FSc physics

Written by Dr. Hamza Farooq (Physics)

GIKI · طبیعیات · 30 سوالات

نام: ____________________ تاریخ: ____________

The SI unit of force is the:
- A Newton
- B Joule
- C Pascal
- D Watt
A 2 kg body accelerates at 3 m/s². The net force on it is:
- A 6 N
- B 9 N
- C 1.5 N
- D 5 N
A body is dropped from rest. Taking g = 10 m/s², its speed after 3 s is:
- A 45 m/s
- B 15 m/s
- C 10 m/s
- D 30 m/s
A current of 2 A flows through a 5 Ω resistor. The potential difference is:
- A 10 V
- B 2.5 V
- C 0.4 V
- D 7 V
The kinetic energy of a 4 kg body moving at 5 m/s is:
- A 20 J
- B 50 J
- C 100 J
- D 10 J
The time period of an alternating current of frequency 50 Hz is:
- A 0.5 s
- B 0.02 s
- C 50 s
- D 0.2 s
Which of these is a vector quantity?
- A Velocity
- B Time
- C Mass
- D Speed
Heat can travel through a vacuum by:
- A Evaporation
- B Convection
- C Conduction
- D Radiation
A force of 10 N moves a body 5 m in its own direction. The work done is:
- A 15 J
- B 2 J
- C 0.5 J
- D 50 J
Two resistors of 4 Ω and 6 Ω are joined in parallel. The equivalent resistance is:
- A 1.5 Ω
- B 2.4 Ω
- C 5 Ω
- D 10 Ω
The SI unit of pressure is the:
- A Newton
- B Joule
- C Watt
- D Pascal
The momentum of a 2 kg body moving at 4 m/s is:
- A 6 kg m/s
- B 8 kg m/s
- C 16 kg m/s
- D 2 kg m/s
A projectile launched at the same speed has the greatest range when the angle of launch is:
- A 30°
- B 60°
- C 90°
- D 45°
A sound wave of frequency 500 Hz travels at 340 m/s. Its wavelength is:
- A 170 m
- B 1.47 m
- C 0.68 m
- D 0.5 m
An object is placed at twice the focal length of a convex lens. The image is:
- A Real and magnified
- B Real, inverted and the same size
- C Real and diminished
- D Virtual and upright
The heat needed to raise 2 kg of water by 5°C (c = 4200 J/kg°C) is:
- A 4200 J
- B 21000 J
- C 8400 J
- D 42000 J
The SI unit of magnetic flux is the:
- A Henry
- B Tesla
- C Gauss
- D Weber
A 12 V battery is connected across a 4 Ω resistor. The current is:
- A 0.33 A
- B 8 A
- C 3 A
- D 48 A
A 60 W bulb is used for 5 hours. The energy used is:
- A 3 kWh
- B 12 kWh
- C 0.3 kWh
- D 0.03 kWh
A body moves in a circle of radius 5 m at 10 m/s. Its centripetal acceleration is:
- A 5 m/s²
- B 2 m/s²
- C 50 m/s²
- D 20 m/s²
The gravitational potential energy of a 3 kg body at 10 m (g = 10 m/s²) is:
- A 13 J
- B 3000 J
- C 30 J
- D 300 J
When a source of sound moves toward a listener, the listener hears:
- A The same frequency
- B A lower frequency
- C A higher frequency
- D No sound
Total internal reflection can occur when light travels from:
- A Air to glass
- B A denser medium to a rarer medium
- C A rarer medium to a denser medium
- D Air to water
An alpha particle consists of:
- A 1 proton and 2 neutrons
- B 1 proton and 1 neutron
- C 2 electrons
- D 2 protons and 2 neutrons
The energy stored in a 2 μF capacitor charged to 100 V is:
- A 0.02 J
- B 0.01 J
- C 1 J
- D 0.2 J
Resistors of 3 Ω, 4 Ω and 5 Ω in series have a total resistance of:
- A 5 Ω
- B 60 Ω
- C 1.28 Ω
- D 12 Ω
In simple harmonic motion, the acceleration is:
- A Constant
- B Proportional to the speed
- C Proportional to the displacement and opposite to it
- D Zero at the ends
The first law of thermodynamics is written as:
- A ΔU = Q − W
- B Q = ΔU × W
- C ΔU = QW
- D ΔU = Q + W + 1
The moment of a 10 N force acting at 0.5 m from the pivot, at right angles to the arm, is:
- A 5 N m
- B 10.5 N m
- C 0.05 N m
- D 20 N m
The speed of light in vacuum is about:
- A 3 × 10¹⁰ m/s
- B 3 × 10⁸ m/s
- C 3 × 10⁶ m/s
- D 340 m/s

جوابی کلید

1. A, 2. A, 3. D, 4. A, 5. B, 6. B, 7. A, 8. D, 9. D, 10. B, 11. D, 12. B, 13. D, 14. C, 15. B, 16. D, 17. D, 18. C, 19. C, 20. D, 21. D, 22. C, 23. B, 24. D, 25. B, 26. D, 27. C, 28. A, 29. A, 30. B

One newton is one kilogram metre per second squared.
F = ma = 2 × 3 = 6 N.
v = gt = 10 × 3 = 30 m/s.
V = IR = 2 × 5 = 10 V.
KE = ½ × 4 × 25 = 50 J.
T = 1 ÷ f = 1 ÷ 50 = 0.02 s.
Velocity has both magnitude and direction.
Conduction and convection need matter, and radiation does not.
W = Fd = 10 × 5 = 50 J.
The resistance is (4 × 6) ÷ (4 + 6) = 2.4 Ω.
One pascal is one newton per square metre.
Momentum = mass × velocity = 8.
The range is proportional to sin 2θ, which is greatest at 45°.
λ = v ÷ f = 340 ÷ 500 = 0.68 m.
At 2f the image forms at 2f and has the same size.
Q = mcΔT = 2 × 4200 × 5 = 42000 J.
One weber is one tesla metre squared.
I = V ÷ R = 12 ÷ 4 = 3 A.
The energy is 60 W × 5 h = 300 Wh = 0.3 kWh.
The acceleration is v² ÷ r = 100 ÷ 5 = 20 m/s².
PE = mgh = 3 × 10 × 10 = 300 J.
This is the Doppler effect.
The angle of incidence must pass the critical angle in the denser medium.
It is the nucleus of a helium atom.
E = ½CV² = ½ × 2×10⁻⁶ × 10⁴ = 0.01 J.
Series resistances add.
The restoring acceleration is a = −ω²x.
The change in internal energy is the heat added minus the work done by the system.
The moment is force × distance = 5 N m.
This is a standard constant.