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 :

Anonymous User Physics 01 Mar, 2020 64 views

A child swinging on a swing in sitting position, stands up, then what will be the time period of the swing?

Anonymous User Physics 01 Mar, 2020 63 views

At absolute zero, Si acts as:

Anonymous User Physics Current Electricity 29 Feb, 2020 77 views

Heat given to a body which raises its temperature by 1°C is

Anonymous User Physics Thermodynamics 29 Feb, 2020 79 views

If a current is passed through a spring then the spring will :

Anonymous User Physics Current Electricity 29 Feb, 2020 59 views

Two identical particles move towards each other with velocity 2v and v respectively. The velocity of centre of mass is :

Anonymous User Physics 29 Feb, 2020 81 views

Wavelength of light used in an optical instrument are  then ratio of their respective resolving powers (corresponding to ) is:

Anonymous User Physics Waves and Sound Waves 29 Feb, 2020 63 views

If in the circuit, power dissipation is 150 W, then R is :

Anonymous User Physics Current Electricity 29 Feb, 2020 61 views

A charged particle q is placed at the centre 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 :

Anonymous User Physics Current Electricity 29 Feb, 2020 163 views

If a spring has time period T, and is cut into n equal parts, then the time period of each part will be :

Anonymous User Physics Laws of Motion and Friction 29 Feb, 2020 58 views

Energy required to move a body of mass m from an orbit of radius 2R to 3R is:

Anonymous User Physics Gravitation and Projectile 29 Feb, 2020 77 views

If an electron and a proton having same momenta enter perpendicularly to a magnetic field, then :

Anonymous User Physics Circular and Rotational Motion 29 Feb, 2020 59 views

On moving a charge of 20 C by 2 cm, 2 J of work is done, then the political difference bwteen the points is:

Anonymous User Physics Current Electricity 29 Feb, 2020 60 views

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 :

Anonymous User Physics Waves and Sound Waves 29 Feb, 2020 60 views

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 :

Anonymous User Physics Waves and Sound Waves 29 Feb, 2020 65 views

If 13.6 eV energy is required to ionize the hydrogen atom, then the energy required to remove an electron from n = 2 is :

Anonymous User Physics Current Electricity 29 Feb, 2020 61 views

If three positive real numbers a, b, c are in A.P such that abc =4, then minimum value of b is?

Anonymous User Maths Sequences and Series 29 Feb, 2020 66 views

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.

Anonymous User Maths Probability 29 Feb, 2020 66 views

The real value of 'a' for which sum of square of the roots of the equation

Anonymous User Maths Quadratic Equation 29 Feb, 2020 60 views

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 .

Anonymous User Physics Current Electricity 29 Feb, 2020 77 views

If two mirrors are kept at 60 degree to each other, then the number of images formed by them is :

Anonymous User Physics Ray Optics 29 Feb, 2020 83 views

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

Anonymous User Physics Current Electricity 29 Feb, 2020 65 views

If an ammeter is to be used in a place of a voltmeter, then we must connect with the ammeter a:

Anonymous User Physics Current Electricity 29 Feb, 2020 63 views

If suddnly the gravitational force of attraction between earth and a satellite revolving around it becomes zero, then satellaite will:

Anonymous User Physics Gravitation and Projectile 29 Feb, 2020 67 views

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?

Anonymous User Physics Gravitation and Projectile 29 Feb, 2020 70 views

From a building two balls A and B are thrown such that A is thrown upwards and B is thrown downwards (both vertically).

Anonymous User Physics Gravitation and Projectile 29 Feb, 2020 79 views

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:

Anonymous User Physics Kinematics 29 Feb, 2020 66 views

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 :

Anonymous User Physics 29 Feb, 2020 69 views

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?

Anonymous User Physics 29 Feb, 2020 105 views

In a simple harmonic oscillator, at the mean position

Anonymous User Physics Oscillation 29 Feb, 2020 62 views

The part of a transistor which is most heavily doped to produce large number of majority carriers is

Anonymous User Physics 29 Feb, 2020 64 views

The energy band gap is maximum in

Anonymous User Physics 29 Feb, 2020 63 views

If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should :

Anonymous User Physics 29 Feb, 2020 56 views

When temperature increases, the frequency of a tuning fork :

Anonymous User Physics 29 Feb, 2020 76 views

Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will :

Anonymous User Physics 29 Feb, 2020 70 views

The kinetic energy needed to project a body of mass m from the earth's surface (radius R) to infinity is :

Anonymous User Physics 29 Feb, 2020 56 views

An astronomical telescope has a large aperture to :

Anonymous User Physics 29 Feb, 2020 61 views

The power factor of an AC circuit having resistance R and inductance L (connected in series) and an angular velocity (r) is:

Anonymous User Physics Current Electricity 29 Feb, 2020 61 views

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:

Anonymous User Physics Waves and Sound Waves 29 Feb, 2020 81 views

Which statement is incorrect?

Anonymous User Physics Thermodynamics 29 Feb, 2020 54 views

Which of the following is more close to a black body?

Anonymous User Physics 29 Feb, 2020 68 views

If there are n capacitors in parallel connected to V volt source, then the energy stored is equal to

Anonymous User Physics Current Electricity 29 Feb, 2020 59 views

By increasing the temperature, the specific resistance of a conductor and a semiconductor

Anonymous User Physics Current Electricity 29 Feb, 2020 90 views

If No is the original mass of the substance of half-life period t1/2 = 5 years, then the amount of substance left after 15 years is:

Anonymous User Physics Work Power and Energy 29 Feb, 2020 95 views

Infrared radiations are detected by

Anonymous User Physics 29 Feb, 2020 60 views

Identify the pair whose dimensions are equal:

Anonymous User Physics Work Power and Energy 29 Feb, 2020 58 views

Which of the following are not electromagnetic waves?

Anonymous User Physics Waves and Sound Waves 29 Feb, 2020 61 views

The escape velocity of a body depends upon mass as

Anonymous User Physics 29 Feb, 2020 58 views