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- Question
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
- Correct Answer
- Air, water and iron
- 1. 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
- 2. 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
- 3. Suitable impurities are added to a semiconductor depending on its use. This is done in order to
Options- A. increase its life
- B. enable it to withstand higher voltages
- C. increase its electrical conductivity
- D. increase its electrical resistivity Discuss
- 4. Mirage is due to
Options- A. unequal heating of different parts of the atmosphere
- B. magnetic disturbances in the atmosphere
- C. depletion of ozone layer in the atmosphere
- D. equal heating of different parts of the atmosphere Discuss
- 5. Light from the Sun reaches us in nearly
Options- A. 2 minutes
- B. 4 minutes
- C. 8 minutes
- D. 16 minutes Discuss
- 6. Intensity of sound has
Options- A. an object existence
- B. a subject existence
- C. no existence
- D. both subjective and objective existence Discuss
- 7. Light year is a unit of
Options- A. time
- B. distance
- C. light
- D. intensity of light Discuss
- 8. Light travels at the fastest speed in
Options- A. glass
- B. water
- C. hydrogen
- D. vacuum Discuss
- 9. 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
- 10. 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
Physics problems
Search Results
Correct Answer: the same number of protons but different number of neutrons
Correct Answer: the level of the liquid in the two vessels are at the same height
Correct Answer: increase its electrical conductivity
Correct Answer: unequal heating of different parts of the atmosphere
Correct Answer: 8 minutes
Correct Answer: an object existence
Correct Answer: distance
Correct Answer: vacuum
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
Correct Answer: metals are good conductor of heat
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