Physics · General Science · NDA

An infinite combination of resistors, each having resistance $R = 4 \Omega$, is given below. What is the net resistance between the points A and B? (E...

An electric circuit is given below. $V_1 = 1 V$ and Resistance $R = 1000 \Omega$. The current through the resistance $R$ is very close to $1$ mA and ...

If the current through an electrical machine running on direct current is $15 A$ and the machine runs for $10$ minutes, the charge that passes through...

Which one of the following is the best shape of a solid metal rod to form the top end of a lightning conductor?

Which of the following forces is/are fundamental in nature?1. Gravitational force2. Electromagnetic forces3. Strong and weak nuclear forcesSelect the ...

A spherical shell of outer radius R and inner radius R/2 contains a solid sphere of radius R/2 (see figure). The density of the material of the solid ...

The human eye is like a camera that has a lens with :

A uniform meter scale of mass 0.24 kg is made of steel. It is kept on two wedges, W₁ and W₂, in a horizontal position. W₁ is at a distance of 0.2 m fr...

Escape speed from the Earth is close to 11.2 km s⁻¹. On another planet whose radius is half of the Earth's radius and whose mass density is four times...

Which one of the following does not apply to sound waves in fluids?

A ball of 0.1 kg mass is dropped on a hard floor from a height of 0.45 m and rises to a height of 0.2 m. If it was in touch with the floor for 0.1 s, ...

Which one of the following statements regarding simple pendulum is correct?Simple pendulum has a time period independent of amplitude:

Which one of the following about different frictional forces is correct?

A metallic bob X of mass m is released from position A. It collides elastically with another identical bob Y placed at rest at position B on a horizon...

Consider the two statements given below:Statement-1 : Infrared waves are also called heat waves.Statement-2 : Water molecules readily absorb infrared ...

If the block P as shown in the figure below were to be at rest, what should the magnitude of force F be?...

Of the following, which does not belong to a nuclear reactor?

Consider the following electric circuit : The current in the above electric circuit is :...

A microscope may be a combination of :

For a human eye, where u is the distance of an object from the eye, f is the focal length of the lens and v is the distance of image from the eye, whi...

Which of the following statements with regard to the phenomenon of the primary rainbow formation by water droplets is/are correct?1. It involves refra...

Which one of the following scientists mentioned that an electron in an atom could revolve in certain stable orbits without the emission of radiant ene...

LIGO experiment confirmed one of the predictions of :

A block of mass 2 kg, moving with the initial speed of 3 m/s comes to rest on a rough horizontal surface after travelling a distance of 3 m. The magni...

Which one of the following is primarily responsible for conduction of current in a metal?

The streaming of light beams coming from the Sun through trees is said to have suggested that light travels in straight line. The particles on the pat...

The flash of lightning is seen before the thunderstorm is heard. It verifies that

The potential difference between the two end terminals of an electric heater is 220 V and the current through it is 0.5 A. What would be the current t...

The heating element in an electric iron is usually made of

Sita, 1.5 m high, stands before a plane mirror fixed on a wall to view her full image. What should be the minimum height of the plane mirror so that S...

Which one of the following graphs correctly represents the current (I) - voltage (V) variation for a rectangular piece of a semiconductor wafer?

Which one of the following is the usual unit of measurement for Air Pressure used in India?

Ram records the odometer readings of his car for the distance covered from 2000 km at the start of his journey and 2400 km at the end of the journey a...

Ms. Rani decides to convert her AC generator into a DC generator. Which one of the following she would need to use?

Ramesh cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power

Which of the following statements are correct about the electrical resistance and resistivity of a wire? 1. Both quantities depend on the area of cro...

An iron nail sinks in water whereas an iron ship floats. Which of the following statements is correct in this regard? 1. Average density of ship is g...

Which of the following arrangement of resistors offers minimum effective resistance between points X and Y?

What will happen if a collection of positive and negative charges are passed at a high speed through a magnetic field which is perpendicular to the di...

The motion of a particle of mass m is described by the relation, y = ut - 1⁄2 gt2, where u is the initial velocity of the particle. The force acting o...

A block of wood 40 cm × 20 cm × 10 cm) is kept on a tabletop in three different positions: (a) with its side of dimensions 20 cm × 10 cm; (b) wit...

Which one of the following graphs represents the equation of motion v = u + at; where all quantities are non-zero and symbols carry their usual meanin...

Which one of the following statements is true for sound waves propa- gating in air?

A 100 g sphere is moving at a speed of 20 m/s and collides with another. sphere of mass 50 g. If the second sphere was at rest prior to the collision ...

Which one of the following optical phenomena supports that the light is a transverse wave?

How many of the following materials can be attracted by a magnet? 1. Plastic 2. Carbon 3. Aluminium 4. Stainless Steel Select the correct answer ...

Two identical spring balances S1 and S2 are connected one after the other and are held vertically as shown in the figure. A mass of 10 kg is hanging f...

A stone is thrown horizontally from the top of a 20 m high building with a speed of 12 m/s. It hits the ground at a distance R from the building. Taki...

A sphere of volume V is made of a material with lower density than water. While on Earth, it floats on water with its volume f1V (f1 < 1) submerged...

Two identical containers X and Y are connected at the bottom by a thin tube of negligible volume. The tube has a valve in it, as shown in the figure. ...

A particle is moving in a circle of radius R with a constant speed v. Its average acceleration over the time when it moves over half the circle is :

Two forces of 5⋅0 N each are acting on a point mass. If the angle between the forces is 60°, then the net force acting on the point mass has magnitude...

A rectangle ABCD is kept in front of a concave mirror of focal length f with its corners A and B being, respectively, at distances 2f and 3f from the ...

Shown in the figure are two plane mirrors XY and YZ (XY ⊥ YZ) joined at their edge. Also shown is a light ray falling on one of the mirrors and r...

A railway wagon (open at the top) of mass M1 is moving with speed v1 along a straight track. As a result of rain, after some time it gets partially fi...

Which one of the following statements is not true for a flute, a musical instrument?

A positive charge is moving towards south in a space where magnetic field is pointing in the north direction. The moving charge will experience :

Which one of the following astronomers proved that the Earth and other planets revolve around the Sun?

Sand falls vertically on a conveyor belt at a work rate of 0⋅1 kg/s. In order to keep the belt moving at a uniform speed of 2 m/s, the force required ...

The power required to lift a mass of 8⋅0 kg up a vertical distance of 4 m in 2 s is (taking acceleration due to gravity as 10 m/s2):

One block of 2⋅0 kg mass is placed on top of another block of 3⋅0 kg mass. The coefficient of static friction between the two blocks is 0⋅2. The botto...

A mass is attached to a spring that hangs vertically. The extension produced in the spring is 6 cm on Earth. The acceleration due to gravity on the su...

Which one of the following is an example of Second Class Lever?

In an electric circuit, a wire of resistance 10 Ω is used. If this wire is stretched to a length double of its original value, the current in the...

What is the total resistance in the following circuit element? ...

Which one of the following statements is true?

An electric bulb is rated as 220 V and 80 W. When it is operated on 110 V, the power rating would be:

In the dispersion of white light by a common glass prism, which one among the following is correct?

Which one among the following is true for the speed of sound in a given medium?

Which one of the following telescopes contains only mirrors?