Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
Solid friction, like viscosity is
independent of the surface area in contact
independent of the relative motion between layers
dependent on normal reaction
in opposition to motion
Correct answer is D
The force acting on a body due to the viscous resistance of the surrounding fluid is called the drag force and it acts in the direction opposite to the direction of motion. So also does friction.
Which of the following statements about pressure in a liquid is correct?
the pressure in a liquid increases with depth
the higher the density of a liquid, the lower the pressure it exerts
pressure in liquid act only in a direction perpendicular to the sides of the containing vessel
pressure is independent of the acceleration due to gravity
Correct answer is A
At different depths, the pressure of a liquid differs.
Which of the following units is equivalent to the watt?
kgms-2
kgm2s-3
kgm2s-2
kgm2s-1
Correct answer is B
\(Power = \frac{\text{Work done}}{time}\)
= \(\frac{Force \times distance}{time}\)
= \(\frac{mass \times acceleration \times distance}{time}\)
= \(\frac{kg \times m \times m}{s^{2} \times s}\)
= \(kgm^{2} s^{-3}\)
The rising of a liquid in an open and ended glass tube of narrow bore is
osmosis
adhesion
capillarity
surface tension
Correct answer is C
No explanation has been provided for this answer.
alpha particles
beta particle
gamma radiation
X-radiation
Correct answer is B
β Particles are equivalent to electrons but arise from radioactive decay of unstable atoms. They are emitted with a continuous range of energies up to a maximum that is characteristic of each radionuclide. Electrons have a greater range and penetrating power, but much less ionizing potential compared with α particles.
Beta particles are deflected by a magnetic field in an opposite direction to alpha particles confirming they must hold a charge opposite to alpha particles.