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?

Which one of the following statements about earthquake waves is not correct?

The commercial unit of electrical energy is kilowatt-hour (kWh), which is equal to

Which one of the following statements regarding a current-carrying solenoid is not correct?

An object is made of two equal parts by volume; one part has density ρ0, and the other part has density 2ρ0. What is the average density of the object...

A pressure cooker cooks food faster by

Which one of the following wavelengths corresponds to the wavelength of X-rays?

An electric bulb is connected to 220 V generator. The current drawn is 600 mA. What is the power of the bulb?

When the pitch of sound increases, which one of the following increases?

To help deep-sea divers breathe, they carry cylinders of oxygen mixed with

Human eye can see objects at different distances with contrasting illuminations. This is due to

What is the nature of velocity-time graph for a car moving with uniform acceleration?

The amplitude of sound waves is measured in the units of

A current of 0.6 A is drawn by an electric bulb for 10 minutes. Which one of the following is the amount of electric charge that flows through the cir...

A DC generator works on the principle of

The presence of magnetic field can be determined using which one of the following instruments?

Which one of the following statements about speed and velocity is correct?

Two convex lenses have focal lengths of 50 cm and 25 cm, respectively. If these two lenses are placed in contact, then the net power of this combinati...

Which one of the following terms cannot represent electrical power in a circuit?

The refractive index of crown glass is close to 3/2. If the speed of light in air is c, then the speed of light in the crown glass will be close to

The volume of a sealed packet is 1 liter and its mass is 800 g. The packet is first put inside the water with a density of 1 g cm-3 and then in anothe...

A simple pendulum having bob of mass m and length of string l has time period of T. If the mass of the bob is doubled and the length of the string is ...

In which one of the following devices, the light energy is converted into the electrical energy?

SONAR is a device that is used to measure the distance of underwater objects by a ship. Which of the following types of waves does it use for this pur...

Which one of the following statements about the speed of sound waves is not correct?

Which one of the following metals is most commonly used for making filament of incandescent electric bulbs?

A bullet of mass 10 g is horizontally fired with velocity 300 m s-1 from a pistol of mass 1 kg. What is the recoil velocity of the pistol?

A microphone converts

Inhabitants are unaware of the speed of rotation of the planet Earth because 1. the angular velocity is constant for each place on the Earth's surfac...

The twinkling of a star is due to the atmospheric

A mass M is dragged by a pulley on a horizontal plane by a force anti-parallel to its displacement. The work done in pulling the mass M is

A 5 N force is defined when a mass of 10 kg is accelerated with

A boy of mass 52 kg jumps with a horizontal velocity of 2 m/s onto a stationary cart of mass 3 kg. The cart is fixed with frictionless wheels. Wh...

The energy possessed by a body due to its change in position or shape is called 

A sound wave has a frequency of 1 kHz and wavelength 50 cm. How long will it take to travel 1 km?

What is the mass of a material, whose specific heat capacity is 400 J/(kg °C) for a rise in temperature from 15°C to 25°C, when heat received is 20 kJ...

The specific latent heat of vaporization of a substance is the quantity of heat needed to change unit mass from

Evaporation from the surface of a given liquid takes place more rapidly when

Which of the following statements correctly explains/explain the existence of a positive force between two electric charges? 1. Both the charges are ...

An electric wire of resistance 50 ohm is cut into five equal wires. These wires are then connected in parallel. What is the equivalent resistance of t...

The electric field lines from an isolated positively charged conducting sphere are

The frequency of an alternating current is 3 Hz. It implies that

Which one of the following correctly represents the SI unit of resistivity?

What is the current required to light a 60 W incandescent bulb in a domestic supply of 240 V ?

The magnetic field produced by a current-carrying straight wire at a point outside the wire depends

What is the dimension of gravitational constant?

 A ball is thrown vertically upward with a speed of 40 m/s. The time taken by the ball to reach the maximum height would be approximately ...

The time period of a 1 m long pendulum approximates to

All objects experience a buoyancy when they are immersed in a fluid. Buoyancy is

According to Fleming's right-hand rule, if the forefinger indicates the direction of the magnetic field and the thumb shows the direction of motion of...

Two resistors R1 and R2 arranged in parallel combination in an electrical closed circuit are made of the same material and of the same thick...

What is the magnification produced by a concave lens of focal length 10 cm, when an image is formed at a distance of 5 cm from the lens?

A wooden box of mass 2 kg and dimensions (30 cm × 15 cm × 10 cm) is placed on a table with sides 30 cm and 10 cm touching the tabletop. Whic...

Why are the tyres of aircrafts made of conducting rubber? 1. So that the charge accumulated on the aircraft in flight, by rubbing the air, can easily...

Which one of the following statements with respect to Global Positioning System (GPS) is not correct?