Physics Past Questions and Answers

The distance between two successive crests of a water wave is 0.5m. If a particle on the surface of the water wave makes two complete vertical oscillations in 1s, calculate the speed of the wave.

A 0.25ms^-1
B 0.50ms^-1
C 1.00ms^-1
D 2.00ms^-1
E 4.00ms^-1

Question 147:

In 90 seconds, the mass of a radioactive element reduces to \(\frac{1}{16}\) of its original value. Determine the half- life of the element.

A 15.0s
B 18.0s
C 22.5s
D 30.0s
E 45.0s

Question 148:

Which of the following statements about the concept of solid friction is NOT true?

A It always acts in the direction of motion
B It causes wear and tear in car tyres
C It depends on the nature of the surfaces in contact
D It is independent of the area of the surfaces in contact.
E It reduces the efficiency of the machine

Question 149:

The space surrounding a magnet in which the magnetic force is exerted is ____________

A Magnetic field
B Magnetic flux
C Magnetic point
D Magnetic pole
E Magnetic strength

Question 150:

Which of the following scientists postulated that moving particles exhibit wave properties?

A Ernest Rutherford
B Erwin Schroedinger
C Frank Hertz
D Louis de Broglie
E Werner Heisenberg.