Questions Paper For Engineering
1. A satellite is orbiting around the earth by what percentage should we increase its velocity so as to enable it escape away from the earth?
(a) 41.4%
(b) 50%
(c) 82.8%
(d) 100%
Ans a
2. At what temperature, the hydrogen molecule will escape from earth’s surface?
(a) 101k
(b) 102k
(c) 103k
(d) 104k
Ans d
3. An observer moves towards a stationary source of sound with a velocity one –tenth the velocity of sound. The apparent increase in frequency is:
(a) Zero
(b) 10%
(c) 5%
(d) 0.1%
Ans b
4. The effective length of a magnet is 31.4 cm and its pole strength is 0.5 Am. if it is bent in the form of semicircle, what will be its magnetic moment then?
(a) 0.12Am2
(b) 0.1Am2
(c) 0.05Am2
(d) 0.01Am2
Ans b
5. a proton of energy 2 MeV is moving is a circular path in a magnetic field. what should be the energy of a deuteron, so that it also describes circular path of radius equal to that of the proton ?
(a) 1 MeV
(b) 2 MeV
(c) 4 MeV
(d) 0.5 MeV
Ans a
6. n identical spherical drops each of radius r are charged to same potential v. they combine to form a bigger drop. the potential of the big drop will be:
(a) n1/ 3 V
(b) n2/ 3 V
(c) v
(d) nV
Ans b
7. The wavelength of maximum energy, released during an atomic explosion was 2.93 x10-10 m-k, the maximum temperature attained must be of the order of:
(a) 10-7 k
(b) 107 k
(c) 10-3 k
(d) 5.86 X 10-7 k
Ans b
8. In hydrogen atom when an electron jumps from second to first orbit, the wavelength of line emitted is :
(a) 0.563 Å
(b) 4861 Å
(c) 4102 Å
(d) 1213 Å
Ans d
9. Two identical heaters of 220 V, 1000 W placed in parallel with each other across 220 V line, then the combined power is:
(a) 1000W
(b) 2000W
(c) 500W
(d) 4000W
Ans b
10. If magnetic material moves from stronger to weaker parts of magnetic field, then it is known as:
(a) Anti –ferromagnetic
(b) Ferromagnetic
(c) Diamagnetic
(d) Paramagnetic
Ans c
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