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2 Q) "Consider the following statements with reference to X-rays
I. They produce heat when absorbed by matter.
II. They are generated when fast moving electron strike a metal target.
III. They can penetrate through a thin sheet of aluminium.
"Which of the following statements given above are correct?
(a) I, II and III (b) I and II
(c) I and III (d) II and III"
3 Q) "Which of the following statements is/are true?
1. The angle of the axis in relation to the planer in which the earth revolves around the sun is not constant.
2. The amount of energy given off by the sun changes with the transparency of the atmosphere.
"Select the correct answer using the codes given below
(a) Only 1 (b) Only 2
(c) Both 1 and 2 (d) Neither 1 nor 2"
6 Q) "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"