Physics Test 210

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Physics Test 210

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Question 1
4 / -1

When a rubber band is stretched by a distance x, it exerts a restoring force of magnitude F = ax + bx², where a and b are constants. The work done in stretching the unstretched rubber band by L is

A

B

C

D

Solution
Question 2
4 / -1

Assertion It is not possible for a system, unaided by an external agency to transfer heat from a body at lower temperature to another body at higher temperature.

Reason According to Clausius statement, \"No process is possible whose sole result is the transfer of heat from a cooled object to a hotter object.

A
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

B
If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.

C
If Assertion is true but Reason is false.

D
If the Assertion and Reason both are false.
Question 3
4 / -1

In a capacitor which is initially charged such that the left plate of capacitor has charge +Q and the right plate has zero charge at time t = 0 s. The total charge on the right plate after closing the switch will be

A

B

C

D
-CV

Solution
Question 4
4 / -1

Consider a common-base amplifier made by a PNP transistor, the current gain is 0.96 and emitter current is 7.2 mA. The base current is

A
0.4 mA

B
0.2 mA

C
0.29 mA

D
0.35 mA

Solution

Given,

Emitter current, I_E = 7.2 mA.

Let's take,

IB → IB → Base current and

IC → IC → Collector current.
Question 5
4 / -1

In an AC circuit, which has unknown electrical devices connected in series having resistance 3 Ω, the power factor is 3/5. The resistance of circuit is

A
1Ω

B
3Ω

C
4Ω

D
5Ω

Solution
Question 6
4 / -1

For the given combination of gates, if the logic gates of inputs A, B and C are as follows. A=B=C =0 and A=B=1, C=0. Then, the logic gates of output D are

A
0, 0

B
0, 1

C
1, 0

D
1, 1

Solution

The output D for the given combination,
Question 7
4 / -1

Given combination of NAND gates will be equivalent to,

A
NOR gate

B
OR gate

C
AND gate

D
XOR gate

Solution
Question 8
4 / -1

The collector current is 10 mA in n-p-n transistor. If 80% electrons emitted reach the collector then:

A
The emitter current will be 5.5 mA

B
The emitter current will be 12.5 mA

C
The base current will be 4.5 mA

D
The base current will be 3.5 mA

Solution
Question 9
4 / -1

Find the angular speed of the meter stick, when a person throws it such that the centre of the stick is moving with a speed of 10 m s^-1 vertically upwards & left end of stick with a speed of 20 m s^-1 vertically upwards.

A
20 rad s^-1

B
10 rad s^-1

C
30 rad s^-1

D
None of these

Solution

Given velocity of centre C of the rod, v_C = 10 m s⁻¹

and velocity of end A of the rod v_A= 20 m s⁻¹

Let ω be the angular velocity of the rod.

Since v_A > v_C, thus the stick will rotate in clockwise direction.

Now using the relation, v_A − v_C = ωr, we get,

⇒ 20 − 10 = ω(l/2)

⇒10 = ω/2 rad s⁻¹

⇒ ω = 20 rad s^-1

Hence, the angular speed of the stick is 20 rad s⁻¹.
Question 10
4 / -1

Find the current flowing in the primary coil, if the secondary coil of an ideal step down transformer is delivering 500 W power at 12.5 A current. The ratio of turns in the primary to the secondary is 5:1.

A
62.5 A

B
2.5 A

C
6A

D
0.4 A

Solution