61. The most familiar from of radiant energy in sunlight that cause tanning and has the potential for causing melanoma in humans is called
62. Light Emitting Diode (LED) converts
- A. light energy into electrical energy
- B. electrical energy into light energy
- C. thermal energy into light energy
- D. mechanical energy into electrical energy
- Check Answer | Discussion
63. Which of the following statements given below is correct in the respect of a geostationary satellite?
- A. It moves in a plane containing the Greenwich meridian
- B. It moves in a plane perpendicular to the celestial equatorial plane
- C. Its height above the earth's surface is about the same as the radius of the earth
- D. Its height above the earth's surface is about the six times the radius of the earth
- Check Answer | Discussion
64. Which of the following statements given below is correct in the respect of a geostationary satellite?
- A. real inverted, same size at the focus
- B. real, upright same size at the focus
- C. virtual, inverted highly enlarged infinity
- D. real, inverted highly enlarged at infinity
- Check Answer | Discussion
65. The phenomenon of bursting of hydrogen balloon is based on
66. Cavitation is a special application property exhibited only by
67. In the electric supply lines in India, which parameter is kept constant?
68. Mirage is a phenomenon due to
- A. reflaction of light
- B. refraction of light
- C. total internal reflection of light
- D. total diffraction of light
- Check Answer | Discussion
69. Which one of the following remains constant while throwing the ball upward?
70. Why laser is used in the pipe alignment ?
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