Physics Test

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Physics Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

The binary representation of hexadecimal number C3 is

A
1111

B
110011

C
111100

D
11000011

Solution

To convert C3 into hexadecimal, we will write down the respective values of C 12 and 3 into 4-digit binary form.
12 - 1100
3 - 0011
Hence, C3 - 11000011
Question 2
1 / -0

The value of 2⁵ in octal system is

A
40

B
50

C
200

D
400

Solution

2⁵= (32)10
(32)₁₀ = (40)₈
Question 3
1 / -0

In regard to NAND gate the following statements are made.

(1) It is equivalent to an AND gate followed by an inverter.

(2) If all the inputs are low, the output is low.

(3) If all the input is high the output is low.

(4) NAND operation on two elements is equivalent to OR operation on them.

Which of the above statements are correct?

A
1, 2, 3

B
2, 3

C
1,3

D
None of these

Solution

NAND gate is basically AND gate followed by a NOT gate and its truth table is two inputs given below:

Hence only 1 and 3 are true.
Question 4
1 / -0

The expression for exclusive NOR gate is

A

B

C

D
none of these

Solution

Truth table of EX - NOR Gate is

Hence only option 2 satisfies.
Question 5
1 / -0

A
A + B + C

B

C
0

D
1

Solution
Question 6
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 7
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 8
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 9
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 10
1 / -0

A
20 units

B
30 units

C
40 units

D
50 units

Solution
Question 11
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 12
1 / -0

A
80√2 units

B
40√2 units

C

D
8√2 units

Solution
Question 13
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 14
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 15
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