Physics Test 137

Result

Physics Test 137

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Weekly Quiz Competition

Question 1
4 / -1

In an oscillating LC circuit, the maximum charge on the capacitor is Q The charge on the capacitor when the energy is stored equally between the electric and magnetic field is

A
Q / 2

B
Q / √3

C
Q / √2

D
Q

Solution
Question 2
4 / -1

A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100 W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 5 m from the lamp will be nearly:

A
1.34 V/m

B
2.68 V/m

C
4.02 V/m

D
5.36 V/m

Solution
Question 3
4 / -1

A
30m

B
60m

C
90m

D
120m

Solution
Question 4
4 / -1

Two identical light waves, propagating in the same direction, have a phase difference d. After they superpose, the intensity of the resulting wave will be proportional to

A

B

C

D

Solution
Question 5
4 / -1

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the materials is:

A

B

C

D

Solution
Question 6
4 / -1

The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is

A
802 nm

B
823 nm

C
1882 nm

D
1648 nm

Solution
Question 7
4 / -1

How does the binding energy per nucleon vary with the increase in the number of nucleons?

A
Increases continuously with mass number

B
Decreases continuously with mass number

C
First decreases and then increases with increase in mass number

D
First increases and then decreases with increase in mass number

Solution
Question 8
4 / -1

The intrinsic conductivity of germanium at 27° is 2.13 mho m^-1 and mobilities of electrons and holes are 0.38 and 0.18 m²v^-1s^-1 respectively. The density of charge carriers is

A

B

C

D

Solution
Question 9
4 / -1

A
t, 0.5

B
t, 1.0

C
t, 1.5

D

Solution
Question 10
4 / -1

The current voltage relation of a diode is given by I = where the applied voltage V is in volts and the temperature T is in degree kelvin. If a student makes an error measuring while measuring the current of 5 mA at 300 K, what will be the error in the value of current in mA?

A
0.2mA

B
0.02mA

C
0.5mA

D
0.05mA

Solution