Physics Test 104

Result

Physics Test 104

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Weekly Quiz Competition

Question 1
4 / -1

A sound has intensity of 2 × 10^–8 W/m². Its intensity level (in decibel) is : (log₁₀ 2 = 0.3)

A
23

B
3

C
43

D
4.3

Solution

L = 10 log₁₀ (2 × 10⁴)

= 10 [log₁₀2 + log₁₀ (10⁴)]

= 10 × 4.3 = 43 dB
Question 2
4 / -1

A body is moving forward and backward. Change in frequency observed by the body of a stationary source is 2%. What is velocity of the body ? (V_sound = 300 m/s)

A
6 m/s

B
2 m/s

C
2.5 m/s

D
3 m/s

Solution
Question 3
4 / -1

The displacement-time graphs for two sound wave A and B are shown in the figure, then the ratio of their intensities.

A
1 : 4

B
1 : 16

C
1 : 2

D
1 : 1

Solution
Question 4
4 / -1

In a semiconductor if

A
5/8

B
3/8

C
8/5

D
8/3

Solution
Question 5
4 / -1

When p-n junction is forward biased then :-

A
The depletion region is reduced and barrier height is increase

B
The depletion region is widened and barrier height is reduced

C
both the depletion region and barrier height are reduced

D
both the depletion region and barrier height are increased
Question 6
4 / -1

Directions For Questions

In the given circuit

...view full instructions

The current through the battery is

A
0.5 A

B
1 A

C
1.5 A

D
2 A

Solution
Question 7
4 / -1

In the given circuit, current through the zener diode is :-

A
30 mA

B
24 mA

C
36 mA

D
6mA

Solution
Question 8
4 / -1

In an n-p-n transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector.

A
the emitter current will be 9 mA

B
the emitter current will be 11 mA

C
the emitter current will be 1 mA

D
the base current will be 10 mA

Solution

Since I_E = I_B + I_C. Therefore I_B = I_E - I_C
Question 9
4 / -1

To get an output 1 from the circuit shown in the figure, the input must be :-

A
A = 0, B = 1, C = 0

B
A = 1, B = 0, C = 0

C
A = 1, B = 0, C = 1

D
A = 1, B = 1, C = 0
Question 10
4 / -1

Ohm's law does not hold good for :-

A
Through N-P-N transistor

B
Column of mercury

C
Diode valve

D
Both (1) and (3)

Solution

Ohm's law does not hold good for N-P-N transistor and diode.