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- Question
Lightning is produced when
Options- A. Similar charges of electricity rush towards each other and then get repelled
- B. clouds strike against impurities in air and the friction burns up these impurities
- C. strong opposite charges in different clouds break down the resistance offered by the intervening air
- D. water vapour produces electricity in the clouds
- Correct Answer
- strong opposite charges in different clouds break down the resistance offered by the intervening air
ExplanationWhen the resistance of the air between breaks down the current flows from the positive cloud to the negative cloud in a flash which we call lightning . The difference of potential involves is very high.
- 1. Which of the following is an example of continous emission spectrum?
Options- A. Spectrum of an oil frame
- B. Spectrum of a water
- C. both
- D. none Discuss
- 2. What are the particles emitted by radio active element after 3 consequtive disintegrations?
Options- A. 2 alpha 1 beta
- B. 1 alpha 1 beta
- C. 2 beta 1 alpha
- D. 2 beta 2 alpha Discuss
- 3. Heat energy of an object is
Options- A. the average energy of the molecules of the object
- B. the total energy of the molecules of the object
- C. the average velocity of the molecules of the object
- D. the average potential energy of the molecules of the object Discuss
- 4. SI unit of Luminious intensity is
Options- A. Lumen
- B. Lux
- C. Candela
- D. Watt Discuss
- 5. What is the unit of resistance?
Options- A. ohm
- B. farad
- C. henry
- D. weber Discuss
- 6. A man stands on the pan of a balance holding a fish in his right hand and bucket of water in his left hand. If he transfers the fish into the bucket, the total weight on the pan
Options- A. increases
- B. decreases
- C. remains the same
- D. first increases and then decreases Discuss
- 7. A cyclist leans inwards when he is negotiating a curve so that
Options- A. he may increase his speed
- B. his weight may be reduced
- C. necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
- D. no frictional force may be produced between the wheels and the axle Discuss
- 8. Scalar Quantities are
Options- A. physical quantities which have magnitude only and no direction
- B. physical quantities which have no magnitude only and only direction
- C. physical quantities which have magnitude only and direction
- D. physical quantities which have no magnitude and no direction Discuss
- 9. Which is the weakest force in the universe? Discuss
- 10. A projectile launched at____ degree angle has the greatest range? Discuss
Physics problems
Search Results
Correct Answer: Spectrum of an oil frame
Explanation:
Spectrum of an oil frame is an example for continuous emission spectrum
Correct Answer: 2 beta 1 alpha
Correct Answer: the total energy of the molecules of the object
Correct Answer: Candela
Correct Answer: ohm
Correct Answer: remains the same
Explanation:
Before transferring the fish, the position is the man with the fish and the bucket of water. After transferring the position is: the man without the fish, but the fish inside the water in the bucket. Thus to know whether there is any change in weight, it is enough to consider whether there is any change in weight when the fish in air is transferred into the water. The answer is there is no change as when in water though it loses weight due to upthrust of water on it, the level of water increases and exerts an equal force at the bottom.So, (c) is correct.
Correct Answer: necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
Explanation:
No circular or curved motion is possible without providing the necessary centripetal force. (C) provides this and so is the answer.
Correct Answer: physical quantities which have magnitude only and no direction
Correct Answer: Gravitational Force
Correct Answer: 45
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