UI Physics 2020/2021 Past Questions

A slight loading of a tuning fork has the effect of:

The fundamental frequency of a plucked wire under a tension of 400 N is 250 Hz. When the frequency is changed to 500 Hz at a constant length. the tension is ___.

Which of the following is true of light and sound waves?

A flat plate is cut in the shape of a square of side 20.0 cm with an equilateral triangle of side 20.0 cm adjacent to the square. Calculate the distance of the centre of mass from the apex of the triangle.

The earth retains its atmosphere because?

The principle of operation of an induction coil is based on __.

A concave lens of focal length 20cm forms an image 1/2 the size of the object. The object distance is __.

Isotopes of an element contains __.

A convex lens of focal length 10.0cm is used to form a real image which is half the size of the object. How far from the object is the image?

The silver wall of a vacuum flask prevents heat loss due to

A hydrogen tank of volume 0.08m³ at constant temperature is filled to a pressure of 30, 000kPa. What was the original volume of the hydrogen when it was at a pressure of 2 atmosphere? (1 atm = 100kPa)

The velocity ratio of a machine is 5 and its efficiency is 75%. What effort would be needed to lift a load of 150N with the machine?

An electric generator with a power output of 3.0kW at a voltage 1.5kV distributes power along cables of resistance 20.0Ω. The power loss in the cables is

The rate at which heat is transferred from one point to another in a material depends on its

A solid of mass 0.5kg initially at 50°C melts at 60°C. Calculate the quantity of heat required to melt it completely. [Specific heat capacity of the solid = 2.0 kJkg^-1K^-1, Specific latent heat of fusion of solid = 1.0 kJkg^-1]

An electron moves with a speed of 2.0 × 10⁸ms^-1 in a straight line. Calculate the wavelength of the electron wave. [mass of an electron = 9.1 × 10^-31Kg, Planck's constant = 6.6 × 10^-34]

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

One of the features of fission process is that

The water in a swimming pool appears to be 1.5m deep. The refractive index of water is 1.33. What is the real depth of the water in the swimming pool?

Which of the following statements is/are always true? (I) Latent heat of vaporisation of any substance is always greater than that of its fusion (II) Heat transfer by convection requires no materials medium (III) Conduction take place in solids

Which of the following thermometer can be used to measure high temperature up to 1000°C?

In a simple pendulum experiment, a student increased the length of an inextensible string by a factor of 9, by what factor is the period increased?

What is the resistance of the filament of an electric lamp rated 220V, 100W?

Which of these gives the dimension of Torque?

A ball of mass 0.1kg moving horizontal velocity of 15m/s is hot into a wooden block of mass 0.4kg lying at rest on a smooth horizontal surface. Find their common velocity after impact.