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General
Easy
Question
Five identical parallel conducting plates each of area A have separation ‘d’ between successive surfaces. The plates are connected to the terminal of a battery as shown in the fig. The effective capacitance of the circuit is
The correct answer is:
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physics-
Some light bulbs are conected in parallel to a 120 V source as shown in the figure. Each bulb dissipates an average power of 60 W The circuit has a fuse F that burns out when the current in the circuit exceeds 9 A. Determine the largest number of bulbs of the following, that can be used in the circuit without burning out the fuse
Some light bulbs are conected in parallel to a 120 V source as shown in the figure. Each bulb dissipates an average power of 60 W The circuit has a fuse F that burns out when the current in the circuit exceeds 9 A. Determine the largest number of bulbs of the following, that can be used in the circuit without burning out the fuse
physics-General
physics-
In the circuit shown the variable resistance is so adjusted that the ammeter reading is same in both the position 1 and 2 of the key. The reading of ammeter is 2A. If E = 10 V, then x is
In the circuit shown the variable resistance is so adjusted that the ammeter reading is same in both the position 1 and 2 of the key. The reading of ammeter is 2A. If E = 10 V, then x is
physics-General
Physics-
Two identical blocks A and B are placed on two inclined planes as shown in diagram. Neglect air resistance and friction Read the following statements and choose the correct options
Statements I: Kinetic energy of ‘A’ on sliding to J will be greater than the kinetic energy of B on falling vertically to M. Statements II: Acceleration of ‘A’ will be greater than acceleration of ‘B’ when both are released to slide on inclined planes.
Statements III: Work done by external agent to move block slowly from position B to O is negative
Two identical blocks A and B are placed on two inclined planes as shown in diagram. Neglect air resistance and friction Read the following statements and choose the correct options
Statements I: Kinetic energy of ‘A’ on sliding to J will be greater than the kinetic energy of B on falling vertically to M. Statements II: Acceleration of ‘A’ will be greater than acceleration of ‘B’ when both are released to slide on inclined planes.
Statements III: Work done by external agent to move block slowly from position B to O is negative
Physics-General
physics-
In the system shown in the figure m1> m2. System is held at rest by thread BC. Just after the thread BC is burnt :
In the system shown in the figure m1> m2. System is held at rest by thread BC. Just after the thread BC is burnt :
physics-General
Physics-
The sphere at P is given a downward velocity v0 and swings in a vertical plane at the end of a rope of l = 1 m attached to a support at O. The rope breaks at angle 30° from horizontal, knowing that it can withstand a maximum tension equal to three times the weight of the sphere. Then the value of v0 will be: 
The sphere at P is given a downward velocity v0 and swings in a vertical plane at the end of a rope of l = 1 m attached to a support at O. The rope breaks at angle 30° from horizontal, knowing that it can withstand a maximum tension equal to three times the weight of the sphere. Then the value of v0 will be:
Physics-General
physics-
A particle is attached with a string of length l which is fixed at point O on an inclined plane what minimum velocity should be given (at the lowest point) to the particle along the incline so that it may complete a circle on inclined plane (plane is smooth and initially particle was resting on the inclined plane.)
A particle is attached with a string of length l which is fixed at point O on an inclined plane what minimum velocity should be given (at the lowest point) to the particle along the incline so that it may complete a circle on inclined plane (plane is smooth and initially particle was resting on the inclined plane.)
physics-General
physics-
The graph shows how the reciprocal of magnification 
produced by a converging thin lens varied with object distance u in displacement method. What was the focal length of the lens used?
The graph shows how the reciprocal of magnification produced by a converging thin lens varied with object distance u in displacement method. What was the focal length of the lens used?
physics-General
physics-
If the angular velocity of rotation of the disks is 
, then the angular velocity 
of rotation of a beam that is consecutively reflected n times from the mirrors is
If the angular velocity of rotation of the disks is , then the angular velocity of rotation of a beam that is consecutively reflected n times from the mirrors is
physics-General
physics-
A steel block of mass M is being lifted by a helicopter, which is accelerating upward with an acceleration of magnitude a. The block is attached to a horizontal bar by two cables, which make angles of 
and q2w.r.t. horizontal as shown in the figure. The tension in the cable 1 in terms of M, , 
, g and a is
A steel block of mass M is being lifted by a helicopter, which is accelerating upward with an acceleration of magnitude a. The block is attached to a horizontal bar by two cables, which make angles of and q2w.r.t. horizontal as shown in the figure. The tension in the cable 1 in terms of M, , , g and a is
physics-General
Physics-
Consider telecommunication through optical fibres Among the following statements one is not true
Consider telecommunication through optical fibres Among the following statements one is not true
Physics-General
Physics-
An AM wave is expressed as 
volts, the minimum and maximum values of modulated carrier wave are
An AM wave is expressed as volts, the minimum and maximum values of modulated carrier wave are
Physics-General
Physics-
The amplitude modulated current is given by 
The RMS value of carrier current will be
The amplitude modulated current is given by The RMS value of carrier current will be
Physics-General
physics-
A block of mass m = 2 kg is moving with velocity v0 towards a massless unstretched spring of force constant k = 10 N/m. Coefficient of friction between the block and the ground is 
= 1/5. Find the maximum value of v0 , so that after pressing the spring the block does not return back but stops there permanently.
A block of mass m = 2 kg is moving with velocity v0 towards a massless unstretched spring of force constant k = 10 N/m. Coefficient of friction between the block and the ground is = 1/5. Find the maximum value of v0 , so that after pressing the spring the block does not return back but stops there permanently.
physics-General
physics-
AB is an incident beam of light and CD is a reflected beam (the number of reflections for this may be 1 or more than 1) of light. AB & CD are separated by some distance. It is possible by placing what type of mirror on the right side
AB is an incident beam of light and CD is a reflected beam (the number of reflections for this may be 1 or more than 1) of light. AB & CD are separated by some distance. It is possible by placing what type of mirror on the right side
physics-General
Physics-
A small mass m slides from a point A of smooth quarter circular surface of mass M (free to move) as shown in figure. Mass M lies on smooth ground. When m reaches point B of M : (AB is one-fourth part of a circle of radius ‘r’) [Line OA is horizontal and OB is vertical]
A small mass m slides from a point A of smooth quarter circular surface of mass M (free to move) as shown in figure. Mass M lies on smooth ground. When m reaches point B of M : (AB is one-fourth part of a circle of radius ‘r’) [Line OA is horizontal and OB is vertical]
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