﻿ NEET Physics Solved Question Paper 2015 | Previous Year Papers | Zigya

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## NEET Physics Solved Question Paper 2015

#### Multiple Choice Questions

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1.

If P and Q are two non-collinear unit vectors and if  then the value of (P - Q)(2P + Q) will be

• 1

• 2

• $\frac{1}{2}$

• $\frac{3}{2}$

2.

A gas bubble forms an explosion under water which oscillate with a period T ∝ paρbEc, where p is the static pressure, ρ is the density ofwater and E is the total energy of explosion. Then, the values of a, b and c will be

3.

If a particle moves a distance x at a speed v1 and comes back with speed v2 , then the average speed and average velocity during this round trip will respectively be

• 0, v1 + v2

• v1 + v2, 0

• v1 − v2

4.

On an electron in an atom both electric and gravitational forces are collinear we neglect gravitational force (FG) in comparision to electric force (FE ), because

• FE > FG

• FN > FE

• FE >> FG

• FN >> FG

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5.

A metal block of mass 1 kg is resting on a frictionless horizontal plane. It is struck by a jet releasing water at a rate of 1 m/s and at a speed of 4 m/s. Then, the initial acceleration of the block will be

• 2 m/s2

• 8 m/s2

• 1 m/s2

• 4 m/s2

6.

A body of mass 5 kg moves on a straight path as a function of time x = t3 − 12t. The force on the body at t = 5s will be

• 100 N

• 150 N

• 120 N

• 130 N

7.

The potential energy of a certain spring when stretched through a distance x is 20 J. The amoµnt of work that must be done on this spring to stretch it through an additional distance $\frac{\mathrm{x}}{2}$ will be

• 20 J

• 25 J

• 5 J

• 15 J

8.

A flywheel of moment of inertia 0.4 kg-m2 and radius 20 cm is free to rotate about a central axis. If a string is wrapped on its circumference and it is pulled with a force of 10 N, then the change in its angular velocity after 4 s will be

• 10 rad/s

• 20 rad/s

• 40 rad/s

• 5 rad/s

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9.

Three identical spheres of mass m each are placed at the corners of an equilateral triangle of side 1 m. Taking one of the corners as the origin, the position vector of centre of mass is

10.

The driver of a truck travelling with a velocity v suddenly notice a brick wall infront of him at a distance r. How the driver avoid himself by crashing into the wall ?

• By speeding up the truck

• By applying a brake

• By slowing down the truck

• By taking a circular turn

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