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- Question
A Fuse is used in mains electric supply as a safety devices. Which one of the following statements about the fuse is correct?
Options- A. It is connected in parallel with the main switch
- B. It is made mainly from silver alloys
- C. It must have a low melting point
- D. It must have a very high resistance
- Correct Answer
- It must have a low melting point
- 1. photosynthesis takes place faster in
Options- A. darkness
- B. red light
- C. white light
- D. yellow light Discuss
- 2. On which day ' National Science Day ' is celebrated in India ?
Options- A. February 23
- B. February 25
- C. February 26
- D. February 28 Discuss
- 3. Which of the following is the fastest communication channel?
Options- A. Microwave
- B. Optical fiber
- C. Radio wave
- D. All are operating at nearly the same propagation speed Discuss
- 4. Which of the following is a scalar quantity
Options- A. electric current
- B. electric field
- C. Acceleration
- D. linear momentum Discuss
- 5. Unit of solid angle is
Options- A. degree
- B. radian
- C. steradian
- D. radian second Discuss
- 6. No current will flow between two charged bodies if they have the same
Options- A. resistance
- B. charge
- C. potential
- D. charge/ potential ratio Discuss
- 7. At the Curie temperature, the ferromagnetic materials get converted into
Options- A. Diamagnetic materials
- B. Non-magnetic materials
- C. Paramagnetic materials
- D. None of the others Discuss
- 8. A disk and a sphere of same radius but different masses roll on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ?
Options- A. Depends on their masses
- B. Sphere
- C. Disk
- D. Both reach at the same time Discuss
- 9. A kilowatt-hour is unit of
Options- A. Power
- B. Electric charge
- C. Energy
- D. Electric current Discuss
- 10. In very cold countries alcohol is used as a thermometric liquid because
Options- A. alcohol is a poor conductor of heat
- B. alcohol can be coloured for its level to be seen easily
- C. its freezing point is very low
- D. it will not stick to the glass tube Discuss
Physics problems
Search Results
Correct Answer: white light
Explanation:
As far as the rate of photosynthesis is concerned, it is fastest in white light making the rate of photosynthesis maximum.
After White, We Have Violet Light Where Photosynthesis Occur To A Higher Extent as It Has The Shortest Wavelength Hence Has The Max Energy.
So The Order Is :: white>violet>blue.
Correct Answer: February 28
Explanation:
National Science Day is celebrated in India on 28 February each year to mark the discovery of the Raman effect by Indian physicist Sir Chandrashekhara Venkata Raman on 28 February 1928.
Correct Answer: Microwave
Explanation:
A microwave is the fastest communication channel whereas Optical fiber is a way of transferring data not a way of communication.
Correct Answer: electric current
Explanation:
A Scalar quantity is a quantity that has only magnitude but no direction as like vector.
Here in the given options, electric current is the only one which is scalar.
Correct Answer: steradian
Correct Answer: potential
Explanation:
An electric charge always flows from a body at higher potential to a body at a lower potential irrespective of the amounts of charges contained in them. In the question , no current flows. So there is no potential difference.
Correct Answer: Paramagnetic materials
Correct Answer: Sphere
Explanation:
Time does not depend on mass, else
=> is least for 'sphere' and
hence least time is taken by sphere.
Correct Answer: Energy
Explanation:
The kilowatt hour (kW?h) is a composite unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour.
One watt is equal to 1 J/s. One kilowatt hour is 3.6 megajoules.
Correct Answer: its freezing point is very low
Explanation:
Alcohol has a freezing point as low as . So it won't freeze even in very cold countries.
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