CGL 2024 Prelims Physics
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| Exam | CGL (Prelims) |
| Year | 2024 |
| Subject | Physics |
| Questions | 18 |
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Question 1 of 18
1. Question
What is the SI unit of current?
Correct
➤ Electric current is the rate of flow of charge, and its SI unit is Ampere (A), named after André-Marie Ampère.
★ Ampere is one of the seven fundamental SI units.Incorrect
➤ Electric current is the rate of flow of charge, and its SI unit is Ampere (A), named after André-Marie Ampère.
★ Ampere is one of the seven fundamental SI units. -
Question 2 of 18
2. Question
What is the unit of measurement for optical power of the lens?
Correct
➤ The optical power of a lens is measured in Diopters (D), defined as the reciprocal of its focal length in meters.
★ Diopters are widely used in eye prescriptions and optical instruments.Incorrect
➤ The optical power of a lens is measured in Diopters (D), defined as the reciprocal of its focal length in meters.
★ Diopters are widely used in eye prescriptions and optical instruments. -
Question 3 of 18
3. Question
What is the unit of specific resistance?
Correct
➤ Specific resistance or resistivity is measured in Ohm meter (Ω·m), representing the resistance of a unit cube of a material.
★ Resistivity is a material property independent of shape or size.Incorrect
➤ Specific resistance or resistivity is measured in Ohm meter (Ω·m), representing the resistance of a unit cube of a material.
★ Resistivity is a material property independent of shape or size. -
Question 4 of 18
4. Question
Which famous experiment was done by Michael Faraday in 1831?
Correct
➤ In 1831, Michael Faraday demonstrated electromagnetic induction, where a changing magnetic field induces current in a conductor.
★ This principle is the foundation of electric generators and transformers.Incorrect
➤ In 1831, Michael Faraday demonstrated electromagnetic induction, where a changing magnetic field induces current in a conductor.
★ This principle is the foundation of electric generators and transformers. -
Question 5 of 18
5. Question
Which of the following is NOT a unit of energy?
Correct
➤ Newton is a unit of force, not energy.
➤ Joule, Calorie, and Kilowatt-hour are valid energy units.
★ 1 Newton = 1 kg·m/s², while 1 Joule = 1 N·m.Incorrect
➤ Newton is a unit of force, not energy.
➤ Joule, Calorie, and Kilowatt-hour are valid energy units.
★ 1 Newton = 1 kg·m/s², while 1 Joule = 1 N·m. -
Question 6 of 18
6. Question
Which of the following statements is NOT correct?
Correct
➤ A light year is a unit of distance, not time. It is the distance light travels in one year.
★ 1 light year ≈ 9.46 × 10¹² kilometers.Incorrect
➤ A light year is a unit of distance, not time. It is the distance light travels in one year.
★ 1 light year ≈ 9.46 × 10¹² kilometers. -
Question 7 of 18
7. Question
What was the name of the wind measuring instrument invented for the first time in 1450?
Correct
➤ The anemometer, invented by Leon Battista Alberti in 1450, is used to measure wind speed.
★ It plays a key role in weather forecasting and aviation.Incorrect
➤ The anemometer, invented by Leon Battista Alberti in 1450, is used to measure wind speed.
★ It plays a key role in weather forecasting and aviation. -
Question 8 of 18
8. Question
Identify the INCORRECT pair regarding motion and their examples?
Correct
➤ Earth’s motion around the Sun is periodic circular motion, not oscillatory. ➤ Oscillatory motion is back-and-forth about a fixed point.
★ Examples of oscillatory motion include a pendulum and tuning fork.Incorrect
➤ Earth’s motion around the Sun is periodic circular motion, not oscillatory. ➤ Oscillatory motion is back-and-forth about a fixed point.
★ Examples of oscillatory motion include a pendulum and tuning fork. -
Question 9 of 18
9. Question
Which of the following two quantities have the same dimensions?
Correct
➤ Work and torque both have the same dimensions: [ML²T⁻²], though they represent different physical concepts.
★ Work is scalar, torque is a vector quantity.Incorrect
➤ Work and torque both have the same dimensions: [ML²T⁻²], though they represent different physical concepts.
★ Work is scalar, torque is a vector quantity. -
Question 10 of 18
10. Question
What happens when two forces act in the opposite directions on an object?
Correct
➤ When forces act in opposite directions, the net force is the difference between them in the direction of the larger force.
★ If both forces are equal and opposite, the object experiences zero net force (equilibrium).Incorrect
➤ When forces act in opposite directions, the net force is the difference between them in the direction of the larger force.
★ If both forces are equal and opposite, the object experiences zero net force (equilibrium). -
Question 11 of 18
11. Question
Name the phenomenon where an opaque object on the path of light becomes very small and where light has a tendency to bend around it and not walk in a straight line.
Correct
➤ Diffraction is the bending of light around the edges of an obstacle or aperture, causing the shadow of an opaque object to appear smaller or blurred.
★ This phenomenon proves that light behaves as a wave under certain conditions.Incorrect
➤ Diffraction is the bending of light around the edges of an obstacle or aperture, causing the shadow of an opaque object to appear smaller or blurred.
★ This phenomenon proves that light behaves as a wave under certain conditions. -
Question 12 of 18
12. Question
If a bar magnet is hung from a string, in which direction does its north pole point?
Correct
➤ A freely suspended bar magnet aligns itself in the North-South direction, with the north pole pointing towards the Earth’s magnetic north.
★ This property forms the basis of magnetic compasses used for navigation.Incorrect
➤ A freely suspended bar magnet aligns itself in the North-South direction, with the north pole pointing towards the Earth’s magnetic north.
★ This property forms the basis of magnetic compasses used for navigation. -
Question 13 of 18
13. Question
A small object is placed on the focus on the left side of a convex lens. Where will be the image formed?
Correct
➤ When an object is placed at the focus of a convex lens, the refracted rays become parallel, and the image forms at infinity on the opposite side.
★ The image is real, inverted, and highly enlarged.Incorrect
➤ When an object is placed at the focus of a convex lens, the refracted rays become parallel, and the image forms at infinity on the opposite side.
★ The image is real, inverted, and highly enlarged. -
Question 14 of 18
14. Question
In the Right-Hand Thumb Rule, the thumb is directed towards the direction of:
Correct
➤ In the Right-Hand Thumb Rule, the thumb points in the direction of current, and the curled fingers indicate the direction of magnetic field lines.
★ It is used to determine the direction of magnetic field around a current-carrying conductor.Incorrect
➤ In the Right-Hand Thumb Rule, the thumb points in the direction of current, and the curled fingers indicate the direction of magnetic field lines.
★ It is used to determine the direction of magnetic field around a current-carrying conductor. -
Question 15 of 18
15. Question
In the context of vernier calliper, an internal jaw is used to measure:
Correct
➤ The internal jaws of a vernier calliper are used to measure the internal diameters of hollow objects like cylinders or pipes.
★ External jaws measure outer dimensions; depth rod measures depth.Incorrect
➤ The internal jaws of a vernier calliper are used to measure the internal diameters of hollow objects like cylinders or pipes.
★ External jaws measure outer dimensions; depth rod measures depth. -
Question 16 of 18
16. Question
Calorimeter is a small container made of a thin sheet of ____ with good thermal conductivity.
Correct
➤ A calorimeter is made of copper due to its high thermal conductivity and low specific heat, allowing it to quickly gain or lose heat.
★ Calorimeters are used to measure heat changes in physical and chemical processes.Incorrect
➤ A calorimeter is made of copper due to its high thermal conductivity and low specific heat, allowing it to quickly gain or lose heat.
★ Calorimeters are used to measure heat changes in physical and chemical processes. -
Question 17 of 18
17. Question
An electric iron requires a _____ fuse to prevent short circuiting.
Correct
➤ A typical electric iron operates at 1000–1200 watts, requiring a 5 A fuse for safety against short circuits or overcurrent.
★ A fuse melts when the current exceeds its rating, breaking the circuit.Incorrect
➤ A typical electric iron operates at 1000–1200 watts, requiring a 5 A fuse for safety against short circuits or overcurrent.
★ A fuse melts when the current exceeds its rating, breaking the circuit. -
Question 18 of 18
18. Question
How long will a sound wave take to travel 1.5km, which has a frequency of 5 kHz and wavelength of 6 cm?
Correct
➤ Speed of sound = frequency × wavelength = 5000 Hz × 0.06 m = 300 m/s
➤ Time = distance/speed = 1500 m / 300 m/s = 5 seconds.
★ This question tests understanding of wave speed formula: v = f × λ.Incorrect
➤ Speed of sound = frequency × wavelength = 5000 Hz × 0.06 m = 300 m/s
➤ Time = distance/speed = 1500 m / 300 m/s = 5 seconds.
★ This question tests understanding of wave speed formula: v = f × λ.