411. If an object is moving with constant acceleration, then the net force acting on it is:
A. Constant
B. Zero
C. Increasing
D. Decreasing
412. LDR becomes essential when an op-amp is used as?
(A) Comparator
(B) Inverter
(C) Calculator
D) Night switch
413. AC plate resistance of a diode value at saturation is?
(A) Infinite
(B) Zero
(C) Depends upon plate potential
D) None of the above
414. For rectifying action, we use?
A) Diode
(B) Choke
(C) Transformer
(D) Capacitor
415. The temperature coefficient of resistance of a semiconductor is?
(A) Positive
B) Negative
(C) Constant
(D) Infinite
416. In an amplifier, the maximum voltage gain is obtained when the load resistance is equal to?
(A) Zero
(B) Infinity
(C) Unity
D) Plate resistance
417. On making grid potential excessively negative, the plate resistance?
A) Becomes infinite
(B) Becomes zero
(C) Remains the same
(D) None of the above
418. The grid is moved closer to the cathode without changing anything; the amplification factor of the valve will?
(A) Decrease
B) Increase
(C) Remains unchanged
(D) First decrease then increase
419. A quantity not always conserved in the decay of elementary particles is?
(A) Baryon number
(B) Lepton number
C) Strangeness number
(D) Electric charge
420. A light year is the distance traveled by light in vacuum in one year, which is numerically equal to:
A. 9.46 Fm
B. 9.46 Gm
C. 9.46 Pm
D. 9.46 Em
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