Physics Test Bank
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Physics Test Bank
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25 Questions

1. At what temperature, the molecules of nitrogen will have the same rms velocity as the molecules of oxygen at 127°C?
2. The figure below represents the observed intensity of X-rays emitted by an X-ray tube, as a function of wavelength. The sharp peaks A and B denote
3. The current passing through a coil of 5H is decreasing at the rate of 2 As'1. The emf developed in the coil is
4. Thousand small droplets of water each of radius r and charge q, make a big drop of spherical shape. The potential of big drop is times the potential of one small droplet
5. A car moves for half of its time at 80 kmh'1 and for rest half of time at 40 kmh'1. The total distance covered is 60 km. What is the average speed of the car?
6. While running over a horizontal level rod, the man holds the umbrella in the vertical direction. If he stops, then in order to protect himself from the rain, he should hold it
7. Which evidence requires that light be particular?
8. Which part of the sun is visible during total solar eclipse?
9. A hydrogen-filled balloon rises in air because
10. The element used in an electric filament is
11. The radioactive nucleus 7N13 decays to 6C13 through the emission of
12. A heavenly body that has enormous surface gravity and swallows any particle, or even light, that approaches it is called a
13. Natural radioactivity was discovered by
14. When ice melts in a beaker of water, the level of water in the beaker will
15. A resonant system has a fundamental frequency of 100 Hz. If the next higher frequency that gives a resonance are 300 Hz and 500 Hz, the system could be
16. A sample of ideal monoatomic gas is taken round the cycle ABCA as shown in the figure. The work done during the cycle is
17. Sound travels fastest in
18. When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because
19. How much heat is developed in a 210 Watt electric bulb in 5 min? (Mechanical equivalent of heat = 4.2 jcal'1)
20. An image of the sun is formed by a lens of focal length of 30 cm on the metal surface of aphotoelectric cell and a photoelectric current (I ) is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm. The photoelectric current in this case is
21. A convex lens has a focal length of 10 cm. An object of height 5 cm is placed at a distance of 20 cm from the lens. The size of the image is
22. If the kinetic energy of the moving particle is E, then the de Broglie wavelength is
23. A transformer is used to
24. If 10% of the current passes through a moving coil galvanometer of resistance 99 , then the shunt resistance will be
25. If a body of mass 200 g falls from a height 200 m and its total potential energy is converted into kinetic energy at the point of contact of the body with earth surface, then what is the decrease in potential energy of the body at the contact? (Take g = 10 ms'2)

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