Practice Test: Question Set - 07

1. The absorption of ink by blotting paper involves
(A) Viscosity of ink
(B) Capillary action phenomenon
(C) Diffusion of ink through the blotting
(D) Siphon action

2. Nuclear sizes are expressed in a unit named
(A) Fermi
(B) Angstrom
(C) Newton
(D) Tesla

3. Planets do not twinkle because
(A) They emit light of a constant intensity
(B) Their distance from the earth does not change with time
(C) They are very far away from the earth resulting in decrease in intensity of light
(D) They are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable

4. Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
(A) Pressure and Young's modules
(B) Planck's constant and Angular momentum
(C) Impulse and moment of force
(D) Force and rate of change of linear momentum

5. Sound of frequency below 20 Hz is called
(A) Audio sounds
(B) Infrasonic
(C) Ultrasonic
(D) Supersonics

6. On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
(A) Mercury is a metal
(B) Density of mercury is greater than that of water
(C) Cohesion of mercury is greater than its adhesion with glass
(D) Cohesion of water is greater than its adhesion with glass

7. Sound travels at the fastest speed in
(A) Steel
(B) Water
(C) Air
(D) Vacuum

8. Superconductors are substances which
(A) Conduct electricity at low temperature
(B) Offer high resistance to the flow of current
(C) Offer no resistance to the flow of electricity
(D) Conduct electricity at high temperatures

9. Radio telescopes are better than optical telescopes because
(A) They can detect faint galaxies which no optical telescope can
(B) They can work even in cloudy conditions
(C) They can work during the day and night
(D) All of the above

10. Mercury is commonly used as a thermometric fluid rather than water because
(A) Specific heat of mercury is less than water
(B) Specific heat of mercury is more than water
(C) Mercury has greater visibility than water
(D) Density of mercury is more than the water

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