Physics Past Questions and Answers

in a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively, what is the voltage across the capacitor?

A 30V
B 40V
C 50V
D 70V

Question 1657:

In the Rutherford scattering experiment, a beam of alpha particles was fired at a thin gold film with some of the particles being considerably deflected. This shows that

A A gold nucleus contains protons, neutrons and electrons uniformly distributed in a tiny volume
B The gold nucleus is positively charged and is concentrated in a tiny volume
C The gold nucleus emitted alpha particles
D The gold nucleus is concentrated in a tiny volume and contains alpha particles

Question 1658:

2311Na + Proton â†’ pqX + alpha particle What are the values of p and q respectively in the equation above?

A 10 and 20
B 12 and 24
C 20 and 10
D 24 and 12

Question 1659:

A semiconductor diode is used in rectifying alternating current into direct current mainly because it

A Allows current to flow in either direction
B Is non-linear
C Offers a high input resistance
D Allows current to flow only in one direction

Question 1660:

if âˆ†x is the uncertainty in the measurement of the position of a particle along the x-axis and âˆ†Px is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as

A âˆ†x âˆ†Px â‰¥ h
B ∆x ∆Px = 0
C âˆ†x âˆ†Px < h
D âˆ†x âˆ†Px = âˆž