A man of mass 60 kg hangs himself from a massless spring balance, which itself suspended from an ideal string-pulley system as shown in the

figure. The string AB can bear maximum 900 N. Choose correct statement.

A uniform solid hemisphere of radius 10 m and mass 64 kg is placed with its curved surface on the smooth horizontal surface and a string AB of length 4m is attached to point A on its rim as shown in the figure. Find the tension in the string if hemisphere is in equilibrium.

A uniform rod of mass M and length L is free to rotate about a frictionless pivot located L/3 from one end. The rod is released from rest incrementally away from being perfectly vertical, resulting in the rod rotating clockwise about the pivot. When the rod is horizontal, what is the magnitude of the tangential acceleration of its center of mass?

An object is being pushed at constant speed on an inclined plane. The free body diagram of the object is shown with the gravitational force represented by W, the friction force by f, the applied external push parallel to the incline by F, and the normal force with surface by N. Which one of the following choices represents correct relationships between the forces?

A string of mass m (can be non uniform as well) is suspended through two points which are not in same horizontal level. Tension in the string at the end points are T1 and T2 and at the lowest point is T3. Mass of string in terms of T1, T2 and T3 can be represented a {uniform gravity ‘g’ exists downwards)

All the blocks are attached to an ideal rope which passes over an ideal pulley. If accelerations of blocks m1, m2, m3, and m4 are a1, a2, a3 and a4 respectively then choose the correct option.

A massless spring of stiffness 400 N/m is fastened at left end to a vertical wall as shown in the figure I. Initially block C of mass 2 kg and block D of mass 5 kg rest on horizontal surface with block C in contact with spring (But not compressing it.) and the block D in contact with block C. Block C is moved leftward, compressing spring by a distance of 0.5 m and held in place while block D remains at rest as shown in the figure.

Now Block C is released block D. The surface is rough and the coefficient of friction between each block and surface is 0.1. The block collide instantaneously stick together and move right. Find the velocity of combined system just after collision.

The mean of the numbers a ,b ,8 ,5 ,10 is 6 and the variance is 6.80. Then which one of the following gives possible values of a and b?

The average marks of boys in class is 52 and that of girls is 42. The average marks of boys and girls combined is 50. The percentage of boys in the class is ?

Suppose a population A has 100 observations 101,102, ..., 200, and another population B has 100 observations 151, 152, ..., 250. If VA and VB represent the variances of the two populations, respectively 1then VA /VB is

Let x1, x2, ...., xn be n observations such that and .Then a possible value

of n among the following is

In a frequency distribution, the mean and median are 21 and 22 respectively, then its mode is approximately

In a series of 2n observations, half of them equal a and remaining half equal – a. If the standard deviation of the observations is 2, then |a| equals

Consider the following statements :

(1) Mode can be computed from histogram

(2) Median is not independent of change of scale

(3) Variance is independent of change of origin and scale.

Which of these is/are correct?

The median of a set of 9 distinct observations is 20.5. If each of the largest 4 observations of the set is increased by 2, then the median of the new set

In an experiment with 15 observations on x, the following results were available.

One observation that was 20 was found to be wrong and was replaced by the correct value 30. Then the corrected variance is

In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average of the girls?

Two spherical bodies of mass *M* and 5*M* and radii *R* and 2*R* respectively are released in free space with initial separation between their centres equal to 12*R*. If they attract each other due to gravitational force only, then what will be the distance covered by the smaller body just before the collision?

The time period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, what will be the new time period?

The escape velocity of a body depends upon mass as

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

What is the energy required to move a body of mass *m* from an orbit of radius *2R* to *3R? *

If suddenly the gravitational force of attraction between Earth and a satellite revolving around it becomes zero, then the satellite will

For the given uniform square lamina *ABCD*, whose centre is O,

Angular momentum of the particle rotating with a central force is constant due to

A round uniform body of radius *R*, mass *M* and moment of inertia *I* rolls down (without slipping) an inclined plane making an anglewith the horizontal. Then what will be its acceleration?

A circular disc of radius R is removed from a bigger circular disc of radius 2R such that the circumferences of the discs coincide. The centre of mass of the new disc is from the centre of the bigger disc. What is the value of ?

Four point masses, each of value *m*, are placed at the corners of a square *ABCD* of side *l*. What will be the moment of inertia of this system about an axis through *A* and parallel to *BD? *

A thin circular ring of mass *m* and radius *R* is rotating about its axis with a constant angular velocity Two objects each of mass *M* are attached gently to the opposite ends of a diameter of the ring. The ring now rotates with an angular velocity

A force ofacts on *O*, the origin of the coordinate system. What is the torque about the point (1, –1)?

Consider a two-particle system with particles having masses m_{1} and m_{2}. If the first particle is pushed towards the centre of mass through a distance *d*, by what distance should the second particle be moved, so as to keep the centre of mass at the same position?

A *T* shaped object with dimensions shown in the figure is lying on a smooth floor. A force *F* is applied at the point *P *parallel to *AB*, such that the object has only the translational motion without rotation. What is the location of *P* with respect to *C? *

A thin rod of length *L* is lying along the *x*-axis with its ends at *x* = 0 and *x* = *L*. Its linear density (mass/length) varies with *x* as *k*(*x*/L)^{n} where *n* can be zero or any positive number. If the position *x*_{CM} of the centre of mass of the rod is plotted against *n*, which of the following graphs best approximates the dependence of *x*_{CM} on *n*?

Consider a uniform square plate of side *a* and mass *m*. The moment of inertia of this plate about an axis perpendicular to its plane and passing through one of its corners is

The mean and the variance of a binomial distribution are 4 and 2 respectively. Then the probability of 2 successes is:

A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass the same which one of the following will not be affected?

Letbe the force acting on a particle having position vector andbe the torque of this force about the origin. Then

A particle performing uniform circular motion has angular momentum *L*. If its angular frequency is doubled and its kinetic energy halved, then what would be the new angular momentum?

A circular disc *X* of radius *R* is made from an iron plate of thickness *t*, and another disc *Y* of radius 4*R* is made from an iron plate of thickness *t/*4. Then what is the relation between the moment of inertia I_{x} and I_{y}?

A particle of mass *m* moves along line *PC* with the velocity *v* as shown in the below image.

What should be the angular momentum of the particle about *P*?

What is the moment of inertia of a circular wire of mass *M* and radius *R* about its diameter?

A solid sphere, a hollow sphere and a ring are released from top of an inclined plane (frictionless) so that they slide down the plane. Then what is the maximum acceleration down the plane is for (no rolling)?

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?

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?

What is the velocity of centre of mass if two identical particles move towards each other with velocity 2*v* and *v* respectively?

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

Why do we talk in our steep? Why we see unknown faces in the dream.

Why do we talk in our steep? Why we see unknown faces in the dream.

What are paracetamol and steroidal drugs and how a mystery and much work has to be done to join the links do they work?

What is PRIONS