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- Question
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
- Correct Answer
- Sphere
ExplanationTime does not depend on mass, else
=> is least for 'sphere' and
hence least time is taken by sphere.
- 1. 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
- 2. 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
- 3. 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 Discuss
- 4. photosynthesis takes place faster in
Options- A. darkness
- B. red light
- C. white light
- D. yellow light Discuss
- 5. On which day ' National Science Day ' is celebrated in India ?
Options- A. February 23
- B. February 25
- C. February 26
- D. February 28 Discuss
- 6. A kilowatt-hour is unit of
Options- A. Power
- B. Electric charge
- C. Energy
- D. Electric current Discuss
- 7. 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
- 8. Which Color has the Longest Wavelength?
Options- A. Violet
- B. Yellow
- C. Red
- D. White Discuss
- 9. Light from the sun reaches us in nearly
Options- A. 5 min
- B. 4.30 hrs
- C. 8 min
- D. 5.30 hrs Discuss
- 10. Where should a boat compass be mounted?
Options- A. near magnet
- B. near iron
- C. away from electrical wiring
- D. All the above Discuss
Physics problems
Search Results
Correct Answer: Paramagnetic materials
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: It must have a low melting point
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: 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.
Correct Answer: Red
Explanation:
The visible colors from Longest wavelength to Shortest wavelength are :: Red, Orange, Yellow, Green, Blue and Violet.
Red > Orange > Yellow > Green > Blue > Violet.
1. Infrared radiation has a longer wavelength than visible Red light.
2. Ultraviolet radiation has a shorter wavelength than the visible violet light.
3. The white light is a mixture of the colors of the visible spectrum.
Correct Answer: 8 min
Explanation:
The light from the sun takes about 8 minutes to reach the Earth after it has been emitted from the sun's surface.
The time it takes for light to reach planets in our Solar System varies from about 3 minutes for Mercury to about 5.3 hours for Pluto.
Correct Answer: away from electrical wiring
Explanation:
A compass, which is used to assist in navigation, is an instrument that shows magnetic north. You must apply a correction to determine the direction of true north. The ability to steer a boat by a compass is useful if land is out of sight, visibility is reduced, or the boat operator is disoriented.
Mount a boat compass away from iron, magnets, and electrical wiring and equipment.
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