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- Question
If a band is played on the moon the sound will
Options- A. reverberate
- B. be heard by us faintly
- C. be heard upto 10km from it
- D. not be heard at any distance at all from it
- Correct Answer
- not be heard at any distance at all from it
ExplanationAs there is no atmosphere surrounding the moon, the sound from any band that is played there cannot travel outwards there is no material medium surrounding it for its propagation.
- 1. A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf's is :
Options- A. 3:4
- B. 5:4
- C. 5:1
- D. 3:2 Discuss
- 2. The direction of heat flow between two objects depends on
Options- A. Their masses
- B. Their heat contents
- C. Their temperatures
- D. Whether they are in solid, liquid or gaseous state Discuss
- 3. A man jumping out of a moving train is thrown
Options- A. forward
- B. backward
- C. sidewaqys
- D. None of these Discuss
- 4. If lift is going up with acceleration, the apparent weight of a body is
Options- A. may be more or less than true weight
- B. more than the true weight
- C. less than the true weight
- D. equal to the true weight Discuss
- 5. The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because
Options- A. the ringing is not loud enough
- B. the glass of the bell jar absorbs the sound waves
- C. the bell jar is too small
- D. there is no air or any other gas in the bell jar Discuss
- 6. If an empty cylinder is half filled with a liquid, its center of gravity is
Options- A. shifted upwards
- B. shifted downwards
- C. shifed neither upward nor downward
- D. shifted upward or downward depending on the density of the liquid Discuss
- 7. The capacity of a pure capacitor is 1 farad. In D.C circuit, its effective resistance will be
Options- A. Zero
- B. Infinite
- C. 1 Ohm
- D. 1/2 Ohm Discuss
- 8. One astronomical unit is the average distance between
Options- A. Earth and the Sun
- B. Earth and the Moon
- C. Jupiter and the Sun
- D. Pluto and the Sun Discuss
- 9. The quality of sound produced by an instrument depends on the
Options- A. Frequency
- B. Intensity
- C. Number of overtones
- D. None of these Discuss
- 10. 1 Joule is Equal to
Options- A. 10^3 ergs
- B. 10^6 ergs
- C. 10^7 ergs
- D. 10^5 ergs Discuss
- Joule is the Unit of Energy.
Physics problems
Search Results
Correct Answer: 3:2
Explanation:
In series : E1 + E2 = K(50)
In parallel : E1 - E2 = K(10)
E1 + E2 / E1 - E2 = 5/1
=> E1/E2 = 3/2
The emf's are in the ratio of 3:2.
Correct Answer: Their temperatures
Explanation:
Heat always flows from a body at higher temperature to a body at a lower temperature.
Correct Answer: forward
Explanation:
At the time of jumping out he has the same velocity as the moving train
Correct Answer: more than the true weight
Correct Answer: there is no air or any other gas in the bell jar
Explanation:
As there is no medium inside the bell jar, sound cannot travel
Correct Answer: shifted downwards
Explanation:
Effect of adding liquid is to make the cylinder more bottom heavy which is a more stable position
Correct Answer: Infinite
Correct Answer: Earth and the Sun
Correct Answer: Number of overtones
Correct Answer: 10^7 ergs
Explanation:
1 Joule =
= 0.000239 Kilo Calories.
Joule is equal to Energy transferred to an object when a force of One Newton acts on that object in the direction of its motion through a distance of one metre.(1 N-m)
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