Q. If a car does 3000 J of work in moving a distance of 150 m, what is the average force exerted by the car? (2023)
A.
20 N
B.
30 N
C.
40 N
D.
50 N
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Solution
Average Force = Work / Distance = 3000 J / 150 m = 20 N
Correct Answer:
B
— 30 N
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Q. If a car does 600 J of work in moving a distance of 30 m, what is the average force exerted by the car? (2023)
A.
20 N
B.
15 N
C.
25 N
D.
10 N
Show solution
Solution
Average Force (F) = Work (W) / Distance (d) = 600 J / 30 m = 20 N.
Correct Answer:
A
— 20 N
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Q. If a car does 6000 J of work in moving a distance of 100 m, what is the average force exerted by the car? (2023)
A.
60 N
B.
50 N
C.
70 N
D.
80 N
Show solution
Solution
Average Force = Work / Distance = 6000 J / 100 m = 60 N
Correct Answer:
A
— 60 N
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Q. If a circuit has a resistance of 5 ohms and a current of 2 amperes, what is the voltage across the circuit?
A.
10 V
B.
5 V
C.
2 V
D.
1 V
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Solution
Using Ohm's Law (V = I * R), V = 2 A * 5 Ω = 10 V.
Correct Answer:
A
— 10 V
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Q. If a concave lens has a power of -5 D, what is its focal length? (2021)
A.
-20 cm
B.
-25 cm
C.
-15 cm
D.
-10 cm
Show solution
Solution
Power P = 1/f, thus f = 1/P = 1/(-5) = -0.2 m = -20 cm.
Correct Answer:
B
— -25 cm
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Q. If a cyclist travels at a speed of 15 km/h for 1 hour and then at 20 km/h for 2 hours, what is the average speed for the entire journey? (2022)
A.
17 km/h
B.
18 km/h
C.
19 km/h
D.
20 km/h
Show solution
Solution
Total distance = 15 km + 40 km = 55 km; Total time = 1 h + 2 h = 3 h; Average speed = Total distance / Total time = 55 km / 3 h = 18.33 km/h.
Correct Answer:
B
— 18 km/h
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Q. If a force of 10 N is applied to an object and it moves 3 m in the direction of the force, what is the work done? (2021)
A.
30 J
B.
20 J
C.
10 J
D.
15 J
Show solution
Solution
Work done W = F * d = 10 N * 3 m = 30 J.
Correct Answer:
A
— 30 J
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Q. If a force of 15 N is applied at an angle of 60° to the horizontal and moves an object 4 m, what is the work done? (2021)
A.
30 J
B.
60 J
C.
45 J
D.
20 J
Show solution
Solution
Work done (W) = F × d × cos(θ) = 15 N × 4 m × cos(60°) = 15 N × 4 m × 0.5 = 30 J.
Correct Answer:
C
— 45 J
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Q. If a force of 50 N is applied to move an object 4 m in the direction of the force, what is the work done?
A.
100 J
B.
200 J
C.
150 J
D.
250 J
Show solution
Solution
Work done W = F × d = 50 N × 4 m = 200 J.
Correct Answer:
B
— 200 J
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Q. If a machine has an efficiency of 80% and it does 400 J of useful work, how much energy was supplied to the machine? (2023)
A.
500 J
B.
400 J
C.
320 J
D.
600 J
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Solution
Efficiency = Useful Work / Total Energy Input. Total Energy Input = Useful Work / Efficiency = 400 J / 0.8 = 500 J.
Correct Answer:
A
— 500 J
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Q. If a sound source moves towards a stationary observer, what happens to the frequency heard by the observer?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
As the sound source approaches, the frequency increases due to the Doppler effect.
Correct Answer:
A
— Increases
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Q. If a sound source moves towards an observer, what effect does it have on the frequency heard by the observer?
A.
Decreases
B.
Increases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
The frequency increases due to the Doppler effect when the source moves towards the observer.
Correct Answer:
B
— Increases
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Q. If a sound source moves towards an observer, what happens to the frequency heard by the observer?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
The frequency increases due to the Doppler effect when the source moves towards the observer.
Correct Answer:
A
— Increases
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Q. If a sound wave travels 1 km in 3 seconds, what is its speed?
A.
300 m/s
B.
1000 m/s
C.
333 m/s
D.
500 m/s
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Solution
Speed = Distance/Time = 1000 m / 3 s = 333.33 m/s, approximately 333 m/s.
Correct Answer:
A
— 300 m/s
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Q. If a sound wave travels from air into water, what happens to its speed?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Sound travels faster in water than in air due to higher density.
Correct Answer:
A
— Increases
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Q. If a vehicle travels 100 km in 2 hours and then 50 km in 1 hour, what is its average speed for the entire trip? (2019)
A.
50 km/h
B.
60 km/h
C.
70 km/h
D.
75 km/h
Show solution
Solution
Total distance = 100 km + 50 km = 150 km; Total time = 2 h + 1 h = 3 h. Average speed = Total distance / Total time = 150 km / 3 h = 50 km/h.
Correct Answer:
C
— 70 km/h
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Q. If a wire carries a current of 3 A and has a resistance of 2 ohms, what is the power dissipated in the wire?
A.
6 W
B.
9 W
C.
12 W
D.
15 W
Show solution
Solution
Power is given by P = I^2 * R. Here, P = (3 A)^2 * 2 Ω = 9 * 2 = 18 W.
Correct Answer:
C
— 12 W
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Q. If a wire carries a current of 4 A and has a resistance of 2 ohms, what is the power dissipated in the wire?
A.
8 W
B.
16 W
C.
4 W
D.
2 W
Show solution
Solution
Power (P) is given by P = I^2 * R. Thus, P = (4 A)^2 * 2 Ω = 16 W.
Correct Answer:
B
— 16 W
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Q. If the boiling point of water is 100°C, what is the corresponding temperature in Kelvin? (2021)
A.
273 K
B.
373 K
C.
400 K
D.
450 K
Show solution
Solution
Temperature in Kelvin (K) = °C + 273 = 100 + 273 = 373 K.
Correct Answer:
B
— 373 K
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Q. If the focal length of a convex lens is 25 cm, what is the power of the lens? (2023)
A.
+2 D
B.
+4 D
C.
+5 D
D.
+10 D
Show solution
Solution
Power P = 1/f (in meters). Thus, P = 1/0.25 = +4 D.
Correct Answer:
C
— +5 D
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Q. If the frequency of an AC circuit is doubled, what happens to the inductive reactance?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
Inductive reactance (X_L) is given by X_L = 2πfL. If the frequency (f) is doubled, the inductive reactance also doubles.
Correct Answer:
A
— It doubles
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Q. If the frequency of an AC signal is doubled, what happens to its period?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
The period T is the reciprocal of frequency f (T = 1/f). If frequency is doubled, the period halves.
Correct Answer:
B
— It halves
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Q. If the mass of an object is 2 kg, what is its energy equivalent according to Einstein's equation E=mc^2? (2022)
A.
1.8 x 10^16 J
B.
1.8 x 10^14 J
C.
1.8 x 10^12 J
D.
1.8 x 10^10 J
Show solution
Solution
E = mc^2 = 2 kg * (3 x 10^8 m/s)^2 = 1.8 x 10^16 J.
Correct Answer:
A
— 1.8 x 10^16 J
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Q. If the resistance of a conductor is doubled, what happens to the current if the voltage remains constant? (2020)
A.
Doubles
B.
Halves
C.
Remains the same
D.
Increases four times
Show solution
Solution
According to Ohm's Law, if the resistance is doubled while the voltage remains constant, the current will be halved.
Correct Answer:
B
— Halves
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Q. If the resistance of a wire is 10 ohms and the voltage across it is 20 volts, what is the current flowing through the wire?
A.
2 A
B.
5 A
C.
10 A
D.
20 A
Show solution
Solution
Using Ohm's Law (I = V/R), I = 20 V / 10 Ω = 2 A.
Correct Answer:
A
— 2 A
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Q. If the resistance of a wire is doubled, what happens to the current if the voltage remains constant? (2021)
A.
Doubles
B.
Halves
C.
Remains the same
D.
Increases
Show solution
Solution
According to Ohm's Law (I = V/R), if the resistance (R) is doubled while the voltage (V) remains constant, the current (I) will be halved.
Correct Answer:
B
— Halves
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Q. If the speed of sound in air is 340 m/s, how long does it take for sound to travel 1 km?
A.
2.94 s
B.
3.5 s
C.
4.5 s
D.
5.5 s
Show solution
Solution
Time = distance/speed = 1000 m / 340 m/s ≈ 2.94 s.
Correct Answer:
A
— 2.94 s
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Q. If the velocity of an object doubles, what happens to its kinetic energy?
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
Show solution
Solution
Kinetic energy (KE) is given by KE = 1/2 mv². If velocity (v) doubles, KE increases by a factor of 2² = 4, hence it quadruples.
Correct Answer:
C
— It quadruples
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Q. If the voltage across a resistor is doubled, what happens to the power consumed by the resistor? (2020)
A.
It halves
B.
It doubles
C.
It quadruples
D.
It remains the same
Show solution
Solution
Power (P) is given by P = V^2 / R. If V is doubled, P becomes (2V)^2 / R = 4V^2 / R, which is quadrupled.
Correct Answer:
C
— It quadruples
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Q. If the wavelength of a light wave is doubled, what happens to its frequency? (2020)
A.
Doubles
B.
Halves
C.
Remains the same
D.
Quadruples
Show solution
Solution
Frequency (f) is inversely proportional to wavelength (λ). If λ is doubled, f is halved.
Correct Answer:
B
— Halves
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Showing 121 to 150 of 232 (8 Pages)
Physics MCQ & Objective Questions
Physics is a crucial subject for students preparing for school exams and competitive tests in India. Mastering Physics not only helps in understanding the fundamental principles of the universe but also plays a significant role in scoring well in exams. Practicing MCQs and objective questions is an effective way to enhance your exam preparation, as it allows you to identify important questions and solidify your grasp on key concepts.
What You Will Practise Here
Key concepts of Mechanics, including Newton's Laws of Motion
Fundamentals of Thermodynamics and its applications
Electromagnetism, covering electric fields and circuits
Waves and Sound, including properties and types of waves
Optics, focusing on reflection, refraction, and lenses
Modern Physics concepts like Quantum Mechanics and Relativity
Important formulas and definitions essential for problem-solving
Exam Relevance
Physics is a significant part of the curriculum for CBSE, State Boards, NEET, and JEE exams. Students can expect questions that test their understanding of concepts through multiple-choice formats. Common patterns include numerical problems, conceptual questions, and application-based scenarios that require a solid understanding of the subject. Familiarity with Physics MCQ questions will greatly enhance your performance in these examinations.
Common Mistakes Students Make
Misunderstanding the application of formulas in different contexts
Confusing units of measurement, especially in numerical problems
Overlooking the significance of diagrams in understanding concepts
Neglecting to review fundamental principles before attempting complex problems
FAQs
Question: How can I improve my Physics problem-solving skills?Answer: Regular practice of MCQs and reviewing key concepts will help improve your problem-solving skills in Physics.
Question: Are there specific topics I should focus on for competitive exams?Answer: Yes, focus on Mechanics, Thermodynamics, and Electromagnetism, as these areas frequently appear in competitive exams.
Start solving practice MCQs today to test your understanding and boost your confidence in Physics. Remember, consistent practice is key to mastering this subject and achieving your exam goals!
