Physics Practice Question and Answer
8 Q: The device that converts alternating current to direct current is called
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5f72ea2e2d9d25248e04b7bb- 1inverterfalse
- 2rectifiertrue
- 3transformerfalse
- 4transmitterfalse
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Answer : 2. "rectifier"
Q: Which of the person with long vision defect has glasses?
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5fe41d33438750744e325bce- 1concave lensfalse
- 2Bifocal lensfalse
- 3convex lenstrue
- 4cylindrical lensfalse
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Answer : 3. "convex lens"
Q: An object starts moving in its steady state. It attains a speed of 5 m / s in 2 seconds. What will be its acceleration?
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5f869de3e5230d620733716e- 12.5 m/sec2true
- 22 m/sec2false
- 31 m/sec2false
- 40.4 m/sec2false
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Answer : 1. "2.5 m/sec2"
Q: In the human eye?
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5fe4599257a5647868b5e752- 1In the human eye?false
- 2convex mirrorfalse
- 3convex lenstrue
- 4concave mirrorfalse
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Answer : 3. "convex lens"
Q: A potentiometer is considered a versatile and accurate device to make an electrical measurement of EMF. Why?
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63c8d7f2bdbddb32fda0219d- 1Because the method involves a combinationfalse
- 2There are cells involvedfalse
- 3Because of potential gradientsfalse
- 4As there is no flow of current through the galvanometertrue
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Answer : 4. "As there is no flow of current through the galvanometer"
Explanation :
A potentiometer is an accurate and versatile device to make electrical measurements of emf because the method involves a condition of no current flow through the galvanometer, the device can be used to measure potential difference, internal resistance of a cell and compare emf's of two sources. Q.
Q: According to the law of reflection of light -
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5f6da417ff25c92a085bb0d5- 1The angle of incidence is greater than the angle of reflectionfalse
- 2The angle of incidence is equal to the angle of reflectiontrue
- 3The angle of incidence is smaller than the angle of reflectionfalse
- 4All the statements are truefalse
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Answer : 2. "The angle of incidence is equal to the angle of reflection"
Q: Which of the following is not a unit of heat?
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63a2c8e521b1fe5f1a352faa- 1Caloriefalse
- 2Phontrue
- 3Joulefalse
- 4Kcalfalse
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Answer : 2. "Phon"
Explanation :
The correct answer is Phon. Phon is not a unit of Heat.
Q: Which is the force due to which the body is pulled towards the center of the earth?
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5f8fcee93ca2d767b181e989- 1Gravitational forcetrue
- 2Massfalse
- 3Momentumfalse
- 4impulsive forcefalse
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