Physics problems
- 1. Siphon will fail to work if
Options- A. the densities of the liquid in the two vessels are equal
- B. the level of the liquid in the two vessels are at the same height
- C. both its limbs are of unequal length
- D. the temperature of the liquids in the two vessels are the same Discuss
Correct Answer: the level of the liquid in the two vessels are at the same height
- 2. Isotopes of an element contain
Options- A. the same number of protons but different number of neutrons
- B. the same number of neutrons but different number of protons
- C. equal number of protons and electrons
- D. equal number of nucleons Discuss
Correct Answer: the same number of protons but different number of neutrons
- 3. Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
Options- A. Water, iron and air
- B. Iron, air and water
- C. Air, water and iron
- D. Iron, water and air Discuss
Correct Answer: Air, water and iron
- 4. Intensity of sound has
Options- A. an object existence
- B. a subject existence
- C. no existence
- D. both subjective and objective existence Discuss
Correct Answer: an object existence
- 5. Light year is a unit of
Options- A. time
- B. distance
- C. light
- D. intensity of light Discuss
Correct Answer: distance
- 6. Light travels at the fastest speed in
Options- A. glass
- B. water
- C. hydrogen
- D. vacuum Discuss
Correct Answer: vacuum
- 7. It takes much longer to cook food in the hills than in the plains, because
Options- A. in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
- B. due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
- C. in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere
- D. in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking Discuss
Correct Answer: in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
- 8. On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
Options- A. metals have higher thermal capacity than plastics
- B. plastics have a lower density than metals
- C. metals are good conductor of heat
- D. plastics have a higher thermal conductivity than metals Discuss
Correct Answer: metals are good conductor of heat
- 9. ML2T-2 is the dimensional formula for
Options- A. moment of inertia
- B. pressure
- C. elasticity
- D. couple acting on a body Discuss
Correct Answer: couple acting on a body
- 10. Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
Options- A. Pressure and Young's modules
- B. Planck's constant and Angular momentum
- C. Impulse and moment of force
- D. Force and rate of change of linear momentum Discuss
Correct Answer: Impulse and moment of force
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