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A man observes a coin placed at the bottom of a beaker which contains two immiscible liquids of refractive indices 1.2 and 1.4 as shown in the figure. Find the depth of the coin below the surface, as observed from above.

A uniform string of length L and mass M is fixed at both ends while it is subject to a tension T. It can vibrate at frequencies (v) given by the formula where n= 1,2,3..........

Which of the following circular rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature diff. will conduct most heat ?

Angle of dip is 90^(@) at

Which plotis the adsorptionisobarforchemisorptionwherex istheamountof gasadsorbedon mass m (at constant pressure at temperature T ?

Recovering information from a carrier is known as

A pointergalvanometerwitha scaleof 30divisionshas aresistanceof 12Omegafullscaledeflectionis obtained fora currentof 3mA .Calculatethe currentsensitivityof thegalvanometer.Howwill youconvert thisgalvanometerintoavoltageof range0 to18 V ?

Where did they decide to reach to save themselves and the ship?

Which of the following represent correct order of conductivity in solids ?

Assertion: If a conductur is given charge then no excess inner charge appears Reason : Electric field inside conductor is zero

A 3310 Å photon liberates an electron from a material with energy 3 xx 10^(-19) J while another 5000 Å photon ejects an electron with energy 0.972 xx 10^(-19)J from the same material. Determine the value of Planck's constant and the threshold wavelength of the material.

Statement I : Common base amplifiers give voltage gain with phase change . Statement II : When reverse bias in P - N junction is increased , the width of depletion layer increases.

The magnitude of the vector product of two vectors is 4. The magnitude of their scalar product is 4sqrt3 . The angle between the two vectors is :

One enetimetre on the main scale of Vernier callipers is divided into ten equal parts. If 10 divisions of Vernier scale coincide with 8 small divisions of the main scale, the least count of the callipers is :

In the circuit shown in the figure. L is ideal inductor and E is ideal cell. Swictch S is Closed at t = 0, Then:

Resonance curve of a resonant circuit is graphical representation between

Hydrogen atom does not emit X-rays because:

State Ampere's circuital law and express it mathematically. Give the sign convention involved in the relation.

The ceiling of a long hall is 20 m high. What is the maximum horizontal distance that a ball thrown with a speed of 40 ms^(-1) can go without hitting the ceiling of the hall (g=10 ms^(-2))

Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands seperated by energy gap respectively equal to (Eg)_C,(Eg)_(Si)and (Eq)_(Ge).Which of the following statement is true

There is friction between the block A and B while ground is smooth. Magnitude of force F is increasing linearly with time, a_(1) and a_(2) are accelerations of block A and B. Which graph best represents acceleration a_(1) and a_(2) of block A and B respectively with time?

An air bubble in glass slab of refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness of the slab is,

The mensicus of a liquid contained in one of the limbs of a narrow U-tube is held in an electromagnetic with the mensicus in line with the field . The liquid is seen to rise . This indicates that the liquid is

A prism (mu=1.5) has the refractive angle of 30^@. The deviation of monochromatic ray incident normally on its one surface will be : (Given sin48^@36'=0.75)

In a semiconductor, the current flow is due to A) Electrons B) Holes C) Negatively charged ions D) Positively charged ions

Is there difference between magnetic lines of force and electric lines of force ? If your answer is yes. What is that difference ?

A truth, which is self-evident is a/an

In Young's double slit experiment the two slits are d distance apart. Interence pattern is observed on a screen at a distance D from the slits. A dark fringe is observed on the screen directly opposite to one of the slits. The wavelength is

If the mass of earth is eighty times the mass of a planet and diameter of the planet is one fourth that of earth, then acceleration due to gravity on the planet would be

Unpolarised light of intensity 32Wm^-2 passes through three polarizers such that transmission axes of the first and second polarizer makes and angle 30^@ with each other and the transmission axis of the last polarizer is crossed with that of the first. The intensity of final emerging light will be

A pencil of light rays falls on a plane mirror and forms a real image, so the incident rays are

Who is the writer of the letter?

In the figure, potential difference between A & Bis

In a transformer, number of turns in the primary are 140 and that in the secondary are 280. If current in primary is 4A then that in the secondary is

The energy of a photon of characteristic X-ray from a Cooling tubes comes from

In an A.C. circuit in 1 second current reduces to zero value 120 times. Hence the frequency of A.C. current is ...... Hz.

An air bubble at the bottom of a lake 16 m deep has avolumeof 1.10 cm^(3). If thetemperatureat the bottom is 5.5^(@) and at thetop is is 17.0^(@)C, whatis thevolumeof the bubblejustbefor it reachesthe surface ?

Fig shows a p-n junction diode. a. What does V_(B) denote ? b. Name the region AB.

In Young's Double slit experiment, first maxima is observed at a fixed point P on the screen. Now the screen is continuously moved away from the plane of slits. The ratio of intensity at point P to the intensity at point O (centre of the screen)