Subject physics

The SI unit of energy is the:

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

A force acts on a 5 kg body and gives it an acceleration of 2 m/s². The force is:

• 1 10 N
• 2 3 N
• 3 2.5 N
• 4 7 N

A body with an initial speed of 5 m/s accelerates at 2 m/s² for 3 s. Its final speed is:

• 1 11 m/s
• 2 6 m/s
• 3 15 m/s
• 4 30 m/s

A current of 2 A flows in a 6 Ω resistor. The potential difference is:

• 1 12 V
• 2 3 V
• 3 0.33 V
• 4 8 V

The kinetic energy of a 2 kg body at 3 m/s is:

• 1 18 J
• 2 3 J
• 3 9 J
• 4 6 J

A force of 20 N moves a body 3 m in its own direction. The work done is:

• 1 17 J
• 2 60 J
• 3 6.7 J
• 4 23 J

A wave has a time period of 0.5 s. Its frequency is:

• 1 1 Hz
• 2 5 Hz
• 3 0.5 Hz
• 4 2 Hz

Which of these is a scalar quantity?

• 1 Velocity
• 2 Force
• 3 Displacement
• 4 Speed

Resistors of 6 Ω and 3 Ω are connected in parallel. The equivalent resistance is:

• 1 2 Ω
• 2 18 Ω
• 3 4.5 Ω
• 4 9 Ω

A convex lens is also called a:

• 1 Plane lens
• 2 Diverging lens
• 3 Concave lens
• 4 Converging lens

When light passes from air into glass, it bends:

• 1 Away from the normal
• 2 Back into the air
• 3 Toward the normal
• 4 Not at all

The weight of a 5 kg body on Earth (g = 10 m/s²) is:

• 1 50 N
• 2 0.5 N
• 3 15 N
• 4 5 N

The SI unit of power is the:

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

A body starts from rest and accelerates at 2 m/s² over 9 m. Its final speed is:

• 1 9 m/s
• 2 6 m/s
• 3 18 m/s
• 4 3 m/s

A machine does 600 J of work in 10 s. Its power is:

• 1 6000 W
• 2 6 W
• 3 610 W
• 4 60 W

A potential difference of 12 V drives a current of 3 A through a resistor. The resistance is:

• 1 4 Ω
• 2 9 Ω
• 3 36 Ω
• 4 0.25 Ω

A wave has a frequency of 5 Hz. Its time period is:

• 1 0.5 s
• 2 2 s
• 3 0.2 s
• 4 5 s

A force of 100 N acts on an area of 0.5 m². The pressure is:

• 1 50 Pa
• 2 100 Pa
• 3 200 Pa
• 4 20 Pa

Which of these cannot travel through a vacuum?

• 1 Light
• 2 Radio waves
• 3 X-rays
• 4 Sound

The two forces in an action and reaction pair of Newton's third law act on:

• 1 A third body
• 2 Different bodies
• 3 The same body
• 4 The ground only

A liquid has a density of 800 kg/m³. The mass of 0.5 m³ of it is:

• 1 400 kg
• 2 1.6 kg
• 3 800 kg
• 4 1600 kg

A charge of 6 C passes a point in 2 s. The current is:

• 1 8 A
• 2 12 A
• 3 0.33 A
• 4 3 A

A concave mirror is also called a:

• 1 Diverging mirror
• 2 Convex mirror
• 3 Converging mirror
• 4 Plane mirror

After two half-lives, the fraction of a radioactive sample that is left is:

• 1 1/4
• 2 1/8
• 3 1/2
• 4 0