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NEET Physics Solved Question Paper 2014

Multiple Choice Questions

If the units of length, mass and force are chosen as fundamental units, the dimensions of time would be

[ M^1/2 L^-1/2 F^1/2 ]
[ M^1/2 L^1/2 F^1/2 ]
[ M^1/2 L^1/2 F^-1/2 ]
[ M^1/2 L^-1/2F^-1/2 ]

A block of mass 2 kg is placed on the floor. The coefficient of static friction is $0 \cdot 4$ . If a force of $2 \cdot 8$ N is applied on the block parallel to the floor, the force of friction between the block and the floor is (g = 10 ms^-2 )

$2 \cdot 8$ N
2 N
8 N
Zero

A heavy truck moving with a velocity of 60 km h^-1 collides with a light drum at rest. If the collision be elastic, then the velocity of the drum immediately after collision will be

zero
60 km h^-1
120 km h^-1
uncertain

A cyclist is moving in a circular track of radius 80 m with a velocity of 36 km h^-1. He has to lean from the vertical approximately through an angle (Take g = 10 m s^-2 )

tan^-¹ (4)
tan^-¹(1/8)
tan^-1(1/4)
tan^-1(2)

A satellite is in an orbit around the earth. If its kinetic energy is doubled, then

it will maintain its path
it will fall on the earth
it will rotate with a great speed
it will escape out of earth's gravitational field

A steel wire with cross-section 3 cm² has elastic limit 2.4 x 10⁸ N m^-2. The maximum upward acceleration that can be given to a 1200 kg elevator supported by this cable wire if the stress is not to exceed one-third of the elastic limit is (Take g = 10 ms^-2)

12 m s^-2
10 m s^-2
8 m s^-2
7 m s^-2

7.
An arrow is projected into air. Its time of flight is 5 s and range 200 m. What is the maximum height reached by it? ( Take g= 10 ms^-2 )

31·25 m

24·5 m

18·25 m

46·75 m

31·25 m

Given:-

5 = $\frac{2 u sinθ}{g}$

⇒ $\frac{u sinθ}{g} = \frac{5}{2}$

Maximum height of a projectile

Maximum height = $\frac{u^{2} \sin^{2} θ}{2 g}$

= $\frac{g}{2} \times \frac{u^{2} \sin^{2} θ}{g^{2}}$

= $\frac{g}{2} \times {(\frac{5}{2})}^{2}$

= $\frac{10}{2} \times \frac{25}{4}$

Maximum height = 31.25 m

A particle moves in a circular path with decreasing speed. Choose the correct statement.

Angular momentum remains constant
Acceleration $\vec{α}$ is towards the centre
Particle moves in a spiral path with decreasing radius
The direction of angular momentum remains constant

A body of mass 2 kg is thrown up vertically with kinetic energy of 490 J. The height at which the kinetic energy of the body becomes half of its original value is

50 m
12.25 m
25 m
10 m

10.

Two homogeneous spheres A and B of masses m and 2m having radii 2a and a respectively are placed in touch. The distance of centre of mass from first sphere is