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Question Detail
The angle of reflection is equal to the angle of incidence.
- True
- False
Answer: Option A
1. What is escape velocity ?
- Escape velocity is the maximum velocity with which a body should be projected from the surface of earth so it do not go beyond gravitational field of earth.
- Escape velocity is the minimum velocity with which a body should be projected from the surface of earth so it do not go beyond gravitational field of earth.
- Escape velocity is the minimum velocity with which a body should be projected from the surface of earth so as it goes out of gravitational field of earth and never return to earth.
- Escape velocity is the maximum velocity with which a body should be projected from the surface of earth so as it goes out of gravitational field of earth and never return to earth.
Answer: Option C
2. The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called
- Nuclear fusion
- Nuclear fission
- Nuclear reaction
- Fast breeding
Answer: Option B
3. Alexander Graham Bell invented
- Telephone
- Telescope
- Television
- Tank
Answer: Option A
Explanation:
Alexander Graham Bell of USA invented Telephone in 1876,
Telescope was invented by Hans Lippershey of Netherlands in 1608,
Television was invented by John Logie Bared of Scotland in 1926,
Tank was invented by Sir Ernest Swington of England in 1914.
4. Marie and Pierre Curie invented
- Radio
- Radium
- Radar
- Refrigerator
Answer: Option B
Explanation:
Marie and Pierre Curie of France invented Radium in 1898,
Radio was invented by G. Marconi of England in 1901,
Radar was invented by Dr. A.H. Taylor and L.C. Young of USA in 1922,
Refrigerator was invented by J. Harrison and A. Catlin of Britain in 1834.
5. Which instrument is used to measure the power of electric circuit ?
- Voltmeter
- Wattmeter
- Wavemeter
- Viscometer
Answer: Option B
Explanation:
Voltmeter - is used to measure electric potential difference between two points,
Wavemeter - is used to measure the wavelength of a radiowave,
Viscometer - is used measure viscosity of liquid.
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