The equation of a wave traveling in a horizontal direction is expressed as y = 15 sin 2/5 (60t – x) what is its wave length?
- A. 60m
- B. 15m
- C. 5m
- D. 2m
I. It is a rapid, constant and irregular motion of tiny particles. II. It gives evidence that tiny particles of matter called molecules exist. III. It takes place only in gases. IV. It gives evidence that molecules are in a constant state of random motion. which of the combinations above is correct about Brownian notion?
- A. I,II and III only
- B. II,III and IV only
- C. I,III and lV only
- D. l, ll and lV only
The quantity of heat energy required to melt completely 1 kg of ice at – 30oC is
[latent heat of fusion = 3.5 x 10 5Jkg -1, specific heat capacity of ice = 2.1×10 3Jkg -1K -1]
- A. 4.13x10 6J
- B. 4.13x10 5J
- C. 3.56x10 4J
- D. 3.56x10 2J
Which of the following is NOT a factor that can increase the rate of evaporation of water in a lake?
- A. increase in the pressure of the atmosphere
- B. rise in temperature
- C. increase in the average speed of the molecules of water
- D. increase in the kinetic energy of the molecules of water
Calculate the temperature change when 500J of heat is supplied to 100g of water
- A. 12.1oC
- B. 2.1oC
- C. 1.2oC
- D. 0.1oC
2000cm3 of a gas is collected at 27oC and 700mmHg. What is the volume of the gas at standard temperature and pressure?
- A. 1896.5cm3
- B. 1767.3cm3
- C. 1676.3cm3
- D. 1456.5cm3
Two metals P and Q are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of their
length is 3: 4 respectively, the ratio of the increase in lengths of P to Q is
- A. 1:2
- B. 2:1
- C. 8:9
- D. 9:8
Clinical thermometers are examples of
- A. pressure gas thermometer
- B. resistance thermometer
- C. alcohol thermometer
- D. mercury- in - glass thermometer
A balloon whose volume is 300m3 is filled with hydrogen. If the density of air is 1.3 kgm-3, find the upthrust on the balloon. [g = 10ms-2]
- A. 3000N
- B. 3800N
- C. 3900N
- D. 4200N
The pressure at any point in a liquid at rest depends only on the
- A. depth and the density
- B. mass and the volume
- C. quantity and the surface area
- D. surface area and the viscosity
An object of volume 1 m 3 and mass 2kg is totally immersed in a liquid of density 1 kgm-3 . Calculate its apparent weight.
- A. 20N
- B. 10N
- C. 2N
- D. 1 N
If a load of 1 kg stretches a cord by 1.2cm, what is the force constant of the cord? {g=10ms-2}
- A. 866Nm-1
- B. 833Nm-1
- C. 769Nm-1
- D. 667Nm-1
A block and tackle is used to raise a load of 250N through a vertical distance of 30m. What is the efficiency of the system if the work done against friction is 1500J?
- A. 62.5%
- B. 73.3%
- C. 83.3%
- D. 94.3%
An object of mass 20kg slides down an inclined plane at an angle of 30o to the horizontal. The coefficient of static friction is?
[g = 10ms-2]
- A. 0.2
- B. 0.3
- C. 0.5
- D. 0.6
An object moves in a circular path of radius 0.5m with a speed of 1ms-1 What is its angular velocity?
- A. 8 rads-1
- B. 4 rads-1
- C. 2 rads-1
- D. 1 rads-1
If a freely suspended object is pulled to one side and released, it oscillates about the point of suspension because the
- A. acceleration is directly proportional to the displacement
- B. motion is directed away from the equilibrium point
- C. acceleration is directly proportional to the square of the displacement
- D. velocity is minimum at the equilibrium ponit
A rocket is fired from the earth’s surface to a distant planet. By Newton’s law of universal gravitation, the force F will
- A. increase as r reduces
- B. increase as G varies
- C. remains constant
- D. increases as r increases
A car starts from rest and moves with a uniform acceleration of 30ms-2 for 20s. Calculate the distance covered at the end of the motion
- A. 6km
- B. 12km
- C. 18km
- D. 24km
Calculate the total distance covered by a train before coming to rest if its initial speed is 30ms-1 with a constant retardation of 0.1m-2
- A. 5500m
- B. 4500m
- C. 4200m
- D. 3000m
A load is pulled at a uniform speed along a horizontal floor by a rope at 45o to floor. If the force in the rope is 1500N, what is the frictional force on the load ?
- A. 1524N
- B. 1350N
- C. 1260N
- D. 1061N
In order to remove the error of parallax when taking measurements with a metre rule, the eye should be focused
- A. slantingly towards the right on the markings
- B. slantingly towards the left on the markings
- C. vertically downwards on the markings
- D. vertically upwards on the markings