- (A) Water
- (B) Mercury
- (C) Ice
- (D) Copper
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At what temperature will the resistance of a copper wire becomes three times its value at 0 degree centigrade? Temperature coefficient of resistance of copper=4×10-3 per C0?
- (A) 500 C0
- (B) 450 C0
- (C) 400 C0
- (D) 550 C0
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When 9×1013 electrons are removed from a body which has charge of 2.50 µC. What is its charge now?
- (A) -14.4µC
- (B) -2.5µC
- (C) +14.4µC
- (D) +16.9µC
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Rest mass energy of an electron is?
- (A) 0.511×106 eV
- (B) 0.511×109 eV
- (C) 0.511KeV×103 eV
- (D) 0.511eV×103 eV
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A floppy disk in a computer rotates from rest to an angular speed of 31.4 rad/s in time 0.892s. What is the angular acceleration of the disk?
- (A) 14.40 rad/s2
- (B) 0.028 rad/s2
- (C) 35.20 rad/s2
- (D) 56.70 rad/s2
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When silicon is doped with a trivalent impurity it is referred to as?
- (A) Acceptor atoms
- (B) Donor atoms
- (C) Neither A nor B
- (D) Both A & B
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Dopplers effect is the principle understanding?
- (A) Measuring blood flow speeds
- (B) Magnetic imaging
- (C) CT scans
- (D) None of the above
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Colour of light emitted by a LED depends on?
- (A) Its reverse bias
- (B) Its forward bias
- (C) Amount of forward current
- (D) Type of semiconductor material used
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Rate of change of linear momentum p is equal to the?
- (A) Acceleration
- (B) Impulse
- (C) Force
- (D) Velocity