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- Question
The information of brilliant colors in a thin soap film is a consequence of the phenomena of
Options- A. Polarization and interference
- B. Diffraction and dispersion
- C. Multiple refraction and dispersion
- D. Multiple reflection and interference
- Correct Answer
- Multiple reflection and interference
- 1. What is the full form of "RADAR" ?
Options- A. Radio Detecting and Ranging
- B. Region Device and Ranging
- C. Radio Detect and Rangs
- D. Radio Device and Ranging Discuss
- 2. If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to _____ ?
Options- A. 300 m
- B. 30 m
- C. 3 m
- D. 0.3 m Discuss
- 3. The working of the quartz crystal in the watch is based on the
Options- A. Piezo - electric Effect
- B. Edison Effect
- C. Photoelectric Effect
- D. Johnson Effect Discuss
- 4. Total internal reflection can take place when light travels from
Options- A. Air to glass
- B. Air to water
- C. Water to glass
- D. Diamond to glass Discuss
- 5. A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will
Options- A. increase
- B. decrease
- C. remains the same
- D. first decrease and then increase Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. A man jumping out of a moving train is thrown
Options- A. forward
- B. backward
- C. sidewaqys
- D. None of these Discuss
Physics problems
Search Results
Correct Answer: Radio Detecting and Ranging
Correct Answer: 300 m
Correct Answer: Piezo - electric Effect
Correct Answer: Diamond to glass
Correct Answer: decrease
Explanation:
Let M and m grams be the mass of boat + rock in it. By law of floatation(M+m) grams of water will be displaced. This has a volume of (M+m)cc. That means the level of water in pool has risen up by (M+m)cc with the boat + rock when it is floating. If the rocks in the boat are thrown not into the pool but outside, the weight left is only M grams the weight of the boat. This will have displaced M cc of water only i.e less water than in the case of loaded boat. But if the rocks are put in the water in the pool and not outside, then the water in the pool will rise not only by M cc on account of empty boat but also by a volume of the stone put into it. This volume will be where m is the mass of rock and d density of rock.
Now is < m. Thus the total rise will be which is < M + m.
Correct Answer: Force and Pressure
Correct Answer: Reduce the friction between the wheel and the axle
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: more than the true weight
Correct Answer: forward
Explanation:
At the time of jumping out he has the same velocity as the moving train
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