When forces F1, F2, F3 are acting on a particle of mass m such that F2 and F2 are mutually perpendicular, then the particle remains stationary. If the force F1 is now removed, then the acceleration of the particle is:
Moment of inertia of a circular wire of mass M and radius R about its diameter is :
Why even Carnot engine cannot give 100% efficiency?
In a transformer, number of turns in the primary are 140 and that in the secondary are 280. If current in primary is 4 A, then that in the secondary is :
The time period of a charged particle undergoing a circular motion in a uniform magnetic field is independent of its
At what temperature is the rms velocity of a hydrogen molecule equal to that of an oxygen molecule at 47°C ?
The mass of a product liberated on anode in an electrochemical cell depends on?
Note: t is the time period for which the current is passed.
A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively :
A child swinging on a swing in sitting position, stands up, then what will be the time period of the swing?
At absolute zero, Si acts as:
Heat given to a body which raises its temperature by 1°C is
If a current is passed through a spring then the spring will :
Two identical particles move towards each other with velocity 2v and v respectively. The velocity of centre of mass is :
Wavelength of light used in an optical instrument are 
then ratio of their respective resolving powers (corresponding to 
) is:
If in the circuit, power dissipation is 150 W, then R is :
A charged particle q is placed at the centre O of cube of length L (ABCDEPGH). Another same .charge q is placed at a distance L from O. Then the electric flux through ABCD is :
If a spring has time period T, and is cut into n equal parts, then the time period of each part will be :
Energy required to move a body of mass m from an orbit of radius 2R to 3R is:
If an electron and a proton having same momenta enter perpendicularly to a magnetic field, then :
On moving a charge of 20 C by 2 cm, 2 J of work is done, then the political difference bwteen the points is:
A tuning fork arrangement (pair) produces 4 beats/s with one fork of frequency 288. cps. A little wax is placed on the unknown fork and it then produces 2 beats/s. The frequency of the unknown fork is :
Tube A has both ends open while tube B has one end closed, otherwise they are identical. The ratio Of fundamental frequency of tubes A and B is :
If 13.6 eV energy is required to ionize the hydrogen atom, then the energy required to remove an electron from n = 2 is :
If three positive real numbers a, b, c are in A.P such that abc =4, then minimum value of b is?
Three numbers are chosen at random without replacement from 1,2,3 ............10. The probability that minimum of chosen number is 4 and their maximum is 8.
The real value of 'a' for which sum of square of the roots of the equation
A Wire When connected to 220 V mains supply has power dissipation 
. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is 
.
If two mirrors are kept at 60 degree to each other, then the number of images formed by them is :
If in a circular coil A of Radius R, current i is following and in another coil B of radius 2R is current 2i is flowing, then the ratio of the magnetic fields 
If an ammeter is to be used in a place of a voltmeter, then we must connect with the ammeter a:
If suddnly the gravitational force of attraction between earth and a satellite revolving around it becomes zero, then satellaite will:
If a body looses half of its velocity on penetrating 3 cm in a wooden block, then how much will it penetrate more before coming to rest?
From a building two balls A and B are thrown such that A is thrown upwards and B is thrown downwards (both vertically).
A ball whoose Kinetic Energy is E, is projected at an angle of 45 degree to the horizontal. The kinetic energy of the ball at the highest point of its flight will be:
The minimum velocity (in ms-I) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is :
Initial angular velocity of a circular disc of mass M is 
. Then two small spheres of mass m are attached gently to two diametrically opposite points on the edge of the disc. What is the final angular velocity of the disc?
In a simple harmonic oscillator, at the mean position
The part of a transistor which is most heavily doped to produce large number of majority carriers is
The part of a transistor which is most heavily doped to produce large number of majority carriers is
The energy band gap is maximum in
If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should :
When temperature increases, the frequency of a tuning fork :
Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will :
The kinetic energy needed to project a body of mass m from the earth's surface (radius R) to infinity is :
An astronomical telescope has a large aperture to :
The power factor of an AC circuit having resistance R and inductance L (connected in series) and an angular velocity (r) is:
Length of a string tied to two rigid supports is 40 cm. Maximum length (wavelength in cm) of a stationary wave produced on it, is:
Which statement is incorrect?
Which of the following is more close to a black body?
If there are n capacitors in parallel connected to V volt source, then the energy stored is equal to
If there are n capacitors in parallel connected to V volt source, then the energy stored is equal to