End Test Now

Which phenomenon explains the shifting of galaxies from each other?

Red shift

white dwarf

Black hole

Neutron star

Sound waves in air are always longitudinal because

the density of air is very small

this is an inherent characteristics of sound waves in all media

air does not have modulus of rigidity

air is a mixture of several gases

The equation of progressive wave is given by Which one of the following is correct?

v = 5 cm/sec

A = 0.04 cm

f = 50 Hz

The acceleration due to gravity g and the mean density of earth are related by relation

none of these

The escape velocity of a particle does not depend upon

mass of projectile

radius of earth

g

Which of the quantities can be written in SI units as kg-?

resistance

inductance

capacitance

magnetic flux

A man can throw a ball to a maximum height h. He can throw the same ball to a maximum horizontal distance of

A mass m with velocity u strikes to a wall normally and returns with the same speed. What is the change in momentum of the body when it returns?

- mu

mu

2 mu

zero

A solid sphere, disc and solid cylinder all of same mass and made up of same material are allowed to roll down (from rest) on an inclined plane, then

solid sphere reaches the bottom late

solid sphere reaches the bottom first

disc will reach the bottom first

all will reach the bottom at the same time

torque

gravitational constant

permittivity

surface tension

The absolute zero temperature in Fahrenheit scale is

Balmer series is found in which of the following region?

Ultra violet

Infrared

Invisible region

visible region

Unidirectional property of p-n junction diode is used in

rectifier

amplifier

transistor

oscillator

The gate shown is

NAND

NOR

AND

OR

Which one of the following is related with Wienâ€™s displacement law?

An LRC circuit consists of R = 25 and the reactance of C and L are and respectively. The impedance of circuit is

In an LCR circuit, impedance is minimum when

In a pure inductor circuit, the angle between potential and current is

The reason of various colours in soap bubble is

interference

visible light

diffraction

In Youngâ€™s double slit experiment the distance between the two slits is 0.1 mm and the wavelength of light used is m. If the width of the fringe on the screen is 4 mm. The distance between screen and slits is

0.1 mm

1 cm

0.1 cm

1 m

What is the relation between current in branch 1, 2 and 3?

no relation between them

The calories of heat developed in 200 watt heater in 7 minutes is estimate to be

15000

100

1000

200 W bulb work for 5 minutes, the energy consumed is

70,000 J

20,000 J

63,000 J

60, 000 J

Two infinitely long thin insulated straight wires lie in the x-y plane along the x and y axis respectively. Each wire carries current I respectively in the positive x direction and positive y direction. The magnetic field will be zero at all points on straight line

y = x

y = – x

y = x -1

y = -x +1

If two straight long conductors carry current in the same direction, the magnetic force on each other will be

repulsive

attractive

A charge q is divided into parts . The maximum coulomb repulsion between the two parts is obtained when the ratio of is

A proton is accelerated through a potential difference of 1V. Its kinetic energy is

1 eV

2 eV

4 eV

If current through resistor is 1.2 ampere then potential difference through resistor

9.6 V

2.6 V

2.4 V

7.2 V

Strain energy per unit volume in a stretched string is

stress X strain

none

A body is projected from earth surface to become its satellite, its time period of revolution will not depend upon

mass of earth

its own mass

gravitation

If force acts on a body whose line of action does not pass through its centre of gravity, then the body will experience

angular acceleration

linear acceleration

both (a) and (b)

If a neutron collides elastically with a stationary -particle with velocity v, what is resultant velocity of neutron?

In case of uniform circular motion, velocity and acceleration are

perpendicular

same direction

opposite direction

not related to each other

Which represents accelerated motion?

What is ?

Torque

Impulse

Momentum

Work

The ratio of the terminal velocities of two drops of radii R and R/2 is

2

1/4

1/2

4

If the frequency of oscillations of a particle doing SHM is n, the frequency of kinetic energy is

2n

n

n/2

A string is tied on a sonometer second end is hanging downward through a pulley with tension T. The velocity of the transverse wave produced is proportional to

If a carnotâ€™s engine functions at source temperature and at sink temperature what is its efficiency?

10 %

25 %

40 %

50 %

In the stable equilibrium position, a body has

maximum potential energy

minimum potential energy

minimum kinetic energy

neither maximum nor minimum potential energy

Moment of inertia of a body depends upon

axis of rotation

angular momentum

angular velocity

Keplerâ€™s law states that square of the time period of any planet around the sun is directly proportional to

Which one of the following is not thermodynamical function?

work done

Gibbâ€™s energy

Internal energy

Enthalpy

The function of base in transistor is

to stop the flow of electron

to stop the flow of I

to control the flow of I

to transmit I

A ray is incident in glass at on glass water boundary. If the angle of deviation of the ray is 4.5 degree, the angle of refraction in water will be

In a transformer there are two coils placed near one another. First has 100 turns and a current of 1A and the second coil has 25 turns. Current in the second coil will be

1 A

4 A

16 A

The electric field intensity on the axis of an electric dipole at a large distance r from the dipole is proportional to

In the circuit shown, the current in the resistor, if potential difference across XY is 50 volts will be

0.4 A

10 A

2 A

1.8 A

The dimensions of Planck constant is

Which one of the following can measure the position of a particle most accurately?

polarized light

light with high wavelength

light with low wavelength

If a particle is travelling with a speed of 0.9 of the speed of sound and is emitting radiations of frequency 1 kHz and moving towards the stationary observer, what is its apparent frequency?

1 kHz

0.8 kHz

0.4 kHz

10 kHz

Calculate the work done by one mole of an ideal gas if temperature is changed from at one atmosphere

100 calories

200 calories

400 calories

800 calories

Bohrâ€™s theory of hydrogen atom did not explain fully

diameter of H atom

emission spectra

ionization energy

the fine structure of spectral lines

A current loop placed in a non-uniform magnetic field experiences

a force of repulsion

a force of attraction

a torque but not force

a force and a torque

For a heavily doped n-type semi-conductor Fermi-level lies

a little below the conduction band

a little above the valence band

a little inside the valence band

at the centre of the band gap

A body of mass 2 kg makes an elastic collision with another body at rest and continues to move in the original direction with one fourth of its original speed. The mass of the second body which collides with the first body is

2 kg

1.2 kg

3 kg

1.5 kg or 1 kg

A research satellite of mass 200 kg circles the earth in an orbit of average radius 3R/2 where R is the radius of the earth. Assuming the gravitational pull on mass of 1 kg on the earthâ€™s surface to be 10 N, the pull on the satellite will be

880 N

889 N

885 N

892 N or 885 N

A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is

flat

concave

convex

cylindrical

A uniform plank of Youngâ€™s modulus Y is moved over a smooth horizontal surface by a constant horizontal force F. The area of cross-section of the plank is A. The compressive strain on the plank in the direction of the force is

Which of the following graphs best represents the variation of pressure (P) with volume (V) of a gas at a fixed temperature?

Two capacitors 10 and 25 are charged to a potential of 100 V each. Then they are connected in parallel. The potential across them are

50 V each

200 V each

100 V each

80 V and 120 V

In a LCR series circuit, at resonant frequency

The impedance and the current are maximum

The current and voltage are out of phase

The current is maximum

The current and voltage are maximum

In a compound microscope the intermediate image is

virtual, inverted and magnified

real, inverted and magnified

virtual, erect and magnified

virtual, erect and diminished

Parallel ray of green mercury light of wavelength 546 nm passes through a slit of width 0.4 mm covering a lens of focal length 40 cm. In the focal plane of the lens, the distance for the central maximum to the first minima is

0.546 mm

0.273 mm

1.092 mm

2.184 mm

Two bodies of equal masses revolve in circular orbits of radii with the same period. Their centripetal forces are in the ratio of

Which of the following position – time graphs represent uniform motion?

Angular momentum of a body is defined as the product of

mass and angular velocity

centripetal force and radius

linear velocity and angular velocity

moment of inertia and angular velocity

A bat flies at a steady speed of a emitting 90 kHz sound waves and is flying towards a wall. The beat frequency heard by the bat, in kHz is [speed of sound is 340 ]

3

5

In the given circuit voltage across resistance

0.4 V

0.6 V

0.8 V

1.0 V

If the unit of force and length are doubled, the unit of energy will be

1/4 times the original

1/2 times the original

4 times the original

8 times the original

Velocity-time (v-t) graph for a moving object is shown in the figure. Total displacement of the object during the time interval when there is non zero acceleration and retardation is

60 m

50 m

30 m

40 m

A simple pendulum is taken from the equator to the pole. Its period

decreases

increases

remains the same

becomes infinity

A cricket bat is cut at the location of its centre of mass as shown. Then

the two pieces will have the same mass

the bottom piece will have larger mass

the handle piece will have larger mass

canâ€™t say

Two long parallel wires P and Q are both perpendicular to the plane of the paper with distance 5 m between them. If P and Q carry current of 2.5 A and 5 A respectively in the same direction then the magnetic field at a point half way between the wires is

A body dropped from a height h with an initial speed zero reaches the ground with a velocity of 3 km/hour. Another body of the same mass was dropped from the same height h with an initial speed 4 km/hour, will reach the ground with a velocity of

3 km/hour

4 km/hour

5 km/hour

12 km/hour

A body whose mass is 50 kg stands on a spring balance inside a lift. The lift starts to ascend with an acceleration of 2 . The reading of the machine or balance is

50 kg

49 kg

60 kg

When the displacement is one-half of the amplitude in SHM the ratio of potential energy to the total mechanical energy is

Two circuits have mutual inductance of 0.1H. What average emf is induced in one circuit when the current in the other circuit changes from 0 to 20A in 0.02s?

240 V

230 V

100 V

300 V

A wire of length L meter carrying current i ampere is bent in the form of a circle. Magnetic moment of the wire is

Path of a particle moving under the influence of a force at some angle with direction of fixed in magnitude and direction towards a point is

straight line

circle

parabola

ellipse

A soap bubble oscillates with time period T, which in turn depends on the pressure (p) density () and surface tension (). Which of the following correctly represents the expression for T2?

The accuracy of a cesium clock is 1 part in . What can be the maximum difference between two such clocks operating for about 3200 years ?

partically no difference

2 second

1 minute

1 hour

A boat crosses the river in shortest possible route. The speed of the boat in still water is 13 . The average speed of the boat while crossing the river comes out to be 12 . What is the velocity of flow of river?

A particle is moving at 10 towards east. In one second its velocity changes to 10 towards north. If the particle be uniformly accelerated, the change in velocity will be directed at

Which of the following does not affect the maximum height attained by the projectile?

magnitude of initial velocity

acceleration of the projectile

angle of projection

mass of the projectile

With what minimum acceleration can a fireman slide down a rope whose breaking strength is 40% of his weight?

(1/5) g

(2/5)g

(3/5)g

(4/5)g

A block of mass m is placed on the top of another block of mass M as shown in the figure. The coefficient of friction between them is . What is the maximum acceleration with which the block M may move so that m also moves along with it?

A variable force acts on a particle of mass m (initially at rest) as shown in the F-t graph. Which of the following is correct?

the momentum gained is

momentum gained is infinite

momentum gained is zero

momentum gained is

A body starts from rest and acquires a velocity V in time T. The work done on the body in time t will be proportional to

A particle is moving along a circular path of radius 5m and with uniform speed . What will be the average acceleration when the particle completes half revolution

A block of mass M slides down on an inclined plane and reaches the bottom with velocity . Neglect friction. If a ring of same mass rolls down the same inclined plane, its velocity at the bottom will be

Angular momentum of a wheel changes from 2 L to 5 L in 3 seconds, then magnitude of torque acting on it is

L/5

L/3

L/2

L

A string of length l is fixed at one end and carries a mass M at the other end. The string makes revolution per second around the vertical axis through the fixed end as shown in the figure, the tension in the string is

16 Ml

4 Ml

2 Ml

Ml

Four identical rods are joined end to end to form a square. The mass of each rod is M. What is the moment of inertia of the square about the median line?

A solid sphere of radius is cut out of a solid sphere of radius R and mass M as shown in the figure. What is the gravitational acceleration at a point on the surface of sphere just above the point from where small sphere is cut out?

Two equal drops of water are falling through air with a steady velocity . If the drops coalesced, what will be the new velocity?

A beam of metal supported at the two ends, is loaded at the centre. Its depression is proportional to

On colliding in a closed container, the gas molecules

transfer momentum to the walls

momentum becomes zero

move in opposite directions

perform brownian motion

The temperatures of heat reservoirs in the ideal Carnot engine are and respectively. If increases by , what will be the efficiency of the engine?

62 %

59 %

95 %

100 %

Intensity level of a sound of intensity I is 30 dB. Then the ratio is ( is the threshold of hearing)

10,000

1,000

30

The ratio of velocity of sound in hydrogen and oxygen at STP is

16 : 1

8 : 1

4 : 1

2 : 1

Forty one tuning forks are arranged in increasing order of frequencies such that every fork gives 5 beats with the next. The last fork has a frequency that is double the frequency of the first fork. The frequency of first fork is

400

210

200

205

Three plates of area A each are connected as shown. The effective capacitance becomes

A charge +q is uniformly distributed over a thin ring of radius r. A particle of mass m and charge -q was initially at rest at infinity on the axis of the ring. Velocity of the particle all the moment it passes through the centre of the ring is given by

A charged ball B hangs from a silk thread S which makes an angle with a large charged conducting sheet P, as shown in the figure. The surface charge density of the sheet is proportional to

In the network shown in the figure each resistance is . The effective resistance between A and B is

A wire loop carrying current I is placed in the x-y plane. Magnetic inductance at P is

An inductor (L) -resistance® battery circuit is switched on at t = 0. If the emf of battery is E, the charge passing through the battery in time constant T is

Which of the radiations is responsible for heating the atmosphere due to green house effect?

Ultra-violet rays

Infra-red rays

micro waves

x-rays

A tower of height 20 m is observed through a telescope of magnifying power 8, then the tower appears to be

20 times taller

20 times nearer

8 times bigger

8 times nearer

For a prism of refractive index , the angle of the prism is equal to the angle of minimum deviation. The value of the angle of the prism is

4/3

1

64/27

27/64

Graph of maximum kinetic energy of the photo electrons against v, the frequency of the radiation incident on the metal, as a straight line of slope equal to

h

work function

stopping potential

h/e

If frequency of X-ray emitted from the element with atomic number 31 is , then the frequency of X-ray emitted from the element with atomic number 51 would be

The ratio of forward biased to reverse biased resistance for P-N junction diode is

A solid which is transparent to visible light and whose conductivity increases with temperature is formed by

metallic binding

ionic binding

convalent binding

van der waals binding

The aperture of objective lens of a telescope is made large so as to

focus on distant objects

make image aberration less

increase the resolving power of telescope

increase the magnifying power of the telescope

In an induction coil the emf induced in the secondary is maximum

at the break of the primary circuit

at the make of the primary circuit

neither at the make nor break of the primary circuit

either at the make or break of the primary circuit

Sound waves of wavelength greater than that of audible sound are called

ultrasonic waves

sonic waves

seismic waves

infrasonic waves

In which of the following cases the potential energy is defined?

both conservative and non conservative forces

conservative force only

non conservative fore only

neither conservative non conservative forces

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