Physics Test 89

Result

Physics Test 89

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Weekly Quiz Competition

Question 1
4 / -1

In series LCR circuit, at resonance, quality factor is high which doesn't means

A
Band width is very small

B
Current v/s frequency has sharp peak

C
Resistance of circuit is very small

D
Inductive reactance is very small

Solution
Question 2
4 / -1

Which of the following represent reactance of LC circuit?

A
1

B
2

C
3

D
4
Question 3
4 / -1

The inductance of a motor of a fan is 0.1 H. It is connected with AC source of 50 Hz. To get the maximum value of power from it, a capacitor is connected in series. Find the value of capacitor.

A
10 μF

B
100 μF

C
1000 μF

D
200 μF

Solution
Question 4
4 / -1

In AC circuit X_L = 4 Ω, X_C = 12 Ω & R = 6 Ω and ac voltage is 100 V, 50 Hz. Then power loss is :

A
600 W

B
1000 W

C
400 W

D
500 W

Solution
Question 5
4 / -1

In AC circuit, E = 220 sin (314 t) volt and i = 2 sin . Then power through AC circuit is :-

A
110 W

B
141 W

C
182 W

D
212 W

Solution
Question 6
4 / -1

If surface absorbs the radiation completely then radiation pressure is given by:

A
2U/C

B
U/C

C
2I/C

D
I/C

Solution
Question 7
4 / -1

Which of the following is not the application infra-red waves:

A
Thermal imaging camera

B
Astronomy

C
Remote signals

D
Sterlising lamps
Question 8
4 / -1

Electric and magnetic field of an electromagnetic wave:

A
Are having a phase difference of 90°

B
Have their planes of oscillations perpendicular to each other

C
Magnetic field is in the direction of polarization of the wave

D
Magnetic field produces optical effects
Question 9
4 / -1

In electromagnetic wave magnetic vector at any instant is in (+y) direction, and electric field (–z) direction then polarization of the wave in:

A
x direction

B
– x direction

C
y direction

D
z direction
Question 10
4 / -1

UV rays coming from the sun are:

(a) absorbed by water in atmosphere

(b) absorbed by ozone layer

(c) transmitted by water vapour

A
Only a

B
Only b

C
a and c

D
b and c