Discussion
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- Question
The value of acceleration due to gravity (g) at a distance of 2R from the surface of earth, where R is the radius of earth is ______.
Options- A. g/3
- B. g/4
- C. g/9
- D. g/2
- Correct Answer
- g/9
- 1. If ice floating on water in a vessel melts, the water level in the vessel _______.
Options- A. increases
- B. does not change
- C. first increases before decreasing
- D. decreases Discuss
- 2. What is the unit of the physical quantity "Magnetic field strength"?
Options- A. joule per meter
- B. newton per meter
- C. kelvin per meter
- D. ampere per meter Discuss
- 3. A transformer can do all of the following except
Options- A. step-up a/c voltage
- B. step-up a/c current
- C. step-up a/c power
- D. step-down a/c voltage Discuss
- 4. Physical quantities, which have _______ only and no _______ are called scalar quantities.
Options- A. direction, magnitude
- B. magnitude, direction
- C. speed, velocity
- D. velocity, speed Discuss
- 5. Fundamental duties are included in the Indian Constitution by the_________Amendment.
Options- A. 44th
- B. 42nd
- C. 26th
- D. 25th Discuss
- 6. Electrical Energy is the energy of
Options- A. Protons
- B. Neutrons
- C. Electrons
- D. All the above Discuss
- 7. The velocity required to place a vehicle in orbit round the moon is _______ that required to place it in orbit round the earth
Options- A. less than
- B. Greater than
- C. equal to
- D. greater than or equal to Discuss
- 8. A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the the bucket. The reading of the spring balance
Options- A. will increase
- B. will decrease
- C. does not change
- D. varies with the increase of depth of the immersion of the iron piece Discuss
- 9. Radiocarbon is produced in the atmosphere as a result of
Options- A. collision between fast neutrons and nitrogen nuclei present in the atmosphere
- B. action of ultraviolet light from the sun on atmospheric oxygen
- C. action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
- D. lightning discharge in atmosphere Discuss
- 10. Radian is used to measure
Options- A. Temperature
- B. Intensity of Flame
- C. Angle
- D. Solid Angle Discuss
Physics problems
Search Results
Correct Answer: does not change
Correct Answer: ampere per meter
Correct Answer: step-up a/c power
Correct Answer: magnitude, direction
Correct Answer: 42nd
Correct Answer: Electrons
Explanation:
We know that Kinetic energy is the energy of a moving object and in the same way Electrical energy is the form of kinetic energy caused by moving electric charges called electrons.
Correct Answer: less than
Explanation:
This orbital velocity at the moon is less because orbital velocity =
where 'r ' is the orbital radius. i.e the distance of the body from the center of the earth and 'g' is the acceleration due to gravity on the body in question. In the case of the moon, both r and g are less than in the case of the earth.
Correct Answer: will increase
Explanation:
When the piece of iron is lowered into the water, the water level in the bucket increases. And so the pressure at the bottom of bucket also increases. Thus the total thrust at bottom also increases. Therefore the spring balance reading increases. Thus (a) is correct.
Correct Answer: collision between fast neutrons and nitrogen nuclei present in the atmosphere
Correct Answer: Angle
Explanation:
Kelvin is used to measure Temperature,
Candela is used to measure Intensity of flame,
Steredian is used to measure Solid Angle.
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