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Quiz 1
Mdcat-past-papers - DUHS - Physics Quiz
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Board: DUHS | Subject: Physics |
1. The ohm's law is applicable if:
Temp becomes infinite
Temp increases
Temp decreases
Temp remains same
2. Which of the following refers to the DC current that does not change its intensity?
Eddy current
Surge current
Leakage current
Steady current
3. The SI unit of electric charge:
Ohm
Farad
Coulomb
Ampere
4. Resistors of 5Ω and 10Ω are connected in parallel. If the potential difference across 5Ω resistor is 20V, then current through 10Ω will be:
0.5 A
30 A
2:00 AM
10:00 AM
5. A conducting wire of resistivity ρ is cut into two equal parts. The resistivity of each part will be:
The same
One fourth
√2 times
Halved
6. Four cells of emf 3V are connected in series to form a battery. Net emf of the combination is:
12 V
1.33 V
9 V
7 V
7. The electrical energy dissipated as heat in a resistor is:
I²R
I²Rt
FR
IRt
8. When different resistors are connected across the terminal of a battery:
Both emf and terminal potential difference become zero
Both emf and potential difference changes
The emf changes but terminal potential difference remains same
Both emf and terminal potential difference remain the same
9. A soft cylindrical conducting wire has resistance R. It is stretched so its length is doubled but its radius remains constant. What is the new resistance?
R/2
R
4R
2R
10. The internal resistance of a battery is:
In parallel to the external load
In series to the external load
Not connected to the external load
Zero
11. The electric potential across the terminals of a battery is called:
Potential difference
EMF
Internal potential group
Terminal voltage
12. When a body moves with uniform velocity then its:
Average velocity is zero
Instantaneous velocity is greater than average velocity
Instantaneous velocity is equal to average velocity
Instantaneous velocity is less than average velocity
13. A box of mass m = 6 kg slides with speed v = 4 m/s across a frictionless floor. It suddenly explodes into two pieces. One piece with mass m = 2 kg moves in the same direction with speed v₁ = 8 m/s. The velocity v₂ of the second piece is:
6 m/s
1 m/s
3 m/s
2 m/s
14. The rate of change of linear momentum of a body is equal to:
Net force
Net displacement
Net torque
Net inertia
15. What will be the value of acceleration if a body of mass 0.5 kg is acted upon by a force of 10 N?
40 m/s²
5 m/s²
30 m/s²
20 m/s²
16. What is the time rate of change of linear momentum?
Acceleration
Force
Velocity
Work
17. A helicopter is ascending with zero acceleration. The apparent force 'F' on it is:
F = 0
F = √W
F < W
F = W
18. A bullet is fired horizontally with 20 m/s. In the absence of air friction its horizontal velocity after 2 seconds will be:
10 m/s
20 m/s
60 m/s
80 m/s
19. A body is dropped from certain height and falls freely. Its velocity after 5 seconds will be:
94 m/s
9.4 m/s
0.49 m/s
4.9 m/s
20. A ball is thrown horizontally with 19.6 m/s. After 2 seconds its horizontal velocity component will be:
4.9 m/s
9.8 m/s
19.6 m/s
39.2 m/s
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