+2 Physics

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CLASS 12 FULL PHYSICS

These MCQs are intended for checking your PhysicsAll Chapters  knowledge!!

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According to Yukawa’s theory of nuclear forces, the origin of nuclear force between nucleons is due to the exchange of

Ferrites may be:

Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be zero, the value of Q will be :

A broadcast circute broadcasts at 300 m band. A condenser of capacitance 2.4 lµF is available. The value of the inductance required for resonant circuit is:

The density of a nucleus is of the order of:

The dielectric constant of a metal is:

The dimensional formula of impedance is;

Bonds in a semiconductor :

The concept of electron spin was introduced by:

Circular loop of radius 0.0157 m carries a current 2 A. The magnetic field at the centre of the loop is :

Which of the following effects is not shown in alternating current ?

If radio active nuclei emits β-particle, then mass-number:

The binding energy of a deuteron is about:

Poisson’s bright spot was discovered by:

Two wires of copper are of the same length but’have different diameters. When they are connected in series across a battery, the heat generated is H1 When connected in parallel across the same battery, the heat generated during the same time is H2 Then :

Kirchhoff's first and second laws for electrical circuits are consequences of:

Displacement current is always :

The energy equivalent to one atomic mass unit is :

When a polaroid is rotated, the intensity of light varies but never reduces to zero. It shows that the incident light is:

if an electric dipole is kept in a uniform electric field then resultant electric force on it is :

Which of the following has higher magnetic susceptibility?

Transmutation of nuclei was discovered by:

Increase in frequency deviation results into:

What is the ratio of inductive and capacitance reactance in an ac circuit?

A wire of resistance 3 Ω is cut into three pieces, which are then joined to form a triangle. The equivalent resistance between any corners of the triangle is :

If two conducting sphere are connected after charging separately then:

The dimensional representation of cu will be :

A beam of light is incident at 60° to a plane surface. The reflected and refracted rays are perpendicular to each other. What is the R.I. of the surface:

Electromagnetic waves have a speed of

In reverse biasing:

When the mass of a sample of a radioactive substance decreases, the mean life of the sample:

The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary is 10. If 240 V a.c. is applied to primary, the output from the secondary

Energy bands in solids are a consequence of:

Which of the following cannot be polarised?

What is the reason for your answer to the above question?

Semiconductors of both p-type and n-type are produced by:

On reflection from a denser medium, a light wave suffers a phase difference of:

Ampere’s circuital law was modified by:

The current sensitibility of a moving coil galanometer increases with decrease in:

The ground state energy of Hydrogen atom is -13.6 eV. What is the potential energy of electron in this state?

The magnetic lines of force inside a bar magnet:

To obtain p-type silicon semiconductor, we need to dope pure silicon with:

The magnetic field strength due to a short bar magnet directed along its axial line at a distance r is B. What is its value at the same distance along the equatorial line?

A bird sitting on a high power line:

The graph drawn between V are r for a non-conducting charged solid sphere of radius R for r < R will be :

When light travels from one medium to another, which of the following does not change?

Which of the following EMW has highest wavelength?

Transformer works on the principle of:

Two sources of light are said to be coherent when both give out light waves of the same:

Communication channel consists of:

A transformer is used to light 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A. Then the efficiency of the transformer is:

The resistance of a human body is about:

A magnetic dipole moment is a vector quantity directed from:

What happens if one of the slits, say S1 in Young’s double , slit experiment-is covered with a glass plate which absorbs half the intensity of light from it?

The total energy that will be released if a nucleus is built from its constituents is called the:

EMW are produced by:

The velocity of electromagnetic wave is:

The term used “to collect the information about an object and a place without physical contact” is called :

The dimensional formula of L/R is similar to that of:

Light Year is the unit of:

The coupling co-efficient of the perfectly coupled coils is:

If I current is flowing inductance L, then the dimension of 3/2 LI² is equivalent to:

An EMW of v = 3 MHz passes from vacuum into dielectric medium with permittivity Er = 4, then:

A parrot comes and sits on a bare high power line. It will:

An iron core transformer with a turns ratio of 8 : 1 has 120 V applied across the primary. The voltage across the

According to Bohr’s theory of hydrogen atom, the radius r of stationary orbit are related to principal quantum number n as:

Artificial radioactivity was discovered by:

For sustained interference, we need two sources which
emit radiations :

The branch of optics dealing with the formation of images using the concept of straight line propagation of light is called:

The sensitivity of a tangent galvanometer can be increased by increasing:

Which of the following radiations cannot eject photo electrons?

A capacitor is connected to a cell of emf E having some internal resistance r, the potential across the:

A single slit diffraction pattern is obtained using a beam of red light What happened the red light is replaced by the blue light?

The amount of work required to increase the distance between -6µC and 4µC from 6 cm to 18 cm will be :

The capacitance of a capacitor will decrease if we introduce a slab of:

What is the angle of dip at a place where the horizontal component of earth’s magnetic field is equal to the vertical component?

hen placed in a uniform field, a dipole experiences:

Two copper spheres of the same radius, one solid and the other hollow, are charged to the same potential. Which will have more charge?

Two capacitors of capacitance 6 µF and 4 µF are put in series across a 120 V battery. What is the potential difference across the 4 µF capacitor ?

The audio frequencies range from:

Tangent law is applicable only when:

For germanium crystal, the forbidden energy gap in joules

S.I. unit of flux is :

The phase difference between the flux linkage and the emf in a rotating coil in a uniform magnetic field is:

Name the man who was first to place his foot on the moon and in which year:

The phase difference b/w the A.C. and e.m.f. π/2 Which of the following can not be the instituent of the circuit?

Which of-the following is not a property of light?

Displacement current is due to:

The magnetic flux linked with a coil is inversely proportional to the?

The number of electrons that constitute 1 A of current is:
(a) (b)
(c)
(d)

Given three equal resistors, how many different combinations (taken all of them together) can be made?

In space communication, the sound waves can be sent from one place to another:

Choose the SI unit of electric potential energy :

Which of the following is not a unit of magnetic induction?

Who undertook the first space walk and in which year?

On applying reverse bias to a junction diode, it:

The space waves which are affected seriously by atmospheric conditions are:

Which of the following has a low value in ferrites?

The angle of minimum deviation of a prism depends upon the aggie of:

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CLASS 11 FULL PHYSICS

These MCQs are intended for checking your PhysicsAll Chapters  knowledge!!

for more new questions refresh this page !!

The force required to produce an acceleration of 2 m/s² on a mass of 2 kg is

To demonstrate the phenomenon of beats we need

The value of g at a particular point is 9.8 m/sec² suppose the earth suddenly shrink uniformly to half its present size without losing any mass. The value of g at the same point (assuming that the distance of the point from the centre of the earth does not shrink) will become

What is the dimensional formula of magnetic field?

One radian is equal to?

When a particle performing uniform circular motion of radius 10 cm undergoes the SHM, what will be its amplitude?

The process of heat transfer in which heat is transferred with actual migration of medium particles is known as (AFMC-94)

A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is

A passenger sitting in a bus moving at uniform speed, feels pushed backward whenever the bus is accelerated forward. This type of force is called

According to kinetic theory of gases, at absolute zero of temperature
(a)
(b)
(c) (d)

A boy starts from a point A, travels to a point B at a distance of 1.5 km and returns to A. If he takes one hour to do so, his average velocity is

If the radius of the earth were to be raise by 1% its mass remaining the same, the acceleration due to gravity on the surface of the earth will

The escape velocity for a body projected vertically upwards from the surface of the earth is 11 km/s. If the body is projected at an angle of 450 with the vertical, the escape velocity will be

Unit of Stefans constant is given by

When the angle of contact between a solid and a liquid is 90°, then

The mass of a body is 2 kg. It weight is

A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same, which one of the following will not be affected?

A particle moves on a circular path with decreasing speed. Choose the correct statement.

Atomic and molecular phenomena are dealt with by

When the linear momentum of a particle is increased by 1% its kinetic energy increases by x%. When the kinetic energy of the particle is increased by 300%, its linear momentum increases by y%. The ratio of y to x is

In damped oscillation the directions of the restoring force and the resistive force

For a diatomic gas change in internal energy for a unit change in temperature for constant pressure and constant volume is U1 and U2 respectively. What is the ratio of U1 and U2?

The atmospheric pressure is 106 dyne/cm². What is its value in SI unit?

The upper end of wire 1 m long and 2 mm radius is clamped. The lower end is twisted through an angle of 45°. The angle of shear is

The motion of a particle executing simple harmonic motion is given by X = 0.01 sin 100p (t + 0.05), where X is in metres ant t in second. The time period in second is

The displacement in metres of a body varies with time t in second as y = t2 – t – 2. The displacement is zero for a positive of t equal to

If a body of mass m is taken out from a point below the surface of earth equal to half the radius of earth, R, to a height R above the earths surface, then work done on it will be

The dimensional formula for speed is

According to kinetic theory of gases, at absolute zero of temperature

A body is traveling in a circle at constant speed. It

Four wires whose lengths and diameter respectively are given below are made of the same material. Which of these will have the largest extension when same tension is applied?

A artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy E0. Its potential energy is

Electric generator works on the scientific principle

For which of the following process, the thermal conduction is maximum?

An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62°C, its efficiency is doubled. Temperature of the source is:

The period of a simple harmonic oscillator is 2 sec. The ratio of its maximum velocity and maximum acceleration is

At a certain temperature, hydrogen molecules have r.m.s. velocity of 3 km/s. what is the r.m.s velocity of the oxygen molecules at the same temperature?

If a hole is bored along the diameter of the earth and a stone is dropped into the hole

A number of small drops of mercury coalesce adiabatically to form a single drop. The temperature of drop

Theory of relativity was discovered by

A particle moves on a circular path with decreasing speed. Choose the correct statement.

An iron bar of length l m and cross section A m² is pulled by a force of F Newton from both ends so as to produce and elongation in meters. Which of the following statement statements is correct

A body of mass 10 kg is travelling with uniform speed of 5 m/s. Its kinetic energy is ?

Energy is not carried by

A solid cylinder of length 1 m and diameter of cross section y 100 cms is first placed with its axis vertical its then slowly inclined till its axis is horizontal. The loss in its potential energy if the mass of the cylinder is 10 kg is

Which of the following statements is correct for any thermodynamic system?

A solid cylinder of mass 20 kg, has length 1 metre and radius 0.5m. then its momentum of inertia in kg m² about its geometrical axis is

Four wires of identical lengths, diameters and material and stretched on a sonometer box. The ratio of their tension is 1 : 4 : 9 : 16. the ratio of their fundamental frequencies is

When the intermolecular distance increases due to tensile force, then

A body is moving along a circle with an increasing speed. It possesses?

The physical sciences deal with the study of:

Which of the following technology uses Newton’s second and third laws of motion

A body starts from rest and travels with an acceleration of 2 m/s². After t seconds its velocity is 10 m/s . Then t is

The ratio of the change in dimension at right angles to the applied force to the initial dimension is known as

Absorptive power of perfectly black body is

Longitudinal strain is possible in the case of

A body of mass 20 kg is initially at a height of 3 m above the ground. It is lifted to a height of 2 m from that position. Its increase in potential energy is

Who among the following first gave the experimental velocity of G?

Real gases show mark able deviation from that of ideal gas behavior at

If I, a and t are the moment of inertia, angular acceleration and torque respectively of a body rotating about any axis with angular velocity w, then

The frequency of the note produced by plucking a given string increases as

Absolute error of the measurement is

Water rises up to a height of 5 cm in a capillary tube of radius 2 mm. what is the radius of the radius of the capillary tube if the water rises up to a height of 10 cm in another capillary?

A car sometimes overturns while taking a turn. When it overturns, it is

A bucket full of hot water is kept in a room and it cools from 75°C to 70°C in t1 minutes from 70°C to 65°C in t2 minutes and from 65°C to 60°C in t3 minutes; then

A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are the path of the particle makes with the x-axis an angle of

Physical quantities are

The volume of a cube in m³ is equal to the surface area of the cube in m². The volume of the cube is

Atomicity of charge was discovered by

Electron volt is a unit of

The moment of inertia of a uniform semicircular disc of mass M and radius about a line perpendicular to the plane of the disc through the centre is

Out of the basic forces , gravitational force

The equation of wave traveling along string is y = 3 cos p (100t – x) in C.G.S. unit then wavelength is

At critical temperature, the surface tension of a liquid

The path followed by a projectile is called its?

The aeroplane works on the scientific principle

Physics is a

The dimensional formula for acceleration is

A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is

What would be the duration of the year if the distance between the earth and the sun gets doubled?

A body starts from rest and travels for t second with uniform acceleration of 2 m/s². If the displacement made by it is 16 m, the time of travel t is

The M.I. of uniform circular disc about a diameter is I. its M.I. about an axis perpendicular to its plane passing through a point on its rim will be

A body of mass 20 kg is initially at a height of 3 m above the ground . It is lifted to a height of 2 m from that position. Its increase in potential energy is
(a) 100 J
(b) 392 J
(c) 60 J
(d) -100 J

A small body attached at the end of an inextensible string completes a vertical circle, then its

For increasing the angular velocity of an object by 10%, the kinetic energy has to be increased by

For a gas, the r.m.s. speed at 800K is

Two wires A and B are of the same length. The diameters are in the ratio 1 : 2 and the Youngs modulus are in ratio 2 : 1. if they are pulled by the same force, then their elongations will be in ratio

A block of wood is placed on a surface. A force is applied parallel to the surface to move the body. The frictional force developed acts

The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio.

A 180 metre long train is moving due north at a speed of 25 m/s. A small bird is flying due south, a little above the train, with a speed of 5 m/s. The time taken by the bird to cross the train is

ML-1T -2 is the dimensional formula of

A body of mass 1 kg is attached to one end of a wire and rotated in horizontal circle of diameter 40 cm with a constant speed of 2 m/s. what is the area of cross-section of the wire if the stress developed in the wire is 5 × 106 N/m²?

The centripetal component of acceleration arises when?

Spring is pulled down by 2 cm. What is amplitude of motion?

A body travels along the circumference of a circle of radius 2 m with a linear velocity of 6 m/s . Then its angular velocity is

An observer is moving towards a stationary source of frequency 250 Hz with a velocity of 40 m/s. If the velocity of sound is 330 m/s, the apparent frequency heard by the observer will be

The mass of a body which is equal to the ratio of the force acting on a body to the acceleration produced in the body is

Which of the following is a possible final step in applying the scientific method

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