Question 1

Which of the follwing statement is correct?

Accepted Answer

Potentiometer is used to measure internal resistance in acircuit.

Answer

Potentiometer is used to measurecurrent in a circuit.

Answer

Potentiometer is used to measure the p.d across a resistor.

Answer

Potentiometer is used to measure resistance in a circuit.

Question 2

What is meant by 80/20 Nichrome?

Accepted Answer

20% Chromium and 80% Nickel

Answer

Purity 80% and impurity 20 %

Answer

None

Answer

80% Chromium and 20% Nickel

Question 3

Two resistances are connected in two gaps of meterbridge. The balanceis 10 cm from the zero end. A resistance of 20 ohm is connected in series with the smaller of the two. The nullpoint shifts to 20 cm. What is the value of bigger resistance?

Accepted Answer

144 ohm

Answer

none

Answer

100 ohm

Answer

89 ohm

Question 4

Kirchoff's voltage law is based on the law of conservation of

Accepted Answer

energy

Answer

Charge

Answer

momentum

Answer

mass

Question 5

What is the potential difference between points A and B in the following circuit?

Accepted Answer

5 V

Answer

2.5 V

Answer

20 V

Answer

10 V

Question 6

In a meter bridge,what is the effect on null point of the galvanometer, whenthe radius of the meterbridge wire is doubled?

Accepted Answer

There will be no change

Answer

Null pointwill shift to L/2

Answer

Null point will shift to L/4

Answer

Null point will shift to 2L

Question 7

Which of the following characteristics of electrons determines the current in the circuit?

Accepted Answer

Only drift velocity

Answer

thermal velocity only

Answer

neither drift velocity nor thermal velocity

Answer

drift velocity and thermal velocity

Question 8

What is the ratio of power dissipated if two electricbulbs are connected in series and the ratio of their resistance is 1:2?

Accepted Answer

1:2

Answer

2:1

Answer

1:4

Answer

1: 1

Question 9

A 50 V batteryis connected acrossa 10 Ω resistor and a currentof 4 .76 A flows. The internal resistance of the batteryis

Accepted Answer

0.5 Ω

Answer

0.3 Ω

Answer

0.2 Ω

Answer

0.1 Ω

Question 10

The ratio of voltage and electrical currentin a closed circuit:

Accepted Answer

Remains constant

Answer

Decreases

Answer

Increases

Answer

Varies

Question 11

When one of three seriesresistors is removed from a circuit and the circuit is reconnected, the current

Accepted Answer

increases

Answer

None of the above

Answer

decreases by half

Answer

increases by half

Question 12

When three identicalbulbs of 60 W, 200 V rating are connected in series to a 200 V supply, the power drawn by them will be:

Accepted Answer

20 W

Answer

180 W

Answer

60 W

Answer

10 W

Question 13

Ohm’s law is valid when the temperature of conductor is :

Accepted Answer

constant

Answer

very high

Answer

varying

Answer

very low

Question 14

How many joules are equal to I kWh ?

Accepted Answer

3.6 × 10^6

Answer

3.6 × 10^5

Answer

3.6 × 10^4

Answer

None of these

Question 15

In an experiment with potentiometer, null point with a cell is found at 240 cm. When the cell is shunted with a resistance 2 Ω, the null point becomes 120 cm internal resistance of cell is

Accepted Answer

2 Ω

Answer

12 Ω

Answer

4 Ω

Answer

1 Ω

Question 16

A wire P is half the diameter and half the length of a wire Q of similar material. The ratio of resistances of P to that Q is

Accepted Answer

2 : 1

Answer

8 : 1

Answer

1 : 2

Answer

4 : 1

Question 17

The resistance of a wire is 10 ohm. It is stretched so that its length becomes four times. What will be the new resistance of the wire?

Accepted Answer

40 cm

Answer

120 ohm

Answer

160 ohm

Answer

160.5 ohm

Question 18

Four identical cellseach having an e.m.f.of 4V are connected in parallel. What will be the e.m.f. of this combination?

Accepted Answer

4 V

Answer

1 V

Answer

16 V

Answer

1/4 V

Question 19

Radio waves and gamma waves are both transverse in nature and electromagnetic in character and have the same speedin vacuum. In what respects are they different?

Accepted Answer

Both, (a) and (b)

Answer

None of these

Answer

Frequency

Answer

wavelength

Question 20

Point out the wrong statement about EM Waves

Accepted Answer

travel with the same speed in all media

Answer

are transverse

Answer

are produced by accelerating charged particles

Answer

they have certain amount of energy associated with them.

Question 21

Frequency of a wave is 6 × 10^15 Hz. The wave is ____

Accepted Answer

Ultra violet

Answer

X-ray

Answer

Microwave

Answer

Radiowave

Question 22

Who first demonstrated the existence of EM waves?

Accepted Answer

Hertz

Answer

Faraday

Answer

Ampere

Answer

Maxwell

Question 23

In electromagnetic waves the phase difference between electric field vector and magnetic field vector is _______

Accepted Answer

zero

Answer

π/3

Answer

π/2

Answer

π

Question 24

Electromagnetic waves are produced by ______

Accepted Answer

An accelerated charge

Answer

Charged particles

Answer

A static charge

Answer

A moving charge

Question 25

Which electromagnetic radiation has wavelength greater than that of X-rays and smaller than that of visiblelight?

Accepted Answer

Ultra Violet Rays

Answer

Radio waves

Answer

Infra Red Rays

Answer

Microwaves

Question 26

In a potentiometer experiment, it is found that nocurrent passes through the galvanometer when the terminals of the cell are connectedacross 52 cm of the potentiometer. If the cell is shunted by resistance of 5 ohm abalance point is foundwhen the cell is connected across 40 cm wire. Find the internal resistance

Accepted Answer

1.5 ohm

Answer

2 ohm

Answer

2.5 ohm

Answer

1 ohm

Question 27

On interchanging the resistances, the balance point of a meter bridge shifts to left by 10 cm. The resistance of their series combination is 1K ohm. how much was the resistance on the left slot before interchanging resistances?

Accepted Answer

550 ohm

Answer

990 ohm

Answer

505 ohm

Answer

910 ohm

Question 28

In the adjoining fig, the emf of the cell is 2 V and internal resistane is negligible. The resistance of Voltmeter is 80 ohm. The reading of voltmeter would be _____

Accepted Answer

1.33 V

Answer

2 V

Answer

0.80 V

Answer

1.60 V

Question 29

A voltmeter has resistance 2000 ohms and it can measure upto 2 V. If we want to increase the range to 10 V,then required resistance in series would be ___

Accepted Answer

8000 ohm

Answer

2000 ohm

Answer

6000 ohm

Answer

4000 ohm

Question 30

Arrange the following electromagnetic waves in the order of increasing energy

A: Blue light ; B: yellow light ; C : X-Rays; D- Radio Waves

Accepted Answer

D,B,A,C

Answer

C,A.B,D

Answer

B,A,D,C

Answer

A,B,D,C

Question 31

An ionizing chamberwith conducting plateshas a cathode and an anode has 5x10^7 electrons and same number of single charged positive ions / cm^3.The current density from cathode to anode is 4x10^-6 A/m^3. the velocity of positive ions moving towards cathode is

Accepted Answer

zero

Answer

16 m/s

Answer

0.4 m /s

Answer

0.1 m/s

Question 32

A potentiometer is properly set the balancing length(L) for a cell is obtained. If the current through thepotentiometer wire is decreased, then the balancing length

Accepted Answer

is increased

Answer

becomes half

Answer

is decreased

Answer

is not changed

Question 33

Emf of a cell is

Accepted Answer

The maximum potential difference between the terminals of a cell when no current is drawn from the cell.

Answer

the force required to push the electrons in the circuit.

Answer

less than terminal potential difference of the cell

Answer

the potential difference between the positive and negative terminal of a cell in a closed circuit.

Question 34

In a region of constant potential

Accepted Answer

both the electric field is zero and there can be no charge inside the region.

Answer

the electric field is uniform.

Answer

the electric field is zero.

Answer

there can be no charge inside the region.

Question 35

An electric cell is passed through a circuit containing two wires of same material , conneted in parallel .If the lengths and the radii of the wires are in the ratio of 3:2 and 2:3 respectively. then the ratio of current passing through the wires will be _____

Accepted Answer

8:27

Answer

3:4

Answer

27:8

Answer

4:3

Question 36

Dielectric constant for a metal is

Accepted Answer

infinite

Answer

zero

Answer

10

Answer

1

Question 37

Two identical capacitors are joined in parallel, charged to a potential V, separated and then connected in series, the positive plate of one is connected to the negative of the other. Which of the following is true?

Accepted Answer

The potential difference between the free plates is 2V.

Answer

The potential difference remains constant.

Answer

The energy stored in ths system increases.

Answer

The charges on the free plated connected to-gether are destroyed.

Question 38

In which of the following forms is the energy stored in a capacitor?

Accepted Answer

Electric field

Answer

Capacitance

Answer

Charge

Answer

Potential

Question 39

An electron initially at rest is accelerated through a potential difference of one volt. The energy gained by electron is:

Accepted Answer

1.6 × 10^-19 J

Answer

None of these

Answer

1 J

Answer

10-19 J

Question 40

Choose the SI unit of electric potential energy :

Accepted Answer

Joule

Answer

Erg

Answer

Netwon per coulomb

Answer

Coulomb

Related quizzes

Related quizzes