If 450 and v0 are the angle and velocity of projection respectively, then the time taken to attain the maximum height of the projectile is ……

• A) ${{{v_0}}}{{\sqrt 2 }}$
• B) $\frac{{{v_0}}}{{\sqrt 2 g}}$
• C) ${{{v_0}}}{{\sqrt 2 g}}$
• D) $\frac{{{v_0}}}{{\sqrt 2 }}$

The length of the radius vector at an apse is known as the apsidal

• A) acceleration
• B) distance
• C) velocity
• D) none of these

The orbit described under a central attractive force varying directly as the distance is --------- having the centre at the centre of the force.

• A) a circle
• B) a straight line
• C) none of these
• D) an ellipse

Areal speed of the radius vector r joining the particle to the centre of force is

• A) constant
• B) not constant
• C) none of these
• D) variable

The line joining an apse to the centre of force is -------- line

• A) a focal
• B) an apse
• C) none of these
• D) an initial

iN defining orbital velocity, thing whis is unimportant is --------.

• A) radius of Earth
• B) gravitational force
• C) mass of satellite
• D) mass of Earth

The central force is ---------- if it is directed away from the centre.

• A) attractive
• B) repulsive
• C) none of these
• D) not attractive

A force acting on a particle is said to be _______________ if its line of action always passes through a fixed point

• A) central force
• B) friction
• C) none of these
• D) applied force

Orbit of a particle moving under a central force is necessarily ____________

• A) a plane curve
• B) a space curve
• C) a straight line
• D) none of these

If 450 and 30 are the angle and velocity of projection respectively, then the time taken to attain the maximum height of the projectile is ……

• A) ${{{30}}}{{\sqrt 2 g}}$
• B) $\frac{{{30}}}{{\sqrt 2 g}}$
• C) ${{{30}}}{{\sqrt 2 }}$
• D) $\frac{{{30}}}{{\sqrt 2 }}$

If S is the system of particles which is in equilibrium, then the sum of all forces on the system S is-------.

• A) none of these
• B) zero
• C) very large
• D) undefined

If 150N of farce is applied on a spanner of 10 cm to open a nut then the length of spanner when the force applied on it is 60 N is----.

• A) 50cm
• B) 80cm
• C) 40cm
• D) 25cm

The rate of change of ------ of a particle about a point O is equal to the torque about O of the force on the particle.

• A) angular displacement
• B) angular velocity
• C) angular momentum
• D) none of these

In the following equation \[{(x - h)^2} = - 4a(y - k),\] the graph of parabola opens:

• A) Down
• B) Left
• C) Right
• D) Up

If a parabola is represented by \[{\left( {y - k} \right)^2} = - 4a\left( {x - h} \right),\] what is the direction of its opening?

• A) Rightward
• B) Upward
• C) Downward
• D) Leftward

If F is the central force, then the rate of change of angular momentum is -------.

• A) positive
• B) zero
• C) none of these
• D) negative

Direction of momentum is direction of object's-----.

• A) acceleration
• B) velocity
• C) mass
• D) frictional force

In the following equation \[{(x - h)^2} = 4a(y - k),\] the graph of parabola opens:

• A) Down
• B) Right
• C) Up
• D) Left

If a parabola is represented by {\left( {y - k} \right)^2} = - 4a\left( {x - h} \right), what is the direction of its opening?

• A) Rightward
• B) Leftward
• C) Upward
• D) Downward

In the following equation {(x - h)^2} = - 4a(y - k), the graph of parabola opens:

• A) Up
• B) Right
• C) Left
• D) Down