Physics - Study Mode

[#1116] Bandwidth is the
Correct Answer

(C) Both a & b

Explanation

Solution: Bandwidth is measured as the amount of data that can be transferred from one point to another within a network in a specific amount of time. Typically, bandwidth is expressed as a bitrate and measured in bits per second (bps).

[#1117] Negative feedback in amplifiers
Correct Answer

(A) Increases bandwidth and decreases noise

Explanation

Solution: Negative feedback in amplifiers increases bandwidth and decreases noise.

[#1118] Rate of change of displacement is known as ________
Correct Answer

(B) Velocity

Explanation

Solution: The rate of change of displacement of an object (displacement over elapsed time) is velocity. Velocity is a vector since it has both magnitude (called speed) and direction.

[#1119] When a ball is thrown vertically upwards, which of the following quantities remains constant during its motion?
Correct Answer

(A) Energy

Explanation

Solution: When a ball is thrown vertically upwards, several physical quantities change during its motion. However, one quantity that remains constant during its motion is energy . As the ball rises, its kinetic energy decreases while its potential energy increases. When it reaches its highest point and starts to fall back down, the potential energy decreases, and the kinetic energy increases. The total mechanical energy (the sum of kinetic and potential energy) remains constant as long as no external forces (like air resistance) are acting on the ball. The other options are not constant during the motion: Option B: Displacement changes continuously as the ball moves up and then comes back down. Option C: Velocity changes as the ball moves upward (velocity decreases) and then downward (velocity increases). Option D: Acceleration is also not constant. It changes due to the gravitational force, causing deceleration as the ball rises and acceleration as it falls. So, the correct answer is Option A: Energy , which remains constant during the motion of a ball thrown vertically upwards, provided there are no external forces affecting it.

[#1120] For a body moving with non-uniform velocity and uniform acceleration
Correct Answer

(B) Displacement – Time graph is non-linear

Explanation

Solution: For a body moving with non-uniform velocity and uniform acceleration, Displacement – Time graph is non-linear.