Physics

NEET Class 12

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1.

Two spheres of same size, one of mass 2 kg and another of mass 4 kg are dropped simultaneously from the top of Qutab Minar ( height ≈ 72 m ). When they are 1 m above the ground the two spheres have the same

momentum

kinetic energy

potential energy

acceleration

2.

The moment of inertia of a rod about an axis through its centre and perpendicular to it is $\frac{1}{12}$ ML^{2} ( where M is the mass and L, the length of the rod). The rod is bent in the middle so that the two halves make an angle of 60^{°}. The moment of inertia of the bent rod about the same axis would be

$\frac{1}{48}$ ML

^{2}$\frac{1}{12}$ML

^{2}$\frac{1}{24}$ ML

^{2}$\frac{{\mathrm{ML}}^{2}}{8\sqrt{3}}$

3.

The voltage of clouds is 4 x 10 volt with respect to ground. In a lightening strike lasting 100 msec, a charge of 4 coulombs is delivered to the ground. The power of the lightning strike is

160 MW

80 MW

20 MW

500 MW

4.

For inelastic collision between two spherical rigid bodies

the total kinetic energy is conserved

the total potential energy is conserved

the linear momentum is not conserved

the linear momentum is conserved

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5.

A person used force (F), shown in figure to move a load with constant velocity on surface. Identify the correct surface profile.

6.

**Assertion: ** A judo fighter in order to throw his opponent on to the mat tries to initially bend his opponent and then rotate him around his hip.

**Reason:** As the mass of the opponent is brought closer to the fighter's hip, the force required to throw the opponent is reduced.

If both assertion and reason are true and reason is the correct explanation of the assertion

If both assertion and reason are true but reason is not the correct explanation of the assertion

If assertion is true, but reason is false

Both assertion and reason are false statements

7.

**Assertion:** A man in a closed cabin which is falling freely does not experience gravity.

**Reason:** Inertial and gravitational mass have equivalence.

If both assertion and reason are true and reason is the correct explanation of the assertion

If both assertion and reason are true but reason is not the correct explanation of the assertion

If assertion is true, but reason is false

Both assertion and reason are false statements.

8.

A boat at anchor is rocked by waves whose crests are 100 m apart and velocity is 25 m/sec. The boat bounces up once in every

2500 s

75 s

4 s

0.25 s

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9.

By sucking through a straw, a student can reduce the pressure in his lungs to 750 mm of Hg ( densiy = 13.6 g/cm^{3}). Using the straw, he can drink water from a glass upto a maximum depth of

10 cm

75 cm

13.6 cm

1.36 cm

10.

A stone thrown into still water, creates a circular wave pattern moving radially outwards. Ifr is the distance measured from the centre of the pattern, the amplitude of the wave varies as

r

^{1/2}r

^{-1}r

^{2}r

^{3/2}

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Textbook Solutions | Additional Questions