physics

For semi conductor to have negative temperature coefficient of resistance implies that?

A. their resistance decrease with temperature B. The resistance increase with temperature C. their resistance is constantly changing with temperature…

4 years ago

An a.c circuit of e.m.f 12V has a resistor of resistance 8Ω connected in series to an inductor of inductive reactance 16Ω and a capacitor capacitive reactance 10Ω. The current flow in the circuit is?

A. 1.4A B. 1.2A C. 12.0A D. 14.0A Correct Answer: Option B - 1.2A

4 years ago

A radioisotope has a decay constant of 10^−7s‾¹. The average life of the radioisotope is?

A. 1.00 x 107s B. 6.93 x 106s C. 1.00 x 10-7s D. 6.93 x 107s Correct Answer: Option B…

4 years ago

A generator manufacturing company was contracted to produce an a.c dynamo but inadvertently produced a d.c dynamo. To correct this error, the

A. armature coil should be made of silver B. commutator should be replaced with slip ring C. commutator should be…

4 years ago

The binding energy of helium 4//2He is?

[atomic mass of proton = 1.00783U, atomic mass of neutron = 1.00867U] A. 4.033U B. 2.017U C. 0.033U D. 0.330U…

4 years ago

In a reverse biased junction diode; current flows in by?

A. positive holes alone B. majority carriers C. electron alone D. minority carriers Correct Answer: Option D = minority carriers…

4 years ago

The particle and wave nature of matter are demonstrated in the equation?

A. λ = hc/E B. λ = h/P C. λ = c/f D. λ = 2 d sin θ Correct…

4 years ago

A moving coil galvanometer has a full-scale deflection of 3A equivalent to 30° deflection. The sensitivity of the instrument is?

A. 33.0 B. 0.1 C. 90.0 D. 10.0 Correct Answer: Option D = 10.0 Explanation Sensitivity of a measuring instrument…

4 years ago

An elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. The original length of the string is?

A. 12cm B. 20cm C. 18cm D. 15cm Correct Answer: Option C - 18cm

4 years ago

If two inductors of inductances 3H and 6H are arranged in series; the total inductance is?

A. 9.0H B. 18.0H C. 0.5H D. 2.0H Correct Answer: Option A - 9.0H Explanation l =l1 + l2 =…

4 years ago
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