Multiple Choice Questions Class /11th
1.Who made these remarks "time is what a clock reads'.
(a) Newton
(b)Einstein
(c) CV Raman
(d)none of these
(B) is Correct answer .
2 Fundamental unit of luminous intensity is
(a) watt
(b)candela
(c) newton
(d)lux
(B) is Correct answer.
3. Weber is derived unit of
(a) magnetic moment (b) luminous flux
(c) magnetic flux (c)none of these
(C) is Correct answer.
4. A standard metre is equal to k wavelengths in vacuum, of the radiation from Krypton 86, where k is
(a) 165076.37
(b)16507637.3
(c) 1650763.73
(d)none of the above.
(C) is Correct answer
5. The prefix femto stands for
(b) 10¹⁵
(a) 10‐¹⁵
(d) 10⁵
(c)10‐⁵
(B) is Correct answer.
6. How many disintegrations per second make up 1 curie ?
(a) 3.7 x 10¹0
(a) 3.7 x 10¹³
(c) 3.7x 10⁷
(d)none of the above
(A) is Correct answer.
7. The mass of sun is of the order of
(a) 10⁵⁵kg
(b)10⁴²kg
(c) 10‐³⁰ kg
(d)10³⁰kg
(D) is Correct answer.
8. Time interval between two successive heart beats is of the order of
(a) 10 s
(b) 10‐²s
(c) 10⁰s
(d)10‐1s
(C) is Correct answer.
9. Accuracy of cesium clock is
(a) 1 part in 10⁷
(b)part in 10¹³
(C) 1 part in 10‐⁷
(d)1paet in 10‐¹³
(B) is Correct answer.
10. Quartz crystal clocks have an accuracy of 1 sec in every.
(a) 10‐⁹ s
(b)10⁹s
(c) 10‐¹³s
(d)10¹³s
(B) is Correct answer.
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