Neet XI

Length cannot be measured by

If C and R represent capacitance and resistance respectively, then the dimensions of RC are

_____ measurement is most precise.

As shown in figure the tension in the horizontal cord is 30 N. The weight W and tension in the string OA in Newton are

A motor boat covers a given distance in 6 hours moving downstream of a river. It covers the same distance in 10 hours moving upstream. How much time (in hours) it takes to cover the same distance in still water?

A drunkard is walking along a straight road. He takes 5 steps forward and 3 steps backward followed again by 5 steps forward and 3 steps backward and so on. Each step is one metre long and takes one second. There is a pit on the road 11 metre away from the starting point. The drunkard will fall into the pit after how much time?

The acceleration of a moving body can be found from

A boat is moving with velocity of 3î+4ĵ in river and water is moving with a velocity of -3î-4ĵ with respect to ground. Relative velocity of boat with respect to water is

P, Q and R are three balloons ascending with velocities U, 4U and 8U respectively. If stones of the same mass be dropped from each, when they are at the same height, then

A ball is projected upwards from a height h above the surface of the earth with velocity v. The time at which the ball strikes the ground is

Motion of particle is given by equation s = (3t³ + 7t² + 14t +8)m.The value of acceleration of the particle at t =1 secis

An object is moving in a circle of radius 100 m with a constant speed of 31.4 m/s. What is its average speed for one complete revolution?

A block of mass m at the end of a string is whirled round in a vertical circle of radius R. The critical speed of the block at the top of its swing below which the string would slacken before the block reaches the top is

A body rolls down a stair case of 5 steps. Each step has height 0.1 m and width 0.1 m. With _____ velocity will the body reach the bottom.

The height y and the distance x along the horizontal plane of a projectile on a certain planet (with no surrounding atmosphere) are given by y= (8t - 5$t^2$) meter and x = 6t meter, where t is in second, the angle with the horizontal at which the projectile was projected is

A car is travelling with linear velocity v on a circular road of radius r. If it is increasing its speed at the rate of 'a' m /$s^2$ , then the resultant acceleration will be

Statement 1 : A coin is placed on phonogram turn table. The motor is started, coin moves along the moving table. Statement 2 : The rotating table is providing necessary centripetal force to the coin.

A particle is moving such that its position coordinates (x, y) are (2m,3 m) at time t = 0 ,(6 m,7 m) at time t = 2s and (13 m,14 m) at time t=5s . Average velocity vector $(V_av) from t =0 to t =5 sis

A plumb line is suspended from a ceiling of a car moving with horizontal acceleration of a. What will be the angle of inclination with vertical?

A body floats in a liquid contained in a beaker. If the whole system as shown in figure falls freely under gravity, then the upthrust on the body due to liquid is

An aircraft is moving with a velocity of 30ms⁻¹. If all the forces acting on it are balanced, then

Two forces are such that the sum of their magnitudes is 18 N and their resultant is perpendicular to the smaller force and magnitude of resultant is 12 N. Then the magnitudes of the forces are

A block of mass 4 kg is suspended through two light spring balances A and B. Then A and B will read respectively

The engine of a jet aircraft applies a thrust force of 10⁵ N during takeoff and causes the plane to attain a velocity of 1 km/s in 10 s. The mass of the plane is

Statement 1: The passengers sitting in a bus fall backward, when the bus suddenly starts moving. Statement 2: It is due to inertia of rest

The force F acting ona particle of mass m is indicated by the force-time graph as shown. The change in momentum of the particle over the time interval from zero to 8 s is Add figure

Which among the following, is a form of energy?

An object of 1 kg mass has a momentum of 10 kg m/s, then the kinetic energy of the object will be

A body of mass m moving with velocity v makes a head-on collision with another body of mass 2 m, which is initially at rest. The loss of kinetic energy of the colliding body (mass m) is

In a completely inelastic collision, the two colliding particles

The displacement x of a particle moving in one dimension under the action of a constant force is related to the time t by the equation t = $\sqrt{x}$+3, , where x is in meters and t is in seconds. The work done by the force in the first 6 seconds is

A lorry and a car moving with the same K.E. are brought to rest by applying the same retarding force, then

Statement 1: Work done by or against force of friction in moving body through any round trip is zero. Statement 2: This is because friction is conservative force.

Statement 1 : If two protons are brought near one another, the potential energy of the system will increase. Statement 2 : The charge on the proton is +1.6 x 10⁻¹⁹ C.

A body, constrained to move in y-direction, is subjected to a force given by F = (-2î+15ĵ +6k̂)N. The work done by this force in moving the body through a distance of 10 ĵm along y-axis, is