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Quiz 1
Mdcat-past-papers - NUMS Quiz
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Board: NUMS |
1. A DC power supply is connected in series to resistor R = 30Ω and capacitor C = 1F. If emf is 9V, then max charge Q₀ and time to attain Q₀:
Q₀ = 1C, t = 3s
Q₀ = 3C, t = 3s
Q₀ = 9C, t = 15s
Q₀ = 9C, t = 3s
2. The magnitude of the current in metals is proportional to the applied voltage as long as temperature is constant. It is statement of:
Joule's law
Gauss's law
Ohm's law
Ampere's law
3. Volt × Ampere is the unit of:
Current
Resistance
Volt
Power
4. If length of the wire becomes two times and area becomes half, then the resistance of the wire becomes:
Double
Four times
One half
One fourth
5. The temperature coefficient of a semiconductor is negative because:
Resistance increases with temperature
Resistance decreases with temperature
Resistance decreases with decrease in temperature
Resistance remains same with increase in temperature
6. The resistance of a wire is 6Ω at 50°C and 8Ω at 100°C. The resistance at 0°C is:
5Ω
4Ω
3Ω
2Ω
7. A wire is stretched so that its radius becomes half. The resistance becomes:
4R
R/4
8R
16R
8. The resistance of pure metal increases with:
Increase in temperature
Decrease in temperature
Increase in pressure
Decrease in pressure
9. If length becomes double and area becomes half, the resistance becomes:
Double
One half
Four times
One fourth
10. Which graph explains non-ohmic material whose resistance decreases?
Graph A
Graph B
Graph C
Graph D
11. Equivalent resistance between points A and B is:
3/2 Ω
1/3 Ω
3Ω
2/3 Ω
12. The substances having negative temperature coefficient are:
Insulators
Conductors
Semiconductors
Alloys
13. An electric bulb is marked 200W, 220V. If the same bulb is connected to 110V supply line, the power consumed by it is:
100W
75W
50W
25W
14. Terminal voltage "V" of the battery is greater than emf of the battery when:
Battery is charging
Battery is discharging
Battery is connected with R
Battery is connected with voltmeter
15. The power of an electric bulb is 100W. It is connected to 110V power supply. The resistance of electric bulb will be:
110 ohm
121 ohm
20 ohm
2000 ohm
16. Power transfer will be maximum when:
R>r
R<r
R=r
R=1/r
17. The time rate of change of velocity is:
Force
Acceleration
Power
Energy
18. Plasma membrane is named so because it surrounds:
Semi fluid cell content
Protoplasm
Cell wall
None
19. Which is not a basic unit of cell:
Cell wall
Cell membrane
Nucleus
Ribosomes
20. Cell wall is synthesized by:
Cellulose
Cell
Ribosome
Penicillin binding protein
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