Physics Test Bank
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Physics Test Bank
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25 Questions

1. The work done in deflecting a compass needle of magnetic moment M through an angle q from its equilibrium position is(H = horizontal component of the earth's magnetic field)
2. As seen from the earth, which planet appears the brightest at night?
3. Fish can survive inside a frozen lake because
4. The speed of a motor car changes from 18 km/hr to 72 km/ hr in five seconds. Its acceleration is
5. Pick out the vector quantity
6. A particle tied to a string of negligible weight and length l is swung in a horizontal circular path with constant angular velocity having time period T. If the string length is shortened by l/2, while the particle is in motion, the time period is
7. The wavelength used in radar is
8. A sphere of 200 g is tied to one end of a 130 cm long rope, whose second end is tied to the ceiling. The sphere is moves in a horizontal circle of 50 cm. The time period of conical pendulum will be
9. A transformer is used to
10. A temperature of 60°C is equal to
11. Ultrasound apparatus is based on ultrasonic waves. These waves are produced in ultrasound machine using
12. A unit for expressing astronomical distances
13. Tea will cool most easily in a
14. If the increase in the kinetic energy of a body is 22%, then the increase in the momentum is nearly
15. On sounding a tuning fork A with another tuning fork B of frequency 384 Hz, 6 beats are produced per second. After loading the prongs of A with some wax and then sounding it again with B, 4 beats are produced per second. What is the frequency of the tuning fork A?
16. Eight droplets of mercury having same charge and same radius get mixed to form a big drop. The capacity of big drop in comparison to small droplet is
17. In a step-up transformer, the turn ratio is 1 : 2. A Lechlanche cell (emf 1.5 V) is connected across the primary. The voltage across the secondary is
18. Two spheres P and Q of same colour having radii 8 cm and 2 cm are maintained at temperature 127°C and 527°C respectively. The ratio of energy radiated by P and Q is
19. A tube closed at one end and containing air produces, when excited the fundamental note of frequency, 512 Hz. If the tube is open at both ends, the fundamental frequency that can be excited (in Hz) is
20. A reference frame attached to the earth is
21. Two waves of same frequency and same amplitude on superposition produce a resultant wave of the same amplitude. The waves differ in phase by
22. When a capacitor is connected to a battery
23. The radius of the orbital of electon in the hydrogen atom is 0.5 Å .The speed of the electron is 2 × 106 ms'1. Then the current in the loop due to the motion of the electron is
24. If a machine is lubricated with oil, then
25. If two vectors A → and B → are perpendicular to each other, it follows that

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