The word scientia is meaning to ___________.

(a)

exact

(b)

to know

(c)

control

(d)

implement

Which one of the following satatement is true?

(a)

A scalar quantity is conserved in a process

(b)

A scalar quantity does not vary from one point to another in apace

(c)

A scalar quantity can never take -ve values

(d)

A scalar quantity has only magnitude and no direction.

A ball is thrown vertically upward. It is a speed of 10 m/s. When it has reached one half of its maximum height. How high does the ball rise? (g = 10 ms^-2)

(a)

7 m

(b)

10 m

(c)

12 m

A rocket with a lift off mass 2.5 \(\times\) 10⁴ kg is blast upward with an initial acceleration of 5m/s². Then the initial thrust of the blast is ______________.

(a)

1.75 \(\times\)10⁵N

(b)

7 \(\times\)10⁵N

(c)

37.5\(\times\) 10⁵N

(d)

14 \(\times\)10⁵N

A body of mass 3 kg hits a wall at an angle of 60° and returns at the same angle. The impact time was 0.2 sec. The force exerted on the wall

(a)

150\(\sqrt { 3 } \) N

The velocity with which a gun suddenly moves backward after firing is ____________.

(a)

linear velocity

(b)

positive velocity

(c)

recoil velocity

(d)

v₁ + v₂

A particle with total energy E is moving in a potential energy region U(x). Motion of the particle is restricted to the region when ________________.

(a)

U(x) < E

(b)

U(x) = 0

(c)

U(x) \(\le\) E

(d)

U(x) > E

A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same, which one of the following will not be affected?

(a)

M.I

(b)

 Angular momentum

(c)

 Angular velocity

(d)

Rotational K.E.

Rotational kinetic energy can be calculated by using _____________.

(a)

\(\frac { 1 }{ 2 } \)Iω²

(b)

\(\frac { L^{ 2 } }{ 2I } \)

(c)

\(\frac { 1 }{ 2 } L\omega \)

(d)

all the above

Two spherical balls of mass 10hg are placed 10cm apart. Find gravitational force of attraction between them _______________.

(a)

the earth does not attract the objects in a satellite

(b)

the normal force by chair on the person balances the earth attraction

(c)

the normal force is zero

(d)

the person in sattelite is not accelerated