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General
Easy
Question
In the figure one fourth part of a uniform disc of radius R is shown. The distance of the centre of mass of this object from centre ‘O’ is:
The correct answer is:
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Physics-
In the figure shown a hole of radius 2 cm is made in a semicircular disc of radius 6
at a distance 8 cm from the centre C of the disc. The distance of the centre of mass of this system from point C is :
In the figure shown a hole of radius 2 cm is made in a semicircular disc of radius 6 at a distance 8 cm from the centre C of the disc. The distance of the centre of mass of this system from point C is :
Physics-General
physics-
From a uniform disc of radius R, an equilateral triangle of side 
is cut as shown. The new position of centre of mass is :
From a uniform disc of radius R, an equilateral triangle of side is cut as shown. The new position of centre of mass is :
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physics-
The dumbbell is placed on a frictionless horizontal table. Sphere A is attached to a frictionless pivot so that B can be made to rotate about A with constant angular velocity. If B makes one revolution in period P, the tension in the rod is
The dumbbell is placed on a frictionless horizontal table. Sphere A is attached to a frictionless pivot so that B can be made to rotate about A with constant angular velocity. If B makes one revolution in period P, the tension in the rod is
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physics-
A hollow vertical cylinder of radius R is rotated with angular velocity w about an axis through its center. What is the minimum coefficient of static friction necessary to keep the mass M suspended on the inside of the cylinder as it rotates?
A hollow vertical cylinder of radius R is rotated with angular velocity w about an axis through its center. What is the minimum coefficient of static friction necessary to keep the mass M suspended on the inside of the cylinder as it rotates?
physics-General
Physics-
At time t = 0, N1 nuclei of decay constant 
& N2 nuclei of decay constant 
are mixed . The decay rate of the mixture is :
At time t = 0, N1 nuclei of decay constant & N2 nuclei of decay constant are mixed . The decay rate of the mixture is :
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Physics-
In an 
-decay the Kinetic energy of particle is 48 MeV and Q-value of the reaction is 50 MeV. The mass number of the mother nucleus is: (Assume that daughter nucleus is in ground state)
In an -decay the Kinetic energy of particle is 48 MeV and Q-value of the reaction is 50 MeV. The mass number of the mother nucleus is: (Assume that daughter nucleus is in ground state)
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Physics-
The maximum speed of a car on a road–turn of radius 30 m, if the coefficient of friction between the types and the road is 0.4, will be:
The maximum speed of a car on a road–turn of radius 30 m, if the coefficient of friction between the types and the road is 0.4, will be:
Physics-General
Physics-
Out of the following, the only pair that does not have identical dimensions is:
Out of the following, the only pair that does not have identical dimensions is:
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Physics-
The unit of e.m.f. is:
The unit of e.m.f. is:
Physics-General
Physics-
Curie is a unit of:
Curie is a unit of:
Physics-General
Physics-
The dimensions of shear modulus are:
The dimensions of shear modulus are:
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Physics-
Which physical quantities have the same dimension:
Which physical quantities have the same dimension:
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Physics-
Dimensions of magnetic field intensity is:
Dimensions of magnetic field intensity is:
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Physics-
The potential energy of a harmonic oscillator of mass 2 kg in its mean position is 5J. If its total energy is 9J, and its amplitude is 0.01 m, its time period would be:
The potential energy of a harmonic oscillator of mass 2 kg in its mean position is 5J. If its total energy is 9J, and its amplitude is 0.01 m, its time period would be:
Physics-General
physics-
In the figure, the block of mass m, attached to the spring of stiffness k is in contact with the completely elastic wall, and the compression in the spring is 'e'. The spring is compressed further by 'e' by displacing the block towards left and is then released. If the collision between the block and the wall is completely elastic then the time period of oscillations of the block will be:
In the figure, the block of mass m, attached to the spring of stiffness k is in contact with the completely elastic wall, and the compression in the spring is 'e'. The spring is compressed further by 'e' by displacing the block towards left and is then released. If the collision between the block and the wall is completely elastic then the time period of oscillations of the block will be:
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