Physics-
General
Easy
Question
Choose the wrong statement
- Appearance can often be deceptive
- You can always judge lengths by observation
- Estimations are valuable in case where accuracy is not needed
- Rough estimations are not accurate
The correct answer is: You can always judge lengths by observation
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Charge induced on the inner surface of cavity is
Charge induced on the inner surface of cavity is
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A positive point charge Q is kept (as shown in the figure) inside a neutral conducting shell whose centre is at C. An external uniform electric field E is applied. Then
A positive point charge Q is kept (as shown in the figure) inside a neutral conducting shell whose centre is at C. An external uniform electric field E is applied. Then
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A charge Q0 is placed at centre of spherical cavity of a conductor and another charge Q, is placed outside the conductor. The correct statement is:
A charge Q0 is placed at centre of spherical cavity of a conductor and another charge Q, is placed outside the conductor. The correct statement is:
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Four identical large metal plates are arranged parallel to each other, with equal gaps in between. They are given charges q, 2q, 3q and 4q (counting from any one side). The outermost plates are now shorted. The charge which flows through the shorting wire is
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Two concentric shells R and 2R charges qA and qB and potentials 2V and (3/2)V respectively. Now shell B is earthed and let charges 
Then
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The minimum time in which the girl can stop from 9 m/s relative speed, to zero relative speed, without causing her shoes to slip is
The minimum time in which the girl can stop from 9 m/s relative speed, to zero relative speed, without causing her shoes to slip is
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The ball B of mB = m is suspended from a light string of length L attached to cart A, of mass mA = m which can move freely on frictionless horizontal floor. If the ball is given an initial horizontal velocity V0 (as shown in figure). While cart is at rest. The maximum vertical distance H through which ball B will rise from initial level
The ball B of mB = m is suspended from a light string of length L attached to cart A, of mass mA = m which can move freely on frictionless horizontal floor. If the ball is given an initial horizontal velocity V0 (as shown in figure). While cart is at rest. The maximum vertical distance H through which ball B will rise from initial level
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A hollow, insulating spherical shell has a surface charge distribution placed upon it, such that the upper hemisphere has a uniform surface charge density 
, while the lower hemisphere has a uniform surface charge density 
, as shown in the figure. Their interface lies in x-y plane. Which of the following statement (s) is / are correct
A hollow, insulating spherical shell has a surface charge distribution placed upon it, such that the upper hemisphere has a uniform surface charge density , while the lower hemisphere has a uniform surface charge density , as shown in the figure. Their interface lies in x-y plane. Which of the following statement (s) is / are correct
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Using thomson’s model of the atom, consider an atom consisting of two electrons, each of charge –e, embeded in a sphere of charge + 2e and radius R. In equilibrium each electron is at distance d from the centre of the atom. What is equilibrium separation between electrons?
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Sand falls vertically at a rate of 50 kg/s from a stationary hopper on a horizontal conveyor belt moving at a speed of 1 m/s as shown in fig. If belt is perfectly inelastic, then what is the minimum power output of the engine which drives the belt with speed v = 1m/s
Sand falls vertically at a rate of 50 kg/s from a stationary hopper on a horizontal conveyor belt moving at a speed of 1 m/s as shown in fig. If belt is perfectly inelastic, then what is the minimum power output of the engine which drives the belt with speed v = 1m/s
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Two charges are placed near the origin: charge q1 = +3Q is placed at x = +d/ 2, and charge q2= –Q is placed at x = –d/2. Which of the following statement(s) is/are a valid description of the electric field arising from the two charges?
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A small ball of mass m is suspended from inextensible massless string of length L. At certain instant of time the velocity of point O is 
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A water molecule as shown is in a region of uniform electric field 
This molecule experiences
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The diagram shows a uniformly charged hemisphere of radius R. It has volume charge density 
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The diagram shows a uniformly charged hemisphere of radius R. It has volume charge density . If the electric field at a point 2R distance above its center is E then what is the electric field at the point which is 2R below its center?
physics-General
