A/L 2001 Physics MCQ - Questions 11 - 20

11. In the equation Vⁱ = ka^js, V represents the velocity, a represents the acceleration and s represents the displacement. k is a constant and i and j are integers. What should be the values of i and j in order to make the equation dimensionally correcct?
1. (1) 1, 1
2. (2) 1, 2
3. (3) 2, 1
4. (4) 2, 2
5. (5) 2, 3
6. Answer with explanation
12. A train travels along a straight track. Another train travels in the same direction behind the first at the same speed. The first train blows a whistle of frequency f_o. If the apparent frequency of the whistle heard by a stationary passenger sitting in the second train is f, then
1. (1) f  > f_o
2. (2) f  < f_o
3. (3) f  = f_o
4. (4) f  = 2f_o
5. (5) f  = 1/2 f_o
6. Answer with explanation
13. A 50 cm long hollow cylindrical tube open at both ends is placed in air. A sound source that produces pure tones is placed adjacent to one end of the tube. The frequency of the emitted sound is increased gradually starting from a low value. At a frequency of 320 Hz, the tube resonates. The speed of sound in air is
1. (1) 160 ms^-1
2. (2) 320 ms^-1
3. (3) 340 ms^-1
4. (4) 360 ms^-1
5. (5) 640 ms^-1
6. Answer with explanation
14.  The velocity of a sound in a gas at 27^oC is V. The temperature at which the velocity of sound in the gas becomes 2V is
1. (1) 54^oC
2. (2) 108^oC
3. (3) 600^oC
4. (4) 927^oC
5. (5) 1200^oC
6. Answer with explanation
15. A convex lens of focal length of 25 cm is kept in contact with a concave lens of focal length 10 cm. The power of the lens combination in diopters is
1. (1) 4
2. (2) 6
3. (3) 10
4. (4) 14
5. (5) 15
6. Answer with explanation
16. The viscous force acting on a sphere moving in a fluid is
1. (A) directly proportional to the velocity of the sphere
2. (B) directly proportional to the mass of sphere
3. (C) inversely proportional to the radius of the sphere
4. Of the above statements
5. 
   
6. (1) only (A) is true
7. (2) only (B) is true
8. (3) only (A) and (B) are true
9. (4) only (B) and (C) are true
10. (5) all (A), (B) and (C) are true
11. Answer with explanation
17. A monochromatic ray of light undergoes minimum deviation after passing through a prism. If the angle of deviation produced by one of the prism surfaces is 20^o, the angle of minimum deviation of the ray is
1. (1) 10^o
2. (2) 20^o
3. (3) 30^o
4. (4) 40^o
5. (5) 60^o
6. Answer with explanation
18. A person who is long sighted has near point at 50 cm. What spectacles are required for him to view objects comfortably at 25 cm?
1. (1) Converging lens of focal length 100 cm
2. (2) Diverging lens of focal length 100 cm
3. (3) Converging lens of focal length 50 cm
4. (4) Diverging lens of focal length 50 cm
5. (5) Converging lens of focal length 25 cm
6. Answer with explanation
19. An electric heater is used to raise the temperature of water from 20^oC to 30^oC and supply hot water at a rate of 1 Kg per minute. The minimum power of the heating element is (specific heat capacity of water = 4200 J kg^-1 oC^-1)
1. (1) 7 W
2. (2) 70 W
3. (3) 700 W
4. (4) 4200 W
5. (5) 8400 W
6. Answer with explanation
20. Relative humidity inside a closed chamber can be increased by
1. (A) adding water vapour to the chamber
2. (B) by decreasing the temperature inside the chamber
3. (C) by decreasing the volume of the chamber
4. Of the above statements
5. 
   
6. (1) only (A) is true
7. (2) only (B) is true
8. (3) only (A) and (B) are true
9. (4) only (B) and (C) are true
10. (5) all (A), (B) and (C) are true
11. Answer with explanation

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A/L 2001 Physics MCQs: 1 - 10 | 11 - 20 | 21 - 30 | 31 - 40 | 41 - 50 | 51 - 60