What is the velocity of sound at 100 oC if the velocity of sound at 0 oC is 340ms -1?
- A. 497m-1
- B. 440m-1
- C. 397m-1
- D. 240m-1
A transverse wave and a longitudinal wave travelling in the same direction in a medium differ essentially in their
- A. frequency
- B. amplitude
- C. direction of vibration of the particles of the medium
- D. period of vibration of the particles of the medium
A wave that travels through stretched strings is known as
- A. electromagnetic wave
- B. micro wave
- C. mechanical wave
- D. seismic wave
The mechanism of heat transfer from one point to another through the vibration of the molecules of the medium is
- A. covection
- B. conduction
- C. radiation
- D. diffusion
The rise or fall of a liquid in a narrow tube is because of the
- A. viscosity of the liquid
- B. surface tension of the liquid
- C. friction between the walls of the tube and the liquid
- D. osmotic pressure of the liquid
What will happen to the boiling point of pure water when it is heated in a place 30m below sea level?
- A. It will be more than 100 oC
- B. It will be last than 100 oC
- C. It will still be at 100 oC
- D. It will be fluctuating
Steam from boiling water causes more damage on the skin than does boiling water because
- A. water has a high specific heat
- B. steam has latent heat of fusion
- C. the steam is at a highter temperature than the water
- D. steam brings heat more easily by convection
Two liquids X and Y having the same mass are supplied with the same quantity of heat. If the temperature rise in X is twice that of Y, the ratio of specific heat capacity of X to that of Y is
- A. 2:1
- B. 1:2
- C. 4:1
- D. 1:4
A gas at a pressure of 105Nm-2expands from 0.6m-3 to 1.2m3 at constant temperature, the work done is
- A. 7.0 x 106J
- B. 6.0 x 10 6J
- C. 6.0 x 10 5J
- D. 6.0 x 10 4J
A wire of length 100.0m at 30o has linear expansive of 2×10-5K-1 Calculate the length of the wire at a temperature of – 10oC
- A. 100.08m
- B. 100.04m
- C. 99.96m
- D. 99.92m
Calculate the length which corresponds to a temperature of 20oC if the ice and steam points of an unguarded thermometer are 400 mm apart
- A. 20mm
- B. 30mm
- C. 60mm
- D. 80mm
What volume of alcohol will have same mass as 4.2m-3 of petrol?
Density of alcohol = 8.4 x 10^2 kgm-3, density of petrol =7.2×10^2 kgm-3
- A. 0.8m3
- B. 1.4m3
- C. 3.6m3
- D. 49.m3
Calculate the work done when a force of 20N stretches a spring by 50mm.
- A. 0.5J
- B. 1.5J
- C. 2.0J
- D. 2.5J
If a pump is capable of lifting 5000kg of water through a vertical height of 60m in 15 min, the power of the pump is
- A. 2.2.5 x 10 5js-1
- B. 2.5 x 104js-1
- C. 3.3 x 103js-1
- D. 3.3 x 102js-1
An object is moving with a velocity of 5m-1. At what height must a similar body be situated to have a potential energy equal in value with kinetic energy of the moving body?
- A. 25.0m
- B. 20.0m
- C. 1.3m
- D. 1.0m
A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid?
[Density of the cork = 0.25 x 103kgm-3, Density of the liquid = 1.25 x 103kgm-3]
- A. 0.8
- B. 0.5
- C. 0.2
- D. 0.1
Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms-2.
[g = 10ms-2]
- A. 686N
- B. 595N
- C. 581N
- D. 105N
A train with an initial velocity of 20ms-1 is subjected to a uniform deceleration of 2m-2. The time required to bring the train to a complete halt is?
- A. 5s
- B. 10s
- C. 20s
- D. 40s
A simple pendulum of length 0.4m has a period of 2s. What is the period a similar pendulum of length 0.8m at the same place?
- A. 8s
- B. 4s
- C. 2\(\sqrt{2}s\)
- D. \(\sqrt{2}s\)
The pair of physical quantities that are scalar only are ?
- A. volume and area
- B. moment and momentum
- C. length and displacement
- D. Impulse and time
The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle 0f 30o with the resultant, find its magnitude.
- A. 100.0N
- B. 57.7N
- C. 43.3N
- D. 25.0N