Physics Practice Question and Answer
8 Q: What type of magnet is used in commercial motors?
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5fe45c0c57a5647868b60225- 1Permanent magnetfalse
- 2umbilical magnetfalse
- 3electromagnettrue
- 4Common rod magnetfalse
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Answer : 3. "electromagnet"
Q: On which part of the eye does the reflection of an object lie?
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5fe45b109002d17b1c42e984- 1corneafalse
- 2Retinatrue
- 3Irisfalse
- 4pupilfalse
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Answer : 2. "Retina"
Q: Used in solar cooker?
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5f6da8ddec13dd74800548f7- 1concave mirrortrue
- 2convex mirrorfalse
- 3plane mirrorfalse
- 4None of thesefalse
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Answer : 1. "concave mirror"
Q: Pressure inside a soap bubble is-
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6062c4148278fd4419261ced- 1More than atmospheric pressuretrue
- 2Less than atmospheric pressurefalse
- 3Equal to atmospheric pressurefalse
- 4Half of atmospheric pressure/false
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Answer : 1. "More than atmospheric pressure"
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: What is the color that is used in danger signals?
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5fe46a3d57a5647868b6522c- 1Yellow colorfalse
- 2Purple colorfalse
- 3Blue colorfalse
- 4Red colortrue
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Answer : 4. "Red color"
Q: Who found an empirical relationship between the half-life of alpha decay and the energy of the emitted alpha particles in 1911?
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649a9fbcc7d7c7e0672ba384- 1Fermi and Meitnerfalse
- 2Geiger and Nuttalltrue
- 3Chadwick and Lawrencefalse
- 4Soddy and Astonfalse
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Answer : 2. "Geiger and Nuttall "
Explanation :
In 1911, Geiger and Nuttall discovered an empirical relationship between the half-life of alpha decay and the energy of the emitted alpha particles.
Q: The value of the velocity of sound is the lowest.
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5f8fd0813ca2d767b181f610- 1Solidfalse
- 2Liquidfalse
- 3Gasestrue
- 4All of thesefalse
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