NEET Physics: Questions 1870 - 1873 of 2099
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Question number: 1870
In an experiment to determine the focal length (f) of a concave mirror by the u - v method, a student places the object pin O on the principal axis at a distance x from the pole P. The student looks at the pin and its inverted image at I on principal axis from a distance keeping his/her eye in line with PO. When the student shifts his/her eye towards left, the image appears to the right of the object pin. Then,
Question number: 1871
A satellite is revolving in an orbit close to the earth’s surface. Taking the radius of the earth as 6.4 ⨯ 10 6 meter, the value of the orbital speed and the period of revolution of the satellite will respectively be (g = 9.8 meter/sec 2)
7.2 km/sec, 8.6 minutes
7.2 km/sec, 84.6 minutes
0.72 km/sec, 84.6 minutes
2.7 km/sec, 8.6 minutes
Question number: 1872
Question number: 1873
Beats cannot be produced by light sources.
Light sources have constant phase difference.
|a.||Ꭺ is true but Ꭱ is false|
|b.||Ꭺ is false but Ꭱ is true|
|c.||Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ|
|d.||Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ|