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Posted Date: 21 Apr 2009 Posted By: AJITH KUMAR M Member Level: Silver
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2007 Physics Question paper
1. When light wave suffers reflection at the interference from air to glass, the change in phase of the reflected wave is equal to
(a) 0
(b) p/4
(c) 2p
(d) p
2. Time of flight of a projectile projected up with a velocity of 10m/s at an angle 300 with the horizontal is (g=10 m/s2)
(a) 1/2 s
(b) 1 s
(c) 2 s
(d) 3s
3. A 200W and 100W bulbs both meant for operation at 220V are connected in parallel. Then the power consumed by them when 220V is applied will be
(a) 66W
(b) 33W
(c) 100W
(d) 300W
4. A body is having uniform circular motion. A quantity that which does not remain constant is
(a) angular velocity
(b) velocity
(c) speed
(d) kinetic energy
5. The unit of pressure in SI is
(a) Pascal
(b) Pounds per square inch
(c) Newton per cm2
(d) Watt
6. A ball is projected from the top of a tower at an angle 600 with the horizontal. What happens to the horizontal component of its velocity?
(a) increases continuously
(b) decreases continuously
(c) remains unchanged
(d) first decreases and then increases
7. The galaxy to which our solar system belongs is called
(a) milky way
(b) radio galaxy
(c) solar galaxy
(d) dwarf galaxy
8. A bomb of mass 9kg at rest explodes into two pieces of masses 3kg and 6kg. The velocity of mass 3kg is 16m/s. The KE of mass 6kg in joule is
(a) 96
(b) 192
(c) 384
(d) 768
9. The transfer ratio ß of a transistor is 50. The input resistance of the transistor when used in the common emitter configuration is 1KO. The peak value of the collector ac current for an input voltage 0.01V peak is
(a) 100 µA
(b) 0.01mA
(c) 500 µA
(d) 50 µA
10. If momentum of a body becomes 3 times, kinetic energy becomes
(a) 3 times
(b) 6 times
(c) 9 times
(d) 27 times
11. The unit of impulse in SI is
(a) Newton-second
(b) Dyne
(c) Pound force
(d) Watt
12. If g is the acceleration due to gravity on the earth, the acceleration due to gravity on the sun is
(a) 24 g
(b) 16 g
(c) 32 g
(d) 28 g
13. A cyclist is moving in a circular path with a uniform speed of 200 cm/s. The change in velocity after half revolution is
(a) zero
(b) 200 cm/s
(c) 4 m/s
(d) 300 cm/s
14. In a junction diode holes are due to
(a) proton (b) neutrons
(c) missing electrons
(d) extra electrons
15. Light of wave length 4000Å is incident on a metal plate whose work function is 2eV. The maximum kinetic energy of the emitted photo electrons would be
(a) 2eV
(b) 1.5eV
(c) 1.1eV
(d) 0.5eV
16. A particle initially at rest is having uniformly accelerated motion. Its velocity is plotted against displacement. The graph obtained will be
(a) a straight line
(b) a straight line with a negative slope
(c) a parabola
(d) an ellipse
17. 540g of ice at 00C is mixed with with 540g of water at 800C. The final temperature of the mixture is
(a) 00C
(b) 400C
(c) 800C
(d) more than 800C
18. The diameters of two planets are in the ratio of 4:1 and their mean densities in the ratio of 1:2. The acceleration due to gravity on the surface of two planets will be in the ratio
(a) 4:1
(b) 1:8
(c) 1:2
(d) 2:1
19. The unit of acceleration in SI is
(a) km/hr
(b) m/s2
(c) cm/s
(d) mph
20. A frame which is moving with constant angular velocity is
(a) Inertial frame
(b) Non inertial frame
(c) Frame of rest
(d) Newtonian frame
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