PHYSICS JEE MAIN QUIZ

A wheel rotates at 300 rpm. What is its angular velocity in rad/s?

• 10π
• 20π
• 30π
• 5π

A torque of 10 Nm is applied to a wheel of moment of inertia 2 kg·m². What is its angular acceleration?

• 5 rad/s²
• 20 rad/s²
• 10 rad/s²
• 2 rad/s²

A solid cylinder rolls down a ramp. What fraction of its total energy is rotational?

• 1/3

• 1/4

• 1/2

• 2/3

A 1 kg block tied to a string moves in a circular path with a radius of 2 m and speed of 5 m/s. Find the tension.

Find the heat required to raise the temperature of 2 kg of water from 30°C to 100°C. (Specific heat: 4200 J/kg·°C)

A gas undergoes an isothermal expansion from 1 L to 2 L at a pressure of 2 atm. Calculate the work done.

• 138 J
• 276 J
• 1380 J
• 2760 J

A Carnot engine has a hot reservoir at 500 K and a cold reservoir at 300 K. What is its efficiency?

• 0.4
• 0.6
• 0.33
• 0.5

Two resistors of 4 Ω and 6 Ω are connected in series. Find the equivalent resistance.

• 10 Ω
• 2.4 Ω
• 24 Ω
• 1.5 Ω

A wire of resistance 10 Ω is stretched to double its length. Find its new resistance.

• 20 Ω
• 40 Ω
• 10 Ω
• 30 Ω

A current of 3 A flows through a resistor of 5 Ω. Find the power dissipated.

• 45 W
• 30 W
• 75 W
• 15 W