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Current Affairs January 2024

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4

Which type of lens is thicker in the center and thinner at the edges?

A. Convex lens

B. Concave lens

C. Plano-convex lens

D. Plano-concave lens

Correct Answer :

B. Concave lens


Related Questions

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4

What is the SI unit of electric field strength?

A. Volt per meter

B. Newton per coulomb

C. Coulomb per second

D. Ampere per meter

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4

What is the phenomenon where a wave combines with another wave to produce a wave with greater amplitude?

A. Reflection

B. Diffraction

C. Refraction

D. Constructive interference

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4

What is the phenomenon where light waves oscillate in a single plane?

A. Polarization

B. Diffraction

C. Interference

D. Dispersion

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4

Which law states that the pressure of a gas is directly proportional to its absolute temperature at constant volume?

A. Boyle's Law

B. Charles's Law

C. Gay-Lussac's Law

D. Avogadro's Law

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4

Which of the following statements about nuclear reactors is true?

A. They use nuclear fusion to generate electricity.

B. They control nuclear fission reactions to produce heat.

C. They primarily use coal as a fuel source.

D. They do not involve the release of radiation.

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4

What is the SI unit of magnetic flux density?

A. Tesla

B. Weber

C. Henry

D. Gauss

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4

Which of the following is a measure of an object's resistance to changes in its state of motion?

A. Inertia

B. Momentum

C. Impulse

D. Damping coefficient

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4

What is the SI unit of half-life in radioactive decay?

A. Second

B. Year

C. Joule

D. Becquerel

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4

What is the phenomenon where a wave undergoes a change in direction due to a change in medium?

A. Reflection

B. Diffraction

C. Refraction

D. Interference

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4

What is the phenomenon where a wave changes direction as it passes through a medium with a different density?

A. Reflection

B. Diffraction

C. Refraction

D. Interference

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4

Which of the following statements about waves is true?

A. Longitudinal waves require a medium for propagation.

B. Transverse waves have oscillations perpendicular to the direction of wave motion.

C. Electromagnetic waves are an example of mechanical waves.

D. Sound waves are an example of electromagnetic waves.

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4

Which of the following is a measure of an object's resistance to changes in its linear motion?

A. Inertia

B. Momentum

C. Impulse

D. Damping coefficient

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4

What is the process by which a solid changes directly into a gas without passing through the liquid phase?

A. Evaporation

B. Sublimation

C. Condensation

D. Melting

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4

Which of the following is an example of a longitudinal wave?

A. Sound wave

B. Light wave

C. X-ray

D. Radio wave

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4

Which law states that the volume of a gas is directly proportional to its absolute temperature at constant pressure?

A. Boyle's Law

B. Charles's Law

C. Gay-Lussac's Law

D. Avogadro's Law

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4

What is the law that states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration?

A. Newton's First Law of Motion

B. Newton's Second Law of Motion

C. Newton's Third Law of Motion

D. Law of Gravitation

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4

What is the SI unit of magnetic field strength in the CGS system?

A. Oersted

B. Tesla per meter

C. Ampere per meter

D. Weber

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4

What is the SI unit of inductance?

A. Henry

B. Farad

C. Ohm

D. Volt

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4

Which of the following is a non-contact force?

A. Friction

B. Tension

C. Gravity

D. Magnetic force

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4

What is the SI unit of power?

A. Watt

B. Joule

C. Volt

D. Ampere

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4

Which type of lens is thicker in the center and thinner at the edges?

A. Convex lens

B. Concave lens

C. Plano-convex lens

D. Plano-concave lens

What is the correct answer?

4

Which of the following statements about nuclear fusion is true?

A. It releases energy when light nuclei combine to form heavier nuclei.

B. It is the process that powers stars.

C. It is a type of radioactive decay.

D. It involves the emission of beta particles.

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4

Which type of mirror can form both real and virtual images?

A. Concave mirror

B. Convex mirror

C. Plane mirror

D. Spherical mirror

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4

What is the SI unit of electric charge in the CGS system?

A. Statcoulomb

B. Coulomb

C. Ampere-hour

D. Franklin

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4

Which law states that the force between two charges is inversely proportional to the square of the distance between them?

A. Coulomb's Law

B. Ohm's Law

C. Gauss's Law

D. Ampere's Law

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4

Which of the following is a fundamental particle found in the nucleus of an atom?

A. Neutron

B. Electron

C. Proton

D. Photon

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4

What is the formula for calculating electric power in a circuit?

A. P = VI

B. P = V²/R

C. P = I²R

D. P = V/R

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4

Which of the following statements about kinetic friction is true?

A. It always opposes motion.

B. It is independent of the normal force.

C. It is greater than static friction.

D. It depends on the velocity of the object.

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4

What is the SI unit of capacitance in the CGS system?

A. Farad

B. Statfarad

C. Ampere-second

D. Volt

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4

What is the process by which an unstable atomic nucleus loses energy by emitting radiation called?

A. Radioactive decay

B. Nuclear fission

C. Nuclear fusion

D. Electron capture