Physics Mock Test-1

Dimensions [ML⁻¹T⁻¹] are related with

Wb/m² is equal to

10 mA current can pass through a galvanometer of resistance 25 ohms. What resistance in series should be connected through it so that it is converted into a voltmeter of 100V?

A current of 5 A is flowing at 220 V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2200 V and 50% of power is lost, then the current in the secondary will be

A photon of energy 10.2 eV collide inelastically with hydrogen atom in ground state after few microseconds another photon of energy 15 eV collides inelastically with same hydrogen atom. Finally by a suitable detector we find

24 cells of emf 1.5 V each having internal resistance of 1 ohm are connected to an external resistance of 1.5 ohms. To get maximum current,

A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and being short circuited through a resistance of 10Ω. Its internal resistance is

Excitation energy of a hydrogen like ion, in its first excitation state, is 40.8 eV. The energy needed to remove the electron from the ion in ground state is

During production of cathode ray

A copper disc of radius 0.1 m is rotated about its centre, with 10 revolutions per second, in a uniform magnetic field of 0.1 tesla with its plane perpendicular to the field. The e.m.f. induced across the radius of the disc is

A coil has an area of 0.05 m² and it has 800 turns. It is placed perpendicularly in a magnetic field of strength 4×10⁻⁵ Wb/m². It is rotated through 90⁰ in 0.1 sec. The average e.m.f. induced in the coil is

Out of the following options which one can be used to produce a propagating electromagnetic wave?

A change of 0.04 V takes place between the base and the emitter when an input signal is connected to the CE transistor amplifier. As a result, 20μA change take place in the base current and a change of 2mA takes place in the collector current. Find the input resistance and AC current gain.

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

A charge Q is uniformly distributed over a large plastic plate. The electric field at point P close to centre of plate is 10Vm⁻¹. If the plastic plate is replaced by copper plate of the same geometrical dimension and carrying the same charge Q, then the electric field at that point will be

4 point charges each +q is placed on the circumference of a circle of diameter 2d in such a way that they form a square. The potential at the centre is

A body of weight W newton is at the surface of the earth. Its weight at a height equal to half the radius of the earth will be

For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is

On the horizontal surface of a truck a block of mass 1 kg is placed (µ=0.6) and truck is moving with acceleration 5 ms⁻². The frictional force on block will be

A body of mass 2 kg is moved by a force F=3x where x is the distance covered. Initial position is x=2 m and the final position is x=10 m. The initial speed is zero. The final speed is

“On flowing current in a conducting wire the magnetic field is produced around it”. It is a law given by

In producing chlorine through electrolysis 100 watt power at 1125 V is being consumed. How much chlorine per minute is liberated? E.C.E. of chlorine is 0.367×10⁻⁶kg/coulomb

A thermocouple is made from two metals, antimony and bismuth. If one junction on the couple is kept hot and the other is kept cold then, an electric current will

The horizontal range of a projectile is 4√3 times the maximum height achieved by it. The angle of projection is

Find out the angle of projection, if range is 4 times of maximum height

Two balls are dropped from same height at 1 second interval of time. The seperation between the two balls after 3 second of the drop of the 1st ball is

A body is thrown upward from ground covers equal distances in 4th and 7th second. With what initial velocity the body was projected?

A small part of the rim of a flywheel breaks off while it is rotating at a constant angular speed. Then its radius of gyration will

If a gymnast, sitting on a rotating stool with his arms outstretched, suddenly lower his hands, then

A particle executing SHM with an amplitude of 0.1 m. At a certain instant, when its displacement is 0.02 m, its acceleration is 0.5 m/s². The maximum velocity of the particle is (in m/s)

A mass of 2.0 kg is put on a flat plan attached to a vertical spring fixed on the ground as shown in the figure. The mass of the spring and the pan is negligible. When pressed slightly and released the mass executes a simple harmonic motion. The spring constant is 200 N/m. What should be the minimum amplitude of the motion so that the mass gets detached from the pan (take g=10 m/s²)

If longitudinal strain for a wire is 0.03 and its poisson’s ratio is 0.5, then its lateral strain is

A student performs an experiment to determine the Young’s modulus of a wire, exactly 2 m long, by Searle’s method. In a particular reading, the student measures the extension in the length of the wire to be 0.8 mm with an uncertainty of ±0.05 mm at a load of exactly 1.0 kg. The student also measures the diameter of the wire to be 0.4 mm with an uncertainty of ±0.01 mm. Take g=9.8 m/s² (exact). The Young’s modulus obtained from the reading is

During mean life of a radioactive element, the fraction that disintegrates is

If 20% of a radiactive element decays in 10 days, then amount of original material left after 30 days is (approx)

If μᵥ=1.5230 and μʀ=15.145, then dispersive power of crown glass is

A glass slab consists of thin uniform layers of progressively decreasing refractive indices refractive index such that the refractive index of any layer is μ-m∆μ. Here μ and ∆μ denote the refractive index of 0th layer and the difference in refractive index between any two consecutive layers, respectively. The integer m=0,1,2,3,…… denotes the numbers of the successive layers. A ray of light from the 0th layer enters the 1st layer at an angle of incidence of 30⁰. After undergoing the mth refraction, the r

If ∆Q>0 when heat flows into a system, ∆W>0 when work is done on the system, then the increase in the internal energy ∆U is

If sink is at a temperature of -39⁰C and source at 0⁰C, then efficiency will be

The interferance pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio Imax-Imin/ Imax+Imin will be

A plane polarised light is incident normally on a tourmaline plate. Its E vector make an angle of 60⁰ with the optic axis of the plate. Find the percentage difference between initial and final intensities

The time of reverberation of a room A is one second. What will be the time (in seconds) of reverbation of a room, having all the dimensions double of those of room A?

A uniform rope of length 12 m and mass 6 kg hangs vertically from a rigid support. A block of masses 2 kg is attached to the free end of the rope. A transverst pulse of wavelength 0.06 m is produced at the lower end of the rope. What is the wavelength of the pulse when it reaches the top of the rope?

A stationary particle explodes into two particles of masses m₁ and m₂ which move in opposite directions with velocities v₁ and v₂. The ratio of their kinetic energy is

The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it is