The Human Eye and the Colourful World
Chemical Reactions and Equations
Control and Coordination
Metal and Non-Metals
How do Organisms Reproduce?
Magnetic Effects of Electric Current
Heredity and Evolution
Our Environment
Life Processes
Carbon and Its Compounds
Periodic Classification of Elements
Light – Reflection and Refraction
Electricity
Acids Bases and Salts
Sources of Energy
Sustainable Management of Natural Resources
Science

Statistics
Real Numbers
Some Applications of Trigonometry
Introduction to Trigonometry
Probability
Constructions
Areas Related to Circles
Circles
Arithmetic Progressions
Pair of Linear Equations in Two Variables
Quadratic Equations
Coordinate Geometry
Surface Areas and Volumes
Polynomials
Triangles
Mathematics

Electricity

**Correct Marks**
1

**Incorrectly Marks**
0

Q 1. Three resistances of {tex}2, 3{/tex} and {tex}5{/tex} {tex} \Omega {/tex} are connected in parallel to a {tex}10{/tex} {tex}\mathrm{V}{/tex} battery of negligible internal resistance. The potential difference across the 3 {tex} \Omega {/tex} resistance will be :

2 V

3 V

5 V

10 V

**Correct Marks**
1

**Incorrectly Marks**
0

Q 2. Charge on an electron is {tex}1.6 \times 10^{-19}{/tex} coulomb. Number of electrons passing through the wire per second on flowing of {tex}1{/tex} ampere current through the wire will be :

{tex}0.625 \times 10^{-19}{/tex}

{tex}1.3 \times 10^{-19}{/tex}

{tex}1.6 \times 10^{-19}{/tex}

{tex}0.625 \times 10^{19}{/tex}

**Correct Marks**
1

**Incorrectly Marks**
0

Q 3. Three resistors are connected to form the sides of a triangle ABC as shown below.

The resistance of side AB is 40 ohms, of side BC 60 ohms and of side CA 100 ohms. The effective resistance between A and B will be :

50{tex} \Omega {/tex}

64{tex} \Omega {/tex}

32{tex} \Omega {/tex}

100{tex} \Omega {/tex}

**Correct Marks**
1

**Incorrectly Marks**
0

Q 4. In the circuit shown in the figure, the current through

The 3 {tex} \Omega {/tex} resistor is 0.50A

The 3 {tex} \Omega {/tex} resistor is 0.25A

The 4 {tex} \Omega {/tex} resistor is 0.50A

The 4 {tex} \Omega {/tex} resistor is 0.25A

**Correct Marks**
1

**Incorrectly Marks**
0

Q 5. Which of the circuit components in the following circuit diagram and connected in parallel?

R{tex}_1{/tex} and R{tex}_2{/tex} only

R{tex}_1{/tex} , R{tex}_2{/tex} and V

R{tex}_2{/tex} and V only

R{tex}_1{/tex} and V only

**Correct Marks**
1

**Incorrectly Marks**
0

Q 6. A cylindrical rod is reformed to twice its length with no change in its volume. If the resistance of the rod was R, the new resistance will be :

R

2 R

4 R

8 R

**Correct Marks**
1

**Incorrectly Marks**
0

Q 7. A wire carries a steady current of 1.0A over a period of 20s. What total charge passes through the wire in this time interval :

200 C

20 C

2.0 C

0.20 C

**Correct Marks**
1

**Incorrectly Marks**
0

Q 8. The length of a wire is doubled and the radius is doubled. By what factor does the resistance change:

4 times as large

twice as large

unchanged

half as large

**Correct Marks**
1

**Incorrectly Marks**
0

Q 9. A 24 V potential difference is applied across a parallel combination of four 6 ohm resistor. The current in each resistor is :

1 A

4 A

16 A

36 A

**Correct Marks**
1

**Incorrectly Marks**
0

Q 10. You are given n identical wires, each of resistance R. When these are connected in parallel, the equivalent resistance is X. When these will be connected in series, then the equivalent resistance will be :

{tex}\mathrm {X/n^2}{/tex}

{tex}\mathrm {n^2X}{/tex}

{tex}\mathrm {X/n}{/tex}

{tex}\mathrm {nX}{/tex}

**Correct Marks**
1

**Incorrectly Marks**
0

Q 11. Three resistors of 4.0{tex} \Omega {/tex}, 6.0{tex} \Omega {/tex} and 10.0{tex} \Omega {/tex} are connected in series. What is their equivalent resistance :

20 {tex} \Omega {/tex}

5 {tex} \Omega {/tex}

6.0 {tex} \Omega {/tex}

4.0 {tex} \Omega {/tex}

**Correct Marks**
1

**Incorrectly Marks**
0

Q 12. Ampere-second stands for the unit of :

Power

Charge

e.m.f.

Energy

**Correct Marks**
1

**Incorrectly Marks**
0

Q 13. If one micro-amp. current is flowing in a wire, the number of electrons which pass from one end of the wire to the other end in one second is :

{tex}6.25 \times 10^{12}{/tex}

{tex}6.25 \times 10^{15}{/tex}

{tex}6.25 \times 10^{18}{/tex}

{tex}6.25 \times 10^{19}{/tex}

**Correct Marks**
1

**Incorrectly Marks**
0

Q 14. If the temperature of a conductor is increased, its resistance will :

Not increase

Increase

Decrease

Change according to the whether

**Correct Marks**
1

**Incorrectly Marks**
0

Q 15. There are two wires of the same length and of the same material and radius r and 2r. The ratio of their specific resistance is :

1 : 2

1 : 1

1 : 4

4 : 1

**Correct Marks**
1

**Incorrectly Marks**
0

Q 16. The resistance 4 R, 16 R, 64 R, .......... {tex} \infty {/tex} are connected in series, their resultant will be :

0

{tex} \infty {/tex}

43 R

34 R

**Correct Marks**
1

**Incorrectly Marks**
0

Q 17. Resistance R, 2R, 4R, 8R, {tex} \infty {/tex} are connected in parallel. Their resultant resistance will be :

R

R/2

0

{tex} \infty {/tex}

**Correct Marks**
1

**Incorrectly Marks**
0

Q 18. The equivalent resistance between points X & Y:

5 {tex} \Omega {/tex}

10 {tex} \Omega {/tex}

15 {tex} \Omega {/tex}

60 {tex} \Omega {/tex}

**Correct Marks**
1

**Incorrectly Marks**
0

Q 19. The equivalent resistance between points X & Y:

4 {tex} \Omega {/tex}

4.5 {tex} \Omega {/tex}

2 {tex} \Omega {/tex}

20 {tex} \Omega {/tex}

**Correct Marks**
1

**Incorrectly Marks**
0

Q 20. A certain wire has a resistance R. The resistance of another wire identical with the first except having twice its diameter is :

2 R

0.25 R

4 R

0.5 R

**Correct Marks**
1

**Incorrectly Marks**
0

Q 21. Masses of 3 wires of same metal are in the ratio 1 : 2 : 3 and their lengths are in the 3 : 2 : 1. The electrical resistances are in ratio :

1 : 4 : 9

9 : 4 : 1

1 : 2 : 3

27 : 6 : 1

**Correct Marks**
1

**Incorrectly Marks**
0

Q 22. A solenoid is at potential difference 60 V and current flows through it is 15 ampere, then the resistance of coil will be :

4 {tex} \Omega {/tex}

8 {tex} \Omega {/tex}

0.25 {tex} \Omega{/tex}

2 {tex} \Omega {/tex}

**Correct Marks**
1

**Incorrectly Marks**
0

Q 23. Which of the following has a negative temperature coefficient?

C

Fe

Mn

Ag

**Correct Marks**
1

**Incorrectly Marks**
0

Q 24. To determine the equivalent resistance of two resistors when connected in series, a student arranged the circuit components as shown in the diagram. But he did not succeed to achieve the objective.

Which of the following mistakes has been committed by him in setting up the circuit?

Position of ammeter is incorrect.

Position of voltmeter is incorrect.

Terminals of ammeter are wrongly connected.

Terminals of voltmeter are wrongly connected.

**Correct Marks**
1

**Incorrectly Marks**
0

Q 25. The following circuit diagram shows the experimental set-up for the study of dependence of current on potential difference. Which two circuit components are connected in series?

Battery and voltmeter

Ammeter and voltmeter

Ammeter and Rheostat

Resistor and voltmeter

Your request has been placed successfully.