Time Left:
600
sec
1. Resistance of a wire depends on –
A. Length only
B. Area only
C. Material only
D. Length, area, material
3. Nichrome is an alloy of –
A. Cu and Zn
B. Ni, Cr, Mn, Fe
C. Cu, Ni, Mn
D. Fe, Al, Zn
5. The resistance of a wire is given by –
A. R = ρA/l
B. R = ρl/A
C. R = A/ρl
D. R = V/I
6. The total resistance in series is –
A. R₁ + R₂ + R₃
B. (R₁R₂)/(R₁+R₂)
C. 1/R₁ + 1/R₂
D. R₁R₂R₃
7. The current in series combination of resistors is –
A. Different in each
B. Same in each
C. Zero
D. Inversely proportional to resistance
8. The potential difference across a series combination is –
A. Same across each resistor
B. Sum of voltages across each resistor
C. Product of resistances
D. Zero
9. In parallel combination of resistors, the reciprocal of equivalent resistance is –
A. R₁+R₂+R₃
B. 1/R₁ + 1/R₂ + 1/R₃
C. (R₁R₂)/(R₁+R₂)
D. R₁R₂R₃
10. The total current in a parallel combination is –
A. Equal to one branch current
B. Sum of currents in each branch
C. Zero
D. Divided equally irrespective of resistance
11. In parallel, the potential difference across each resistor is –
A. Different
B. Same
C. Proportional to resistance
D. Zero
12. Advantage of parallel combination of appliances is –
A. Same current flows
B. Same resistance value
C. Each appliance gets same potential difference
D. Current divides unequally
13. The heating effect of current is used in –
A. Electric fan
B. Electric iron
C. Generator
D. Transformer
14. Heat produced in a resistor is given by –
A. H = I²Rt
B. H = V²/Rt
C. H = V/I
D. H = VI/t
15. Heat produced is directly proportional to –
A. Square of current
B. Inverse of resistance
C. Cube of voltage
D. Time²
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