FSc physics

The SI unit of force is the:

• 1 Newton
• 2 Joule
• 3 Pascal
• 4 Watt

A 2 kg body accelerates at 3 m/s². The net force on it is:

• 1 6 N
• 2 9 N
• 3 1.5 N
• 4 5 N

A body is dropped from rest. Taking g = 10 m/s², its speed after 3 s is:

• 1 45 m/s
• 2 15 m/s
• 3 10 m/s
• 4 30 m/s

A current of 2 A flows through a 5 Ω resistor. The potential difference is:

• 1 10 V
• 2 2.5 V
• 3 0.4 V
• 4 7 V

The kinetic energy of a 4 kg body moving at 5 m/s is:

• 1 20 J
• 2 50 J
• 3 100 J
• 4 10 J

The time period of an alternating current of frequency 50 Hz is:

• 1 0.5 s
• 2 0.02 s
• 3 50 s
• 4 0.2 s

Which of these is a vector quantity?

• 1 Velocity
• 2 Time
• 3 Mass
• 4 Speed

Heat can travel through a vacuum by:

• 1 Evaporation
• 2 Convection
• 3 Conduction
• 4 Radiation

A force of 10 N moves a body 5 m in its own direction. The work done is:

• 1 15 J
• 2 2 J
• 3 0.5 J
• 4 50 J

Two resistors of 4 Ω and 6 Ω are joined in parallel. The equivalent resistance is:

• 1 1.5 Ω
• 2 2.4 Ω
• 3 5 Ω
• 4 10 Ω

The SI unit of pressure is the:

• 1 Newton
• 2 Joule
• 3 Watt
• 4 Pascal

The momentum of a 2 kg body moving at 4 m/s is:

• 1 6 kg m/s
• 2 8 kg m/s
• 3 16 kg m/s
• 4 2 kg m/s

A projectile launched at the same speed has the greatest range when the angle of launch is:

• 1 30°
• 2 60°
• 3 90°
• 4 45°

A sound wave of frequency 500 Hz travels at 340 m/s. Its wavelength is:

• 1 170 m
• 2 1.47 m
• 3 0.68 m
• 4 0.5 m

An object is placed at twice the focal length of a convex lens. The image is:

• 1 Real and magnified
• 2 Real, inverted and the same size
• 3 Real and diminished
• 4 Virtual and upright

The heat needed to raise 2 kg of water by 5°C (c = 4200 J/kg°C) is:

• 1 4200 J
• 2 21000 J
• 3 8400 J
• 4 42000 J

The SI unit of magnetic flux is the:

• 1 Henry
• 2 Tesla
• 3 Gauss
• 4 Weber

A 12 V battery is connected across a 4 Ω resistor. The current is:

• 1 0.33 A
• 2 8 A
• 3 3 A
• 4 48 A

A 60 W bulb is used for 5 hours. The energy used is:

• 1 3 kWh
• 2 12 kWh
• 3 0.3 kWh
• 4 0.03 kWh

A body moves in a circle of radius 5 m at 10 m/s. Its centripetal acceleration is:

• 1 5 m/s²
• 2 2 m/s²
• 3 50 m/s²
• 4 20 m/s²

The gravitational potential energy of a 3 kg body at 10 m (g = 10 m/s²) is:

• 1 13 J
• 2 3000 J
• 3 30 J
• 4 300 J

When a source of sound moves toward a listener, the listener hears:

• 1 The same frequency
• 2 A lower frequency
• 3 A higher frequency
• 4 No sound

Total internal reflection can occur when light travels from:

• 1 Air to glass
• 2 A denser medium to a rarer medium
• 3 A rarer medium to a denser medium
• 4 Air to water

An alpha particle consists of:

• 1 1 proton and 2 neutrons
• 2 1 proton and 1 neutron
• 3 2 electrons
• 4 2 protons and 2 neutrons

The energy stored in a 2 μF capacitor charged to 100 V is:

• 1 0.02 J
• 2 0.01 J
• 3 1 J
• 4 0.2 J

Resistors of 3 Ω, 4 Ω and 5 Ω in series have a total resistance of:

• 1 5 Ω
• 2 60 Ω
• 3 1.28 Ω
• 4 12 Ω

In simple harmonic motion, the acceleration is:

• 1 Constant
• 2 Proportional to the speed
• 3 Proportional to the displacement and opposite to it
• 4 Zero at the ends

The first law of thermodynamics is written as:

• 1 ΔU = Q − W
• 2 Q = ΔU × W
• 3 ΔU = QW
• 4 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:

• 1 5 N m
• 2 10.5 N m
• 3 0.05 N m
• 4 20 N m

The speed of light in vacuum is about:

• 1 3 × 10¹⁰ m/s
• 2 3 × 10⁸ m/s
• 3 3 × 10⁶ m/s
• 4 340 m/s