Sets
Physics Set 20
30 questions 1. The Earth rotates on its axis from:
2. The liquids generally used in laboratory thermometers are:
3. If the absolute temperature of a perfect radiator is doubled, the energy radiated per unit time becomes ___ times.
4. The region of a sound wave where the density of the medium is lower than the average density is called:
5. The absolute refractive index of a medium is the ratio of the speed of light in vacuum to the:
6. The image formed by a convex mirror, for any position of the object, is always:
7. Consider the following pairs:
(I) Ammeter – connected in series
(II) Voltmeter – connected in parallel
(III) Ammeter – connected in parallel
Which of the pairs given above is/are correctly matched?
8. Which scientist argued, through thought experiments, that a body moving on a horizontal plane would move indefinitely if all impediments were removed?
9. A lever is balanced when:
10. Assertion (A): The motion of a simple pendulum is simple harmonic only for small angular displacements.
Reason (R): For small θ, sin θ can be approximated by θ in radians.
Choose the correct statement:
11. The sky appears dark to an astronaut at a very high altitude because:
12. The magnetic field inside a long current-carrying solenoid is:
13. The increase in the dimensions of a body due to a rise in its temperature is called:
14. Water flows at 2 m s⁻¹ through a pipe of cross-section 20 cm², which narrows to 5 cm². The speed in the narrow part is:
15. Ākāśha Gangā is the Indian name for the:
16. Consider the following pairs:
(I) Pendulum clock – Christiaan Huygens
(II) Accurate expression for time from the shadow of a vertical stick – Varahamihira
(III) Sinking-bowl water clock – Kautilya
Which of the pairs given above is/are correctly matched?
17. An object makes one revolution on a circle of radius R in time T. Its average speed is:
18. Calculations show that an electron in Rutherford's model would spiral into the nucleus in about:
19. A device draws a current of 1.5 A from a 220 V supply. Its power is:
20. Generation of heat in a conductor due to the flow of electric current is known as the: