Question Library

Water is not a good thermometric liquid because it?

Which of the units of the following physical quantities are derived? I. Area II. Thrust III. Pressure IV. Mass

A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?

Which of the following quantities is not an example of force?

The acceleration of a moving object can be determined from the?

The handle of a screw jack is 35 cm long and the pitch of the screw is 0.5 cm. What force must be applied at the end of the handle to lift a load of 2000N, if the efficiency of the jack is 30% [\pi = \(\frac{22}{7}\)]?

A current of 2A passes through a wire of resistance 4\Omega for 3 minutes. Calculate the energy lost.

Which of the following statements best describes the particles in a solid at room temperature? They are

A force of 10 N, acting continuously, increases the kinetic energy of an object from 20.J to 60 J. Find the distance moved by the object.

The following statements about a loudspeaker are correct except?

An ice cube has mass of 20 g at 5^\circC. Calculate the energy required to raise its temperature to 0^\circC. [Specific heat capacity of ice = 2.1 J/g^\circc]

A stone is thrown horizontally with initial velocity 15m/s from a tower 20 m high. How long does it take to reach the ground? [g= 10m/s\(^2\)

According to Pascal's principle, the pressure in a fluid is always?

(a)(i) State Hooke's law. (ii) A spring has a length of 0.20 m when a mass of 0.30 kg hangs on it, and a length of 0.75 nm when a mass of 1.95 kg hangs on it. Calculate the: (i) force constant of the spring; (ii) length of the spring when it is unloaded. [g = 10m/s\(^2\)] (b)(i) What is diffusion? (ii) State two factors that affect the rate of diffusion of a substance. (iii) State the exact relationship between the rate of diffusion of a gas and its density. (c) A satellite of mass, m orbits the earth of mass. M with a velocity, v at a distance R from the centre of the earth. Derive the relationship between the period T, of orbit and R.

c(ii) (a)(i) Define dew point. (ii) Explain why dew forms more quickly on the metal parts than on the rubber parts of a bicycle placed in the open overnight. (b)(i) Explain the statement. the specific heat capacity of copper is 400 J/kg/K. (ii) Two metals, P and Q are supplied with the same quantity of heat. If the ratio of the specific heat capacity of P to Q is 3: 1 and their masses are in the ratio I:2 respectively. calculate the ratio of the temperature rise of P to Q. (c)(i) Define coefficient of thermal conductivity of a material. The diagram above c(ii) illustrates a composite bar of iron and copper. The bar is insulated along its sides and it has a diameter of 10 mm. The length and thermal conductivity of the iron are 0.15 m and 40 W/m/K, respectively and those of copper are 0.05 m and 360 W/m/K, respectively. If the free ends of the iron and copper are kept at 100^\circC and 0^\circC respectively. calculate the (i) temperature at the interface between the bars; (ii) rate of heat flow along the bar.