NDA Physics 2011/2012 Past Questions

An electron is placed mid-way between an electron of charge 1C and a proton of charge 1C separated by a distance of 2m. What is the magnitude of the force experienced by the electron?

Three-point charge Q1 = +10 x 10^-12C, Q2 = -6.0 x 10^-12C and Q3 +10 x 10^-12C are situated at the corners of an equilateral triangle of side 10 m in vacuum. The electric potential at the centre of the triangle is ___.

The direction of the magnetic field at a point in the vicinity of a bar magnet is ___.

A transformer has 300 turns of wire in the primary coil and 10 turns in the secondary coil. If the input voltage is 100 V. The output voltage is ___.

The current sensitivity of a galvanometer can be increased if __.

The flux through certain torpid changes from 0.65 mWb to 0.91 mWb when the air cone is replaced by another material. The relative permeability is

What is the power of an electric motor which does 6000 J of work per minute?

The most accurate instrument for comparing the emf of two cells is the

Several 40Ω resistors are to be connected so that 15A flows from a 120 V source. This can be done by ___.

A bead travelling on a straight wire is brought to rest at 0.2 m by friction. If the mass of the bead is 0.01 kg and the coefficient of friction between the bead and the wire is 0.1. Determine the work done by the friction.

On top of a spiral spring of force constant 500Nm^-1 J is placed a mass of 5 x 10^-3J kg. If the spring is compressed downwards by a length of 0.02 m and then released, calculate the height to which the mass is projected.

A test tube of radius 1.0cm is loaded to 8.8g. If it is placed upright in the water, find the depth to which it would sink.
(g = 10ms^-2 ,density of water = 1000gm^-3 )

A hose of cross-sectional area 0.5m² is used to discharge water from a water tanker at a velocity of 60ms^-1 in 20s into a container. If the container is filled completely, the volume of the container is ___.

If an object just begins to slide on a surface inclined at 30% to the horizontal, the coefficient of friction is ___.

A force of 1000 N is used to kick a football of mass 0.8 kg, Find the velocity with which the ball moves if it takes 0.8s to be kicked.

Water does not drop through an open umbrella of silk material unless the inside of the umbrella is touched. This is due to ___.

The stylus of a phonograph record exerts a force of 7.7 x 10^-2N on a groove of radius 10 x 10^-5m, Compute the pressure exerted by the stylus on the groove.

A piece of stone attached to one end of a string is whirled round in a horizontal circle and the string suddenly cuts. The stone will fly off in a direction.

Which of the following is in a neutral equilibrium?

Which of the following assumptions is made in a simple pendulum experiment? The:

Mercury is suitable as a barometric fluid because it:

Which of the following properties makes metals ideal for cooking utensil?

A wave has a frequency of 2Hz and a wavelength of 30cm. The velocity of the wave is:

Which of the following instruments has a pure tone?

When a transformer has more secondary windings than primary windings it:

Which of the following media allow the transmission of sound waves through them?
I. Air.
II. Liquids.
III. Solids.

Which of the following factors affects the speed of sound in air?
I. Temperature
II. Pressure
III. Frequency

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

I. Mass
II Density
III. Temperature
IV. Nature of substance
Which of the above affect diffusion?

The differences observed in solids, liquids and gases may be accounted for by ___.

The blade of a hoe feels colder to touch in the morning than the wooden handle because the ___.

I. They should be identical.
II. They should originate from the same source.
III. They should be coherent
IV. They should be monochromatic
From the statements above, the conditions for two waves to interfere are

In a large telecommunications auditorium, perforated absorbent materials are used to line the ceiling so as to ___.

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 ___.

The phenomenon of light bending around an obstacle is ___.

The instrument used by designers to obtain different colour patterns is called ___.

A glass plate 0.9 cm thick has a refractive index of 1.50. How long does it take for a pulse of light to pass through the plate?

When an object is placed between the principal focus and the optical centre of a convex lens. it could be used as ___.