10th science Chapter 12 objective English medium
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Chapter 11 human eye and colorful world
VENUS BHATNAGAR SCIENCE INSTITUTE INDORE
CHAPTER - 12
( ELECTRICITY )
Question 1. SI unit of an electric current is equal to
(a) 6 × 108 C
(b) 9.8 × 1010 C
(c) 1.6 × 10-19 C
(d) None of these
Answer: (d) None of these
Question 2. Which materials have changing resistivity?
(a) Conductors
(b) Semiconductors
(c) Non-metals
(d) Super metals
Answer: (b) Semiconductors
Question 3. If wire in a circuit is doubled its resistivity will be?
(a) Two times
(b) Ten times
(c) Zero
(d) half
Answer: (d) half
Question 4. A wire used in circuit must be
(a) Highly resistant
(b) Non resistance
(c) Have high melting point
(d) None of these
Answer: (b) Non resistance
Question 5. A heating w ire must have
(a) High melting point
(b) High conductivity to heat
(c) Both
(d) None
Answer: (b) High conductivity to heat
Question 6. SI unit of resistance is:
(a) Coulomb
(b) Ampere
(c) Ohm
(d) Ohm – meter
Answer: (c) Ohm
Question 7. Relation of potential difference and current is represented by:
(a) Joule’s law
(b) Ohm’s law
(c) Dalton’s law
(d) None
Answer: (b) Ohm’s law
Question 8. Formula which represents the relation among potential difference and current following in a circuit is:
(a) V = IR
(b) V = I/R
(c) l = Q/t
(d) R = p
Answer: (a) V = IR
Question 9. Kilo watt is a unit for:
(a) Power
(b) Electrical energy commercial
(c) Resistance
(d) Current flow in circuit
Answer: (a) Power
Question 10. Which one has less resistance?
(a) 10 watt bulb
(b) 15 watt LED
(c) 60 watt bulb
(d) 60 watt LED.
Answer: (a) 10 watt bulb
Question 11. In which type of combinations resistance is more?
(a) Series Combination
(b) Parallel combination
(c) both
(d) Single resistance unit.
Answer: (a) Series Combination
Question 12. Joule’s law formulation is
(a) H = IRT
(b) H = I2RT
(c) P = VI
(d) RT = PV
Answer: (d) RT = PV
Question 13. Hardest metal which can resist maximum heat is:
(a) Lead
(b) Tungsten
(c) Silver
(d) Carbon
Answer: (b) Tungsten
Question 14. If current passing a circuit is 10 A and wire is connected to 100 volt line resistant in the wire will be:
(a) 10 A
(b) 10 Ω
(c) 100 Ω
(d) O Ω
Answer: (b) 10 Ω
Question 15. An insulator has a resistivity equals to:
(a) 10-8 Ω m
(b) 10 Ω m
(c) 5 Ω m
(d) 10-18 Ω
Answer: (a) 10-8. Ω m
Question 16. If resistors are arranged in parallel with value 1 Ω, 2 Ω and 3 Ω Total resistant will be:
(a) more than 3 Ω
(b) less than 3 Ω
(c) less than 1 Ω
(d) equal to 1 Ω
Answer: (b) less than 3 Ω
Question 17. The changing 1 kWh to joule will be equal to
(a) 3.6 × 106 J
(b) 3.6 × 10-6 J
(c) 1.6 × 106 J
(d) 1 × 106 J
Answer: (a) 3.6 × 106 J
For chapter 13 click here 👇👇
Chapter 13 magnetic effect of current
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