The area under a force-time graph represents:

From the principle of flotation, a body sinks in a fluid until it displaces a quantity of fluid equal to its own:

For three identical steel balls (Q, R, S) on undulating ground, which is or are in neutral equilibrium?

If a simple pendulum's length increases by a factor of four, by what factor is its period increased?

The linear expansivity α, and cubic expansivity, $\gamma$ of a material are related by the equation

Which graph shows a body moving with uniform retardation?

The relationship between displacement s of a particle initially at rest and time t is:

The Joule is equivalent to

For a fixed mass of gas in an in expansible container, which is correct? I. Molecules' speed increases, II. Temperature increases, III. Molecules hit walls more often.

An example of a mechanical wave is

Which description of an image in a plane mirror is incorrect?

The efficiency of a wheel and axle is 100% and the ratio of their radii is  5:1 radius, calculate the effort required to lift a load of mass 20 kg using this machine. { g = 10ms^2}

A freely suspended compass needle settles in a plane called:

An object is placed at different distances, u, from a converging lens of focal length, 15.0 cm. For what value of u does the lens act as a simple microscope?

The periodic rise and fall in the intensity of sound from two notes is called:

If a lens has a power of +2.5 D, what is its radius of curvature?

A large number of turns in a galvanometer coil serves to:

Two parallel conductors carrying current in the same direction will:

The period of a 10 kHz radio wave traveling at 3.0 times 10^8 ms^-1 is:

A magnetic material with high electrical resistance and high permeability is a:

A body of mass m and velocity v having an associated wavelength lambda is called the:

Regarding a current-carrying wire in a magnetic field, which is correct?

Three cells each of emf, 1.1 V, and internal resistance, 2 Ω, are connected in parallel across a 3 Ω resistor. Determine the current in the resistor.

Regarding electric potential energy, which is correct?

A 20 mA, 395 Omega galvanometer is converted to read 8 V. Its internal resistance is:

A 10 H inductor in a 50 V, 100 Hz a.c. circuit has a current of:

Fast neutrons in a nuclear reactor are slowed by:

At resonance in a series R-L-C circuit, the impedance is:

A 240 V, 60 W lamp has a resistance of:

The main reason for earthing electrical appliances is to:

In doping an intrinsic semiconductor to produce a p-type semiconductor,

Arrange the following radiations in order of increasing ionization of air. I. Alpha II. Gamma III. Beta

Gamma rays are produced when

The half-life of a radioactive substance is 15 hours. If at some instance, the sample has a mass of 512 g, calculate the time it will take ¾ of the sample to decay.

When the direction of vibration of the particles of a medium is perpendicular to the direction of propagation of a wave, the wave is said to be

A hunter fires a gun at a point 408 m away from a cliff. If he hears an echo 2.4 s later, determine the speed of the sound wave.

The distance between the fixed points of a mercury-in-glass thermometer is 30 cm. Determine the temperature when the mercury level is 10.5 cm above the lower fixed point.

Which of the following statements about electromagnetic waves is not correct?

The diameter of a brass ring at 30 °C is 50.0 cm. To what temperature must this ring be heated to increase its diameter to 50.29 cm? [linear expansivity of brass = 1.9 × 10⁻⁵ K⁻¹]

Which of the following concepts is a method of heat transfer that does not require a material medium?

Which of the following statements about light travelling from one material medium to another is not correct?

The engine of a car provides a forward force of 1240 N and the total resistive force on the car is 800 N. If the mass of the car is 1220 kg, determine the distance the car has to travel from the rest before acquiring a speed of 4 ms^-1.

A quantity of water at 0 degree Celsius is heated to 30 degree C. For each degree rise in temperature, its density will

A small object of mass 50 g is released from a point A. Determine the velocity of the object when it reaches a point B, a vertical distance of 30 m below A. [g = 10 ms^-2]

Molecules move in random motion within a liquid. The total internal energy of the liquid depends on all of the following except its

The viscosity of a fluid depends on the following factors except the

Using vernier calipers, which of the following readings gives the correct measurement for the length of a rod?

The basic principle of operation of a beam balance is

In which of the following situations is friction not useful?