Physics

NEET Class 12

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1.

Two particles of mass m_{1} and m_{2} approach each other due to their mutual gravitational attraction only. Then

accelerations of both the particles are equal

acceleration of the particle of mass m

_{1}is proportional to m_{1}acceleration of the particle of mass m

_{1}is proportional to m_{2}acceleration of the particle of mass m

_{1}is inversely proportional to m_{1}

2.

A satellite has kinetic energy K, potential energy V and total energy E. Which of the following statements is true ?

K = − V/2

K = V/2

E = K/2

E = − K/2

3.

A large number of particles are placed around the origin, each at a distance R from the origin. The distance of the centre of mass of the system from the origin is

equal to R

less than equal to R

greater than R

greater than equal to R

4.

Two particles A and B are moving as shown in the figure.

Their total angular momentum about the point O is

9.8 kg m

^{2}/ szero

52.7 kg m

^{2}/ s37.9 kg m

^{2}/ s

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5.

Particle A moves along X-axis with a uniform velocity of magnitude 10 m/s. Particle B moves with uniform velocity 20 m/s along a direction making an angle of 60° with the positive direction of X-axis as shown in the figure. The relative velocity of B with respect to that of A is

10 m/s along X-axis

$10\sqrt{3}$ m/s along Y-axis (perpendicular to X-axis)

$10\sqrt{5}$ m/s along the bisection of the velocities of A and B

30 m/s along negative X-axis

6.

Block B lying on a table weighs W. The coefficient of static friction between the block and the table is µ. Assume that the cord between B and the knot is horizontal. The maximum weight of the block A for which the system will be stationary is

$\frac{\mathrm{W}\mathrm{tan}\mathrm{\theta}}{\mathrm{\mu}}$

µW tan θ

$\mathrm{\mu W}\sqrt{1+{\mathrm{tan}}^{2}\mathrm{\theta}}$

µW sin θ

7.

Two particles A and B having different masses are projected from a tower with same speed. A is projected vertically upward and B vertically downward. On reaching the ground

velocity of A is greater than that of B

velocity of B is greater than that of A

both A and B attain the same velocity

the particle with the larger mass attains higher velocity

8.

A cylinder of height h is filled with water and is kept on a block of height h/2. The level of water in the cylinder is kept constant. Four holes numbered 1,2, 3 and 4 are at the side of the cylinder and at heights 0, h/4, h/2 and 3h/4, respectively. When all four holes are opened together, the hole from which water will reach farthest distance on the plane PQ is the hole number

1

2

3

4

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9.

A circular disc rolls on a horizontal floor without slipping and the centre of the disc moves with a uniform velocity v. Which of the following values of the velocity at a point on the rim of the disc can have ?

v

− v

2v

Zero

10.

Three bodies of the same material and having masses m, m and 3m are at temperatures 40°C, 50° C and 60° C, respectively. If the bodies are brought in thermal contact, the final temperature will be

45°C

54°C

52°C

48°C

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