Physics Test

Result

Physics Test - 14

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Question 1
1 / -0

An AND gate has four inputs A, B, C, D. The input that produces an output 1 is

A
0000

B
1000

C
0001

D
1111

Solution

An AND gate always produces an output 1, only when all the inputs are 1.
Question 2
1 / -0

A

B

C

D
none of these

Solution

We can check from options and only option 2 satisfies the given truth table.
Question 3
1 / -0

If the position of the resultant of two like parallel forces P and Q is unaltered, when the positions of P and Q are interchanged, then

A
P = Q

B
P = 2 Q

C
2 P = Q

D
None of these

Solution
Question 4
1 / -0

A particle moves towards east from a point A to a point B at the rate of 4 km/h and then towards north from B to C at rate of 5 km/h. If AB = 12 km and BC = 5 km, then its average speed for its journey from A to C and resultant average velocity direct from A to C respectively are

A

B

C

D

Solution
Question 5
1 / -0

A
20 units

B
30 units

C
40 units

D
50 units

Solution
Question 6
1 / -0

With two forces acting at a point, the maximum effect is obtained when their resultant is 4N. If they act at right angles, then their resultant is 3N. Then the forces are

A

B

C

D

Solution
Question 7
1 / -0

A
80√2 units

B
40√2 units

C

D
8√2 units

Solution
Question 8
1 / -0

The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the

A
crystal structure

B
variation of the number of charge carriers with temperature

C
type of bonding

D
variation of scattering mechanism with temperature

Solution

There are different charge carriers in case of a metal and a semiconductor. Resistance depends upon the number of charge carriers present. So, resistance variation is there due to charge carrier variation.
Question 9
1 / -0

Consider the following two statements A and B, and identify the correct answer.

A: During amplification, the frequency of the signal is increased.

B: The voltage gain is more in common base transistor amplifier than in common emitter transistor amplifier.

A
Both A and B are true.

B
A is true, but B is false.

C
A is false, but B is true.

D
Both A and B are false.

Solution
Question 10
1 / -0

A transistor is operated in common emitter configuration at constant collector voltage Vc = 1.5 V such that a change in the base current from 100 µA to 150 µA produces a change in the collector current from 5 mA to 10 mA. The current gain (b) is

A
67

B
75

C
100

D
50

Solution