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- Question
During thunderstorm you are travelling in a car. To protect yourself from the lightning you will have to
Options- A. remain in the car
- B. get out of the car and lie flat in the ground
- C. abandon the car and take shelter under a nearby tree
- D. touch the nearest electric pole
- Correct Answer
- remain in the car
ExplanationThe Whole car - the body and inside - can be considered to be a hallow conductor. During the thunderstorm the body - i.e, the outside- gets a charge but there will be no charge inside. so the inside is safe.
- 1. A car parked in the sun with its windows closed gets terribly hot inside. This is due to
Options- A. the heat emitted by the engine
- B. the greenhouse effect
- C. the good conducting power of the metal body
- D. the double layered wind shield Discuss
- 2. Which is the liquid that shows Capillary fall? Discuss
- 3. Which is the strongest force in the universe? Discuss
- 4. Learned indian classical vocalists do not like the accompaniment of a harmonium because
Options- A. tempered scale is used in the harmonium
- B. diatonic scale is used in the harmonium
- C. notes of the harmonium are too shrill
- D. intensity of the notes of the harmonium is too large Discuss
- 5. Which one of the following groups have quantities that do not have the same dimensions
Options- A. pressure, stress
- B. velocity, speed
- C. force, impulse
- D. work, energy Discuss
- 6. An atom bomb based upon the principal of ________
Options- A. Nuclear fission
- B. Nuclear fussion
- C. Controlled chain reaction
- D. None of these Discuss
- 7. Lightning heats the surrounding air to
Options- A. 300 deg Cent
- B. 3000 deg Cent
- C. 30000 deg Cent
- D. 300000 deg Cent Discuss
- 8. The absorption of ink by blotting paper involves
Options- A. viscosity of ink
- B. diffusion of ink through the blotting
- C. capillary action phenomenon
- D. siphon action Discuss
- 9. A ball is thrown vertically upward from the ground. It crosses a point at the height of 25 m twice at an interval of 4 seconds. The ball was thrown with the velocity of
Options- A. 18 m/s
- B. 25 m/s
- C. 30 m/s
- D. 36 m/s Discuss
- 10. A woman?s voice is shriller than a man?s voice due to
Options- A. weak vocal chords
- B. lower frequency
- C. higher frequency
- D. higher amplitude Discuss
Physics problems
Search Results
Correct Answer: the greenhouse effect
Explanation:
The green house effect. The waves of smaller wavelength from the sun enter inside the car through the glass windows and are absorbed. The waves of larger wavelength emitted from inside cannot get out through the glass, but remain inside and make it terribly hot.
Correct Answer: Mercury
Correct Answer: Nuclear Force
Correct Answer: tempered scale is used in the harmonium
Correct Answer: force, impulse
Correct Answer: Nuclear fission
Correct Answer: 30000 deg Cent
Explanation:
Lightning is extremely hot ? a flash can heat the air around it to temperatures five times hotter than the sun?s surface. This heat causes surrounding air to rapidly expand and vibrate, which creates the pealing thunder we hear a short time after seeing a lightning flash.
Lightning heats the surrounding air to about 30,000 degrees Centigrades.
Correct Answer: capillary action phenomenon
Explanation:
The absorption of ink by blotting paper involves capillary action phenomenon because the blotting paper is a thin and a smooth paper which allows a little thicker liquids like ink to absorb.
Correct Answer: 30 m/s
Explanation:
The interval between object pass the same point is 4 sec.
That means in 2 sec, object reaches the top and in next 2 sec, it again reaches the same point.
By the info given, we can find the velocity of that point by using : v=u+(-gt)
0= u - 10×2
u = 20
Then the velocity at 25m is 20m/sec.
so the initial velocity is
Correct Answer: higher frequency
Explanation:
As the frequency of sound is higher, women have shriller voices than men.
The shrillness or pitch of a sound is determined by its frequency. The higher the pitch shriller the voice. As the sounds produced by vocal cords of women are higher than men so women have shriller voices than men. Because their vocal cord is of smaller size. As their vocal cord is more stretched than men's.
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