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Which phenomenon explains the shifting of galaxies from each other?
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
Which of the quantities can be written in SI units as kg-?
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?
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
The absolute zero temperature in Fahrenheit scale is
Balmer series is found in which of the following region?
Unidirectional property of p-n junction diode is used in
The gate shown is
Which one of the following is related with Wien’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
In Young’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
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
200 W bulb work for 5 minutes, the energy consumed is
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
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
If current through resistor is 1.2 ampere then potential difference through resistor
Strain energy per unit volume in a stretched string is
stress X strain
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
If force acts on a body whose line of action does not pass through its centre of gravity, then the body will experience
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
not related to each other
Which represents accelerated motion?
What is ?
The ratio of the terminal velocities of two drops of radii R and R/2 is
If the frequency of oscillations of a particle doing SHM is n, the frequency of kinetic energy is
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 carnot’s engine functions at source temperature and at sink temperature what is its efficiency?
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
Kepler’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?
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
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
The dimensions of Planck constant is
Which one of the following can measure the position of a particle most accurately?
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?
Calculate the work done by one mole of an ideal gas if temperature is changed from at one atmosphere
Bohr’s theory of hydrogen atom did not explain fully
diameter of H atom
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
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 earth’s surface to be 10 N, the pull on the satellite will be
892 N or 885 N
A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is
A uniform plank of Young’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
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 ]
In the given circuit voltage across resistance
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
A simple pendulum is taken from the equator to the pole. Its period
remains the same
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
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
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
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?
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
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
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?
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
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
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?
Intensity level of a sound of intensity I is 30 dB. Then the ratio is ( is the threshold of hearing)
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
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?
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
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
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
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
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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