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- Question
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
- Correct Answer
- remain the same
ExplanationThe 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.
- 1. Sound following a flash of lightning is called
Options- A. Stoning
- B. Bolting
- C. Thunder
- D. Cloud clash Discuss
- 2. Where should a boat compass be mounted?
Options- A. near magnet
- B. near iron
- C. away from electrical wiring
- D. All the above Discuss
- 3. Light from the sun reaches us in nearly
Options- A. 5 min
- B. 4.30 hrs
- C. 8 min
- D. 5.30 hrs Discuss
- 4. Which Color has the Longest Wavelength?
Options- A. Violet
- B. Yellow
- C. Red
- D. White Discuss
- 5. 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
- 6. 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
- 7. "The Law of Kepler" is related with which among the following ?
Options- A. Planetary Motion
- B. Law of Conservation of energy
- C. Law of Gravitation
- D. None Discuss
- Kepler?s three laws of planetary motion can be stated as follows:
- 8. Decibel is the unit of
Options- A. speed of light
- B. intensity of sound
- C. intensity of heat
- D. None of these Discuss
- 9. Which of the following is not a transverse wave?
Options- A. Light waves
- B. Radio waves
- C. Sound waves
- D. All the above Discuss
- 10. Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K?
Options- A. K1k2/k1+k2
- B. 2k1k2/k1+k2
- C. K1+k2/k1k2
- D. None Discuss
Physics problems
Search Results
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: 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: 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: 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: 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: inertia
Explanation:
Flows out of Newton's first law of motion.
Correct Answer: Planetary Motion
Explanation:
Kepler's laws of planetary motion are three scientific laws describing the motion of planets around the Sun.
(1) All planets move about the Sun in elliptical orbits, having the Sun as one of the foci.
(2) A radius vector joining any planet to the Sun sweeps out equal areas in equal lengths of time.
(3) The squares of the sidereal periods (of revolution) of the planets are directly proportional to the cubes of their mean distances from the Sun.
Correct Answer: intensity of sound
Correct Answer: Sound waves
Explanation:
Correct Answer: 2k1k2/k1+k2
Explanation:
We know that,
The equivalent K =
where L1 & L2 are plate1 & Plate2 thicknesses, K1 & K2 are coefficient thermal conductivity of plate1 & Plate2 respectively.
But here L1 = L2 = L (say)
Then K = L+L/(L/K1 + L/K2) =
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