Physics Test 149

Result

Physics Test 149

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Weekly Quiz Competition

Question 1
4 / -1

In a half-wave rectifier, the minimum number of diode(s) used

A
1

B
2

C
3

D
4

Solution

In a half wave rectifier the minimum number of diode can be used is one.
Question 2
4 / -1

Minimum resistance of a diode occurs in

A
reverse bias

B
forward bias

C
cut-off region

D
None of these

Solution

An actual diode offers a very small resistance (non-zero) when forward biased is called forward resistance, whereas, it offers a very high resistance (non-infinite) when reverse biased and is called as reverse resistance.
Question 3
4 / -1

Find the value of current in the figure, if junction diode is ideal.

A
Zero

B

C
10^-1 A

D

Solution
Question 4
4 / -1

The relation between number of free electrons (n) is a semiconductor and temperature (T) is given by

A

B

C

D

Solution
Question 5
4 / -1

A piece of copper and other of germanium are cooled from the room temperature to 80 K, then

A
resistance of each will increase

B
resistance of each will decrease

C
the resistance of copper will increase, while that of germanium will decrease

D
the resistance of copper will decrease, while that of germanium will increase

Solution

Copper is a metal whereas germanium is a semiconductor. Thus, when they are cooled, the resistance of copper will decrease but that of germanium will increase.
Question 6
4 / -1

If the temperature of the source is increased the efficiency of a Carnot engine

A
increase

B
decreases

C
remains constant

D
first increase and then remains constant

Solution
Question 7
4 / -1

A charged particle moves through a magnetic field in a direction perpendicular to it. Then the: –

A
speed of the particle remains unchanged

B
direction of motion of particle remains unchanged

C
acceleration of particle remains unchanged

D
velocity of particle remains unchanged

Solution
Question 8
4 / -1

A square loop of side 22 cm is changed to a circle in time 0.4 s. The magnetic field present is 0.2 T. The emf induced is:

A
–6.6 mV

B
–13.2 mV

C
+6.6 mV

D
+13.2 mV

Solution
Question 9
4 / -1

A
10⁴watt

B
10 watt

C
2.5 watt

D
5.0 watt

Solution
Question 10
4 / -1

A radio wave has a maximum magnetic field induction of 10^–4 T on arrival at a receiving antenna. The maximum electric field intensity of such a wave is -

A
zero

B
3 × 10⁴ V/m

C
5.8 × 10^–9 V/m

D
3.3 × 10^–13 V/m

Solution