UNIPORT Physics 2011/2012 Past Questions

2 spheres of masses 5kg and 10kg are 0.3m apart. Calculate the force of attraction between them [G = 6.67 × 10^-11Nm²Kg^-2]

A 200W heater is used to heat a metal object of mass 5kg initially at 10°C. If a temperature rise at 30°C is obtained after 10mm, the heat capacity of the material is

A boy drags a bag of rice along a smooth horizontal floor of 2N applied at angle of 600 to the floor. The work done after a distance of 3m is

A car of mass 1500kg goes round a circular curve of radius 50m at a speed of 40m/s. the magnitude of centripetal force on the car is

A converging lens of 15cm focal-length forms an image of an object placed 9cm from it. What is its position and magnification?

A gramophone record takes 5s to reach its constant angular velocity of 4πrad/s from the rest. Find its constant angular acceleration

A machine has a velocity ration of 4. If it requires 800N to overcome a load of 160N, what is the efficiency of the machine?

A piece of iron weighs 250N in air and 200N in a liquid of density 1000kg/m²

A ray of light is incident on an equilateral triangular glass prism of refractive index 3/2, Calculate the angle through which the ray is minimally deviated in the prism.

A reservoir 500m deep is filled with a fluid of density 850kg/m³, If the atmospheric pressure is 1.06 × 10⁵M/m²

A string of length 4m is extended by 0.02m when a load of 0.4kg is suspended at its end. What will be the length of the string when the applied force is 15N?[g = 10m/s²]

A tunning fork of frequency 340Hz is vibrated just above cylindrical tube of height 1.2m. If water is slowly poured into the tube, at what maximum height will resonance occur?[sppeed of sound in air = 340m/s]

A wire of 5Ωresistance is drawn out so that its new length is twice the original length. If the receptivity of the wire remains the same and the cross sectional area is halved, the new resistance is

An electron of charge 1.6 × 10^-19 is accelerated between 2 metal plates. If the kinetic energy of the electron is 4.8 × ^-17J. the potential difference between the plates is

An object is placed 20cm in front of a concave miror whose focal length is 10cm. where and how is the image formed?

Caesium has a work function of 3 × 10^-19J, the maximum energy of liberated electrons when it is illuminated by light of frequency 6.7 × 10¹⁴H is[h = 6.63 × 10^-34]

Given that Young's modulus for aluminium is 7.0 × 10¹⁰N/m² and density is 2.7 × 10³Kg/m³. Find the speed of sound produced is a solid bar is struck at one end with a hammer

If 1.2 × 106J of heat energy is given off in 1sec from a vessel maintained at a temperature gradient of 30km^-1, the surface area of the vessel is [thermal conductivity of the vessel = 400w/m/k]

Light ray is incident on air-glass inteface at angle of 70° to the interface. given that the refractive index of glass is 1.45, what refraction angle will theray make with the normal?

On a rainy dat of 20°C, the length of a steel truck is 2om, what will its length on a hot day with temperature of 40°C,

One of the following phenomena must occur whenever white light is dispersed

The count rate of a radioactive material is 800count/min. if the half-life of the material is 4 days, what would the count rate be 16 days later?

The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between wave B is

The vertical displacement experienced by a vibrating body during wave motion is called

Water in an open vessel boils at a lower temperature when heated at the mountain top because