Physics Syllabus (JEE Main)

Current Electricity Electrostatics Gravitation Kinematics Kinetic Theory of Gases Laws of Motion Magnetism & EMI Modern Physics Optics Oscillations & Waves Properties of Matter Rotational Motion Thermodynamics Units & Measurement Work, Energy & Power

Q. If a 3 kg object is moving with a speed of 4 m/s and comes to a stop, what is the work done by friction?

A. -24 J
B. -48 J
C. 0 J
D. 24 J

Solution

Initial kinetic energy = 0.5 × m × v² = 0.5 × 3 kg × (4 m/s)² = 24 J. Work done by friction = -24 J.

Correct Answer: B — -48 J

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Q. If a 3 kg object is moving with a speed of 4 m/s and comes to a stop, what is the work done by the friction?

A. -24 J
B. -48 J
C. -12 J
D. -36 J

Solution

Initial kinetic energy = 0.5 × 3 kg × (4 m/s)² = 24 J. Work done by friction = -24 J.

Correct Answer: B — -48 J

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Q. If a 3 kg object is moving with a speed of 4 m/s and comes to a stop, what is the work done by the friction force?

A. -24 J
B. -48 J
C. -72 J
D. -96 J

Solution

Initial kinetic energy = 0.5 × 3 kg × (4 m/s)² = 24 J. Work done by friction = -24 J.

Correct Answer: B — -48 J

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Q. If a 3 kg object is moving with a speed of 4 m/s, what is the total mechanical energy if it is at a height of 2 m?

A. 30 J
B. 40 J
C. 50 J
D. 60 J

Solution

Total mechanical energy = K.E + P.E = 0.5 × 3 kg × (4 m/s)² + 3 kg × 9.8 m/s² × 2 m = 24 J + 58.8 J = 82.8 J.

Correct Answer: C — 50 J

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Q. If a 3 kg object is moving with a velocity of 4 m/s, what is its momentum?

A. 12 kg m/s
B. 6 kg m/s
C. 8 kg m/s
D. 10 kg m/s

Solution

Momentum (p) = m * v = 3 kg * 4 m/s = 12 kg m/s

Correct Answer: A — 12 kg m/s

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Q. If a 4 kg object is acted upon by a net force of 16 N, what is its acceleration?

A. 2 m/s²
B. 3 m/s²
C. 4 m/s²
D. 5 m/s²

Solution

Using F = ma, we have a = F/m = 16 N / 4 kg = 4 m/s².

Correct Answer: C — 4 m/s²

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Q. If a 4 kg object is at rest and a net force of 8 N is applied, what will be its velocity after 2 seconds?

A. 4 m/s
B. 2 m/s
C. 1 m/s
D. 0 m/s

Solution

Using F = ma, a = F/m = 8 N / 4 kg = 2 m/s². Velocity after 2 seconds = a * t = 2 m/s² * 2 s = 4 m/s.

Correct Answer: B — 2 m/s

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Q. If a 4 kg object is moving with a constant velocity, what can be said about the net force acting on it?

A. It is zero
B. It is equal to its weight
C. It is equal to the applied force
D. It is maximum

Solution

According to Newton's first law, if an object is moving with constant velocity, the net force acting on it is zero.

Correct Answer: A — It is zero

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Q. If a 5 kg object is in free fall, what is the force acting on it due to gravity?

A. 5 N
B. 10 N
C. 50 N
D. 15 N

Solution

The force due to gravity F = mg = 5 kg * 10 m/s² = 50 N.

Correct Answer: C — 50 N

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Q. If a 5 kg object is lifted to a height of 10 m, what is the potential energy gained by the object? (g = 9.8 m/s²)

A. 490 J
B. 980 J
C. 245 J
D. 2450 J

Solution

Potential Energy = mass × g × height = 5 kg × 9.8 m/s² × 10 m = 490 J.

Correct Answer: B — 980 J

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Q. If a 5 kg object is lifted to a height of 10 m, what is the work done against gravity?

A. 50 J
B. 100 J
C. 150 J
D. 200 J

Solution

Work done = mgh = 5 kg × 9.8 m/s² × 10 m = 490 J.

Correct Answer: D — 200 J

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Q. If a 5 kg object is lifted to a height of 10 m, what is the work done against gravity? (g = 9.8 m/s²)

A. 49 J
B. 98 J
C. 490 J
D. 980 J

Solution

Work done = mgh = 5 kg × 9.8 m/s² × 10 m = 490 J.

Correct Answer: C — 490 J

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Q. If a 5 kg object is subjected to a force of 20 N, what is its acceleration?

A. 2 m/s²
B. 4 m/s²
C. 5 m/s²
D. 10 m/s²

Solution

Using F = ma, acceleration a = F/m = 20 N / 5 kg = 4 m/s².

Correct Answer: B — 4 m/s²

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Q. If a 5 ohm resistor and a 10 ohm resistor are connected in series, what is the voltage across the 10 ohm resistor when a current of 2 A flows through the circuit?

A. 10 V
B. 20 V
C. 5 V
D. 15 V

Solution

Voltage across the 10 ohm resistor, V = I * R = 2 A * 10 Ω = 20 V.

Correct Answer: B — 20 V

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Q. If a 5 ohm resistor is connected to a 10V battery, what is the energy consumed in 2 seconds?

A. 10 J
B. 20 J
C. 5 J
D. 15 J

Solution

Power P = V^2 / R = 10^2 / 5 = 20 W. Energy = Power * time = 20 W * 2 s = 40 J.

Correct Answer: B — 20 J

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Q. If a 5 ohm resistor is connected to a 10V battery, what is the energy consumed in 2 minutes?

A. 60 J
B. 120 J
C. 240 J
D. 30 J

Solution

Power P = V^2/R = 10^2 / 5 = 20 W. Energy = Power * time = 20 W * 120 s = 2400 J.

Correct Answer: B — 120 J

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Q. If a 5Ω resistor is connected in parallel with a 10Ω resistor, what is the equivalent resistance?

A. 3.33Ω
B. 5Ω
C. 7.5Ω
D. 15Ω

Solution

R_eq = 1/(1/5 + 1/10) = 3.33Ω.

Correct Answer: A — 3.33Ω

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Q. If a 6 kg object is subjected to a net force of 24 N, what is its acceleration?

A. 4 m/s²
B. 6 m/s²
C. 8 m/s²
D. 10 m/s²

Solution

Using F = ma, acceleration a = F/m = 24 N / 6 kg = 4 m/s².

Correct Answer: A — 4 m/s²

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Q. If a 60W bulb operates at 120V, what is the resistance of the bulb?

A. 240 ohms
B. 120 ohms
C. 60 ohms
D. 30 ohms

Solution

Using P = V^2 / R, R = V^2 / P = (120V)^2 / 60W = 240 ohms.

Correct Answer: B — 120 ohms

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Q. If a 60W light bulb operates at 120V, what is the resistance of the bulb?

A. 240 ohms
B. 120 ohms
C. 60 ohms
D. 30 ohms

Solution

Power (P) = V^2 / R, so R = V^2 / P = (120V)^2 / 60W = 240 ohms.

Correct Answer: B — 120 ohms

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Q. If a 6V battery is connected to a circuit with a total resistance of 3 ohms, what is the current flowing through the circuit?

A. 1A
B. 2A
C. 3A
D. 4A

Solution

Using Ohm's law, I = V/R = 6V / 3 ohms = 2A.

Correct Answer: B — 2A

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Q. If a 6Ω resistor is connected to a 9V battery, what is the power dissipated by the resistor?

A. 6W
B. 9W
C. 12W
D. 15W

Solution

Power P = V^2 / R = (9V)^2 / 6Ω = 81 / 6 = 13.5W.

Correct Answer: C — 12W

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Q. If a 9V battery is connected to a 3Ω resistor, what is the power consumed by the resistor?

A. 3W
B. 9W
C. 27W
D. 1W

Solution

Power P = V^2/R = (9V)^2 / 3Ω = 81/3 = 27W.

Correct Answer: B — 9W

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Q. If A = 0 and B = 0, what is the output of A AND B?

A. 0
B. 1
C. 2
D. Undefined

Solution

The AND gate outputs 1 only when both inputs are 1. Since both A and B are 0, the output is 0.

Correct Answer: A — 0

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Q. If A = 0 and B = 1, what is the output of A AND B?

A. 0
B. 1
C. Undefined
D. Both 0 and 1

Solution

The output of A AND B is 0 when A is 0.

Correct Answer: A — 0

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Q. If A = 0 and B = 1, what is the output of the OR gate?

A. 0
B. 1
C. 2
D. Undefined

Solution

An OR gate outputs 1 if at least one input is high. Since B is 1, the output is 1.

Correct Answer: B — 1

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Q. If A = 0 and B = 1, what is the output of the XOR gate?

A. 0
B. 1
C. 2
D. Undefined

Solution

The XOR gate outputs 1 when the inputs are different. Since A is 0 and B is 1, the output is 1.

Correct Answer: B — 1

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Q. If A = 1 and B = 1, what is the output of the AND gate?

A. 0
B. 1
C. 2
D. Undefined

Solution

The AND gate outputs 1 only when both inputs are high. Since A = 1 and B = 1, the output is 1.

Correct Answer: B — 1

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Q. If A = 1 and B = 1, what is the output of the XOR gate?

A. 0
B. 1
C. 2
D. Undefined

Solution

An XOR gate outputs 1 only when the inputs are different. Since both inputs are 1, the output is 0.

Correct Answer: A — 0

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Q. If A = 1, B = 1, and C = 0, what is the output of A OR (B AND C)?

A. 0
B. 1
C. 2
D. Undefined

Solution

B AND C = 1 AND 0 = 0. Then, A OR 0 = 1 OR 0 = 1.

Correct Answer: B — 1

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Physics Syllabus (JEE Main)

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