Find here the Most Important NCERT chapter-wise Multiple Choice Questions from Class 10 Science with Answers Pdf free download. this may assist you to understand and check your knowledge about the chapters Most Important MCQ. Students also can take a free test of the Multiple Choice Questions of The chapters Most Important MCQ. Each question has four options followed by the right answer. These Most Important MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

## Q1. The unit of e.m.f. of a cell is

(a) dyne

(b) volt

(c) ampere

(d) joule

(b) volt

## Q2. Kilowatt hour is the unit of

(a) power

(b) energy

(c) impulse

(d) force

(b) energy

## Q3. 1 kWh is equal to

(a) 3.6 × 106 MJ

(b) 3.6 × 105 MJ

(c) 3.6 × 10² MJ

(d) 3.6 MJ

(d) 3.6 MJ

## Q4. Materials which allow larger currents to flow through them are called

(a) insulators

(b) conductors

(c) semiconductors

(d) alloys

(b) conductors

## Q5. Conventionally, the direction of the current is taken as

(a) the direction of flow of negative charge

(b) the direction of flow of atoms

(c) the direction of flow of molecules

(d) the direction of flow of positive charge

(d) the direction of flow of positive charge

## Q6. The unit of specific resistance is

(a) ohm

(b) ohm

(c) ohm-metre

(d) ohm per metre

(c) ohm-metre

## Q7. The variable resistance is called

(a) resistor

(b) rheostat

(c) open switch

(d) none of these

(b) rheostat

## Q8. The SI unit of resistance is

(a) ohm m

(b) ohm m1

(c) ohm

(d) (ohm)-1

(c) ohm

## Q9. Electric power is inversely proportional to

(a) resistance

(b) voltage

(c) current

(d) temperature

(a) resistance

## Q10. What is the commercial unit of electrical energy?

(a) Joules

(b) Kilojoules

(c) Kilowatt-hour

(d) Watt-hour

(c) Kilowatt-hour

## Q11. Three resistors of 1 Ω, 2 ft and 3 Ω are connected in parallel. The combined resistance of the three resistors should be

(a) greater than 3 Ω

(b) less than 1 Ω

(c) equal to 2 Ω

(d) between 1 Ω and 3 Ω

(b) less than 1 Ω

## Q12. An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?

(a) 440 W

(b) 110 W

(c) 55 W

(d) 0.0023 W

(b) 110 W

## Q13. The resistivity of insulators is of the order of

(a) 10-8 Ω-m

(b) 101 Ω-m

(c) 10-6 Ω-m

(d) 106 Ω-m

(a) 10-8 Ω-m

## Q14. 1 kWh = ……….. J

(a) 3.6 × 10-6 J

(b) 13.6 × 106 J

(c) 3.6 × 106 J

(d) 13.6 × 10-6 J

(c) 3.6 × 106 J

## Q15. The electrical resistance of insulators is

(a) high

(b) low

(c) zero

(d) infinitely high

(d) infinitely high

## Q16. Electrical resistivity of any given metallic wire depends upon

(a) its thickness

(b) its shape

(c) nature of the material

(d) its length

(c) nature of the material

## Q17. To get 2 Ω resistance using only 6 Ω resistors, the number of them required is

(a) 2

(b) 3

(c) 4

(d) 6

(b) 3

## Q18. The least resistance obtained by using 2 Ω, 4 Ω, 1 Ω and 100 Ω is

(a) < 100 Ω

(b) < 4 Ω

(c) < 1 Ω

(d) > 2 Ω

(c) < 1 Ω

## Q19. A metallic conductor has loosely bound electrons called free electrons. The metallic

conductor is

(a) negatively charged

(b) positively charged

(c) neutral

(d) Either positively charged or negatively charged

(c) neutral

## Q20. Calculate the current flows through the 10 Ω resistor in the following circuit.

(a) 1.2 A

(b) 0.6 A

(c) 0.2 A

(d) 2.0 A

(b) 0.6 A

## Q21. If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then

(a) R1 < R2

(b) R2 < R1

(c) R1 = R2

(d) R1 ≥ R2

(b) R2 < R1

## Q22. Resistivity of a metallic wise depends on

(a) its length

(b) its shape

(c) its thickness

(d) nature of material

(d) nature of material

## Q23. A coil in the heater consume power P on passing current. If it is cut into halves and joined in parallel, it will consume power

(a) P

(b) P/2

(c) 2P

(d) 4P

(d) 4P

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