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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