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- Question
Which Color has the Longest Wavelength?
Options- A. Violet
- B. Yellow
- C. Red
- D. White
- Correct Answer
- Red
ExplanationThe 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.
- 1. 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
- 2. A kilowatt-hour is unit of
Options- A. Power
- B. Electric charge
- C. Energy
- D. Electric current Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. Light from the sun reaches us in nearly
Options- A. 5 min
- B. 4.30 hrs
- C. 8 min
- D. 5.30 hrs Discuss
- 7. Where should a boat compass be mounted?
Options- A. near magnet
- B. near iron
- C. away from electrical wiring
- D. All the above Discuss
- 8. Sound following a flash of lightning is called
Options- A. Stoning
- B. Bolting
- C. Thunder
- D. Cloud clash Discuss
- 9. A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will
Options- A. first rise and then fall
- B. fall
- C. remain the same
- D. rise Discuss
- 10. The inability of a body to change its state of rest or uniform motion along a straight line is called its
Options- A. momentum
- B. velocity
- C. acceleration
- D. inertia Discuss
Physics problems
Search Results
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: 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: Sphere
Explanation:
Time does not depend on mass, else
=> is least for 'sphere' and
hence least time is taken by sphere.
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: 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.
Correct Answer: Thunder
Explanation:
The Sound Following the flash of lighting is because of Thunder.
Lightning is seen earlier than thunder because light travels much faster than sound.
The roar of thunder is the result of a shock wave produced when lightning super-heats the air through which it passes, causing that air to expand very rapidly. This rapid expansion of air creates a shock wave that travels outward at close to the speed of sound.
Correct Answer: remain the same
Explanation:
The submerged portion of the ice on melting shrinks a little in volume. so the level of water goes down a little.But this is just made up by the water added by the melting of upper portion. Addition is equal to the Shrinkage. Hence level is unchanged.
Correct Answer: inertia
Explanation:
Flows out of Newton's first law of motion.
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