A short sighted person can see distinctly only those objects which lie between 10 cm and 100 cm from him. The power of the spectacle lens required to see a distant object is
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(a) + 0.5 D |
(b) – 1.0 D |
(c) – 10 D |
(d) + 4.0 D |
(b) – 1.0 D
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If one starts with one curie of radioactive substance (T1/2 = 12 hrs) the activity left after a period of 1 week will be about
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(a) 1 curie |
(b) 120 micro curie |
(c) 60 micro curie |
(d) 8 mili curie |
In two separate set - ups of the Young's double slit experiment, fringes of equal width are observed when lights of wavelengths in the ratio 1 : 2 are used. If the ratio of the slit separation in the two cases is 2 : 1, the ratio of the distances between the plane of the slits and the screen in the two set - ups is
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(a) 4 : 1 |
(b) 1 : 1 |
(c) 1 : 4 |
(d) 2 : 1 |
Assertion : 29 is the equivalent decimal number of binary number 11101.
Reason : (11101)2 = (1 × 24 + 1 × 23 + 1 × 22 + 0 × 21 + 1 × 20 )10 = (16 + 8 + 4 + 0 + 1)10 = (29)10
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |