NDA Physics 2019/2020 Past Questions

A force of 100N is used to kick a football of mass 0.8kg. Find the velocity with which the ball moves if it takes 0.8s to be kicked

A satellite is in parking orbit if its period is

A tuning fork of frequency 340Hz is vibrated just above a cylindrical tube of height 1.2m. If water is slowly poured into the tube, at what maximum height will resonance occur?

By what factor will the size of an object placed 10cm from a convex lens be increased if the image is seen in a screen placed 25cm from the lens?

Thermal equilibrium between two objects exist when

The principle of operation of an induction coil is based on

The equation ¹⁵⁰₆₂X → ¹⁵⁰₆₃Y + K, represents

Which of the following radiations cannot be deflected by an electric field or magnetic field? (i) a - rays, (ii) p - rays (iii) y - rays (iv) X - ray

The half-life of a radioactive element is 9 days. What fraction of atoms has decayed in 36 days .

Which of these is not a fundamental S.I. unit

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

The quality of sound depends on

A student with a sight defect has a least distance of distinct vision of 150 cm. For him to read a material placed at a distance of 25 cm, what is the focal length of the glasses he should wear?

A dynamo primarily converts

Three capacitors 2μF, 3μF, and 6μF are connected in series. If the pd across the system is 12v, the pd accross the 6μF capacitor is

Starting from rest a car of mass 1000kg accelerates steadily to 20m/s in 10 sec , what is the average power developed?

A gun of mass 0.1kg has a bullet of mass 0.1kg , the bullet leaves the piston when fired at a velocity of 200m/s, find the final velocity.

Which of the following pairs has one vector and one scalar quantity?

Two lamps rated 40W and 220v, each are connected in series. The total power dissipated in both lamps is___

If PHCN charges 5K per kwh, what is the cost of operating for 24hours a lamp requiring 1A on a 200V line.

The friction which operates when solid surface slides over another is called

Which of the following conclusions can be drawn from Newton's second law of motion?

In which of the following transitions does a solid changes directly into gases?

If M and R are the masses and radius of the earth respectively and G is the universal gravitational constant, the earth's gravitational potential at an attitude H above the ground level is

An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water is put in it, how long will it take for the temperature of water to rise from 20°C to 100°C (S. H. C of water = 4200JKg^-1K^-1

When current flows through a moving-coil galvanometer, the force exerted on the pointer-depends on the: (I) Strength of the current (II) Magnetic field strength (III) Length of the coil. Which of the statement(s) above is/are correct?

In a nuclear fission process, the mass defect was 1.2 × 10^-5kg. Calculate the energy released. [Speed of light in vacuum, c = 3.0 × 10⁸ms^-1]

Which of the following statements about a diode is correct?

In order for fibre optics to work, the incident light inside it must hit its wall at

In the earth's gravitational field.

Two plane mirrors are inclined at angle 45° one to another. A ray of light has incident angle 20° at the surface of the first mirror. The reflected ray is then incident on the second mirror.
Calculate the angle of reflection at the second mirror.

When the length of the string of a simple pendulum is L, its period is 0.5Π seconds. The period when the length is increased to 4L will be

The coefficient of linear expansion of aluminium is 23 x 10^-6K^-1. If the volume of a pot made with aluminum at temperature T_o is V_o, what will be the change in volume of the pot?

How much heat is given out when a piece of iron mass 50g and specific heat capacity 460Jkg^-1K^-1 cools from 85°c to 25°c?

Which of the following is not suitable method of reducing loss of heat from a piece of hot iron?

A bat emits a sound wave at a speed of 1650.00m/s and receives the echo 0.15 seconds later. Calculate the distance of the bat from the reflector

Which of the following is/are characteristics of sound? i pitch ii loudness ii Quality iv Noise

A device that converts mechanical energy into electrical energy is

When an air-column is set into vibrations, the distance between two consecutive nodes of the resultant wave is

In the wiring of houses, the fuse is connected to the wire coloured