Physics Practice Question and Answer
8 Q: If the kinetic energy of a satellite is halved, its orbital radius becomes _____
1777 063c7b9788731ac33279af158
63c7b9788731ac33279af158- 1½ timestrue
- 22 timesfalse
- 34 timesfalse
- 4Infinityfalse
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Answer : 1. "½ times"
Explanation :
radius of its orbit will become half.
Q: What is the capacity of a convex lens?
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5f6da679ec13dd748004e02b- 1negativefalse
- 2positivetrue
- 3zerofalse
- 4Othersfalse
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Answer : 2. "positive"
Q: Polar satellites are used for high-resolution imaging of the earth’s surface because _____
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63c7c166bd6d9033208efbdf- 1They have better camerasfalse
- 2They are very high above the surface of the earth and travel slowly to gather more informationfalse
- 3They are closer to the surface of the earth and can cover vast areas very quicklytrue
- 4They can be launched by most countries in the worldfalse
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Answer : 3. "They are closer to the surface of the earth and can cover vast areas very quickly"
Explanation :
Explanation: Since polar satellites orbit close to the surface of the earth, it is easier to click images of the planet's surface with greater detail. Their high orbital velocity enables them to view most of the surface strip-by-stip very quickly with which high-resolution images can be constructed.
Q: Transformers are used
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5f72ea92a921aa16e6825ed6- 1To convert AC into DCfalse
- 2To convert DC to ACfalse
- 3To detect DC voltagefalse
- 4To oxidation or reduce AC voltagetrue
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Answer : 4. "To oxidation or reduce AC voltage"
Q: The product of force and displacement is called—
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5f86a302b7ad805e26c163d8- 1Accelerationfalse
- 2Worktrue
- 3Momentumfalse
- 4Weightfalse
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Answer : 2. "Work"
Q: What happens to the speed of a cycle when it travels on a rough surface?
1765 05ee88a3679b5ea388bed4575
5ee88a3679b5ea388bed4575- 1Increasesfalse
- 2Decreasestrue
- 3Remains the samefalse
- 4None of thesefalse
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Answer : 2. "Decreases"
Q: Which of the following is not a unit of time?
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60b4b8fa7cb636175d3d12f6- 1light yeartrue
- 2leap yearfalse
- 3Moon monthfalse
- 4None of thesefalse
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Answer : 1. "light year"
Q: Convex lens is used?
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5eec76a3eee45c3b837f7bc5- 1To correct the vision defect in human eyefalse
- 2Visionaryfalse
- 3under microscopefalse
- 4All of the abovetrue
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