Physics Past Questions And Answers
If the stress on a wire is 107NM-2 and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young's modulus of the wire is
- A. 5 . 0 x 104 Nm-2
- B. 5 . 0 x 105 Nm-2
- C. 2 . 0 x 108 Nm-2
- D. 2 . 0 x 109 Nm-2
Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss; Specific heat capacity of copper = 400JKg-1K-1 Latent heat of fusion of ice = 3.3 x 105JKg-1
- A. 8/33kg
- B. 33/80kg
- C. 80/33kg
- D. 33/8kg
I. Temperature. II. Density of air molecules III. Pressure IV. Pitch Which of the above will affect the velocity of sound in the air
- A. I and II only
- B. II and IV only
- C. I,II and IV only
- D. I,II,III nad IV
A source of sound produces waves in air of wavelength 1.65m. If the speed of sound in air is 330ms−1, the period of vibration in air is?
- A. 200
- B. 0.005
- C. 0.5
- D. 0.02
Which of the following statements correctly defines a simple machine? a device
- A. that can provide electric current
- B. which can only carry people from one place to another
- C. with which work can be done easily
- D. which changes the state of rest or of uniform motion of an object along a straight line
The characteristic of a vibration that determines its intensity is the
- A. Frequency
- B. Overtone
- C. Wavelength
- D. Amplitude
A lamp is rated 240V, 60W. The resistance of the filament is
- A. 960\(\Omega\)
- B. 16\(\Omega\)
- C. 15\(\Omega\)
- D. 4\(\Omega\)
The mass of a load is doubled while the force acting on it is halved. The resulting acceleration of the load is
- A. quadrupled
- B. quartered
- C. halved
- D. doubled
The half-life of a radioactive material is 6hrs. What quantity of 1kg of the material would decay in 24 hours?
- A. 15/16kg
- B. 1/2kg
- C. 1/4kg
- D. 1/16kg
A ball is dropped and it hits the floor at a point A. It rebounds upward to a point B. While moving from A to B its?
- A. kinetic energy is increasing
- B. potential energy is increasing
- C. potential energy is decreasing
- D. kinetic energy remains constant