Boost – Bansal Open Opportunity Scholarship Test
Physics Questions
1.) With what should a body be thrown upwards so that the distances traversed in 5th second and 6th second are equal?
a) 58.4 m/s
b) 49 m/s
c) √98 m/s
d) 98 m/s
2.) A system consists of mass M and m(<<M). The centre of mass of the system is :
a) at the middle
b) nearer to M
c) nearer to m
d) at the position of smaller mass.
3.) A ball is thrown vertically upwards in free space. Its total mechanical energy
a) Remains constant throughout the motion.
b) Increases during ascent and decreases during descent
c) Is zero at maximum height.
d) Is equal to kinetic energy at a point just below the maximum height.
4.) If a solid spherical ball rolls on a table without slipping, the fraction of its total energy associated with rotation is :
a) 3/5
b) 2/7
c) 2/5
d) 3/7
5.) The moment of inertia of a body does not depend on :
a) the mass of the body
b) the angular velocity of the body
c) the axis of rotation of the body
d) the distribution of the mass in the body.
6.) Adjoining figure shows two blocks A and B pushed against the wall with the force F. The wall is smooth but the surfaces in contact of A and B are rough. Which of the following is true for the system of blocks to be at rest against the wall?
FIGURE
a) F should be more than the weight of A and B
b) F should be equal to the weight of A and B
c) F should be less than the weight of A and B
d) System cannot be in equilibrium.
7.) A vector has a component of 10 m in the +x direction, a component of 10 m in the +y direction, and a component of 5 m in the +z direction. The magnitude of this vector is :
a) zero
b) 15 m
c) 20 m
d) 25 m
Ans : b) 15 m
8.) A number of bullets are fired in all possible directions with the same initial velocity u. The maximum area of the ground covered by bullets is
a) π(u²/g)²
b) π(u²/2g)²
c) π(u/g)²
d) π(u/2g)²
9.) The kinetic energy of a body is increased by 300%. The momentum of the body would increase by :
a) 50%
b) 100%
c) 150%
d) 300%
10.) A curved section of road is banked for a speed v. If there is no friction between road and tyres of the car, then :
a) car is more likely to slip at speeds (higher than v) as compared to speeds lower than v.
b) car cannot remain in static equilibrium on the curved section.
c) car will not slip when moving with speed v.
d) none of the above.