Physics Past Questions And Answers
The equation PxVyTz = constant in charles' law when
- A. x = 1, y = -1, z = 1
- B. x = 0, y = 1, z = -1
- C. x = 1, y = 0, z = -1
- D. x = 0, y = 1, z = 1
A block and tackle system has six pulleys. a force of 50N applied to it lifts a load of weight W. If the efficiency of the system is 40%, calculate W
- A. 300N
- B. 200N
- C. 140N
- D. 120N
if ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆Px is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as
- A. ∆x ∆Px ≥ h
- B. ∆x ∆Px = 0
- C. ∆x ∆Px< h
- D. ∆x ∆Px = ∞
A lens that is thinner at the middle and thicher at the edges is
- A. diverging
- B. converging
- C. plano-convex
- D. converging meniscus
A metal sphere is placed on an insulating stand. A negatively charged rod is brought close to it. If the sphere is earthed and the rod is taken away, what will be the charge on the sphere?
- A. The sphere will remain neutral.
- B. The sphere will have a net negative charge.
- C. The sphere will have a net positive charge.
- D. The sphere will become polarized
The movement of fluid up or down a narrow tube is
- A. osmosis
- B. brownian motion
- C. capillarity
- D. diffusion
Natural radioactivity consists of the emission of
- A. α- particles and β-rays
- B. α- particles and X-rays
- C. α- particles, β - rays and y-rays
- D. γ- rays and X-rays
When light is incident on an object which is magenta in colour, which of the following colour would be absorbed?
- A. Red and blue
- B. Green only
- C. Red and green
- D. Red only
Which of the following remains unchanged as light travels from one medium to the other? i. speed. ii. wavelength. iii. frequency.
- A. i only
- B. ii only
- C. iii only
- D. i and ii only
A voltmeter is a device that
- A. draws high current
- B. has a very low resistance
- C. has a very high resistance
- D. is able to measure both voltage and current