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- Question
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
- Correct Answer
- Their temperatures
ExplanationHeat always flows from a body at higher temperature to a body at a lower temperature.
- 1. A man jumping out of a moving train is thrown
Options- A. forward
- B. backward
- C. sidewaqys
- D. None of these Discuss
- 2. 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
- 3. 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
- 4. Ball bearings are used in cycles, scooters etc to
Options- A. Increase the friction between the wheel and the axle
- B. Reduce the friction between the wheel and the axle
- C. Reduce the friction between ground and the whee
- D. None of the above Discuss
- 5. Which of the following physical quantities do not have same dimensions
Options- A. Force and Pressure
- B. Work and Energy
- C. Impulse and momentum
- D. Weight and Force Discuss
- 6. 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
- 7. 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 Discuss
- 8. 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
- 9. 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
- 10. 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
Physics problems
Search Results
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: Reduce the friction between the wheel and the axle
Correct Answer: Force and Pressure
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: not be heard at any distance at all from it
Explanation:
As 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.
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
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