Previous Year Questions
18 questions — organised by subject with solutions and explanations.
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In the circuit shown, the current in the 1Ω resistor is : [Main 2015]
The period of oscillation of a simple pendulum is Measured value of L is 20.0 cm known to 1 mm accuracy and time for 100 oscillations of the pendulum is found to be 90 s using wrist watch of 1s resolu
In the given circuit, charge on the 2μF capacitor changes as C is varied from 1μF to 3μF. as a function of ‘C’ is given properly by : (figures are drawn schematically and are not to scale)[Main 2015]
A train is moving on a straight track with speed . It is blowing its whistle at the frequency of 1000 Hz. The percentage change in the frequency heard by a person standing near the track as the train
A particle of mass m moving in the x direction with speed 2v is hit by another particle of mass 2m moving in the y direction with speed v. If the collision is perfectly inelastic, the percentage loss
Consider a spherical shell of radius R at temperature T.The black body radiation inside it can be considered as an ideal gas of photons with internal energy per unit volume and pressure . If the shell
A long cylindrical shell carries positive surface charge in the upper half and negative surface charge in the lower half. The electric field lines around the cylinder will look like figure given in: (
A uniformly charged solid sphere of radius R has potential (measured with respect to ) on its surface.For this sphere the equipotential surfaces with potentials and have radius and respectively[Main 2
Given in the figure are two blocks A and B of weight 20 N and 100 N respectively. These are being pressed against a wall by a force F as shown. If the coefficient of friction between the blocks is 0.1
A pendulum made of a uniform wire of cross sectional area A has time period T. When an additional mass M is added to its bob, the time period changes to . If the Young’s modulus of the material of the
For a simple pendulum, a graph is plotted between its kinetic energy (KE) and potential energy (PE) against its displacement d. Which one of the following represents these correctly? (Graphs are schem
Distance of the centre of mass of a solid uniform cone from its vertex is . If the radius of its base is R and its height is h then is equal to :[Main 2015]
Consider an ideal gas confined in an isolated closed chamber. As the gas undergoes an adiabatic expansion the average time of collision between molecules increases as , where V is the volume of the ga
When 5V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is .If the electron density in the wire is ,the resistivity of the material is close to[Main 2015]
From a solid sphere of mass M and radius R a cube of maximum possible volume is cut. Moment of inertia of cube about an axis passing through its center and perpendicular to one of its faces is :[Main
A solid body of constant heat capacity 1 J/°C is being heated by keeping it in contact with reservoirs in two ways:(i) Sequentially keeping in contact with 2 reservoirs such that each reservoir suppli
Two stones are thrown up simultaneously from the edge of a cliff 240 m high with initial speed of 10 m/s and 40 m/s respectively. Which of the following graph best represents the time variation of rel
From a solid sphere of mass M and radius R, a spherical portion of radius R/2 is removed, as shown in the figure. Taking gravitational potential V = 0 at , the potential at the centre of the cavity th