Basic Science Test 20

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Basic Science Test 20

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Weekly Quiz Competition

Question 1
1 / -0

A torque of magnetude 200 Nm acting body produces an angular acceleration of 8 $$ rad / s ^{ 2} .$$ . The moment of inertia of the body is

A
$$ 25 kg - m ^{2} $$

B
$$ 12.5 kg - m ^{2}$$

C
$$ 50 kg - m ^{2}$$

D
$$ 75 kg - m ^{2} $$
Question 2
1 / -0

The relation between the time of flight a projectile $$ T_{f} $$ and the time to reach the maximum height $$ t_{m} $$ is

A
$$ T_{f} 2t_{m} $$

B
$$ T_{f} = t_{m} $$

C
$$ T_{f} = \dfrac{t_{m}}{2} $$

D
$$ T_{f} = \sqrt{2}(t_{m}) $$

E
$$ T_{f} = \dfrac{t_{m}}{\sqrt{2}} $$
Question 3
1 / -0

The displacement x and time t for a particle are related to each other as $$ t = \sqrt{x} + 3 $$ . What is work done in first six seconds of its motion ?

A
6 J

B
zero

C
4 J

D
2 J
Question 4
1 / -0

An electric motor uses 2 amperes of current when connected to a 12 volt battery to raise a 20 newton object vertically at constant velocity . If the energy conversion was 100 % efficient , the object be raised at a speed of

A
0.6 m/s

B
1.2 m/s

C
6 m/s

D
24 m/s
Question 5
1 / -0

If the force applied is F and the velocity galance is v , then the average power developed is :-

A
$$\dfrac{F}{v}$$

B
$$\dfrac{v}{F}$$

C
$$\dfrac{Fv}{2}$$

D
$$ Fv^{2} $$
Question 6
1 / -0

Two object A and B are moving with velocities $$ v_{A} and v_{B} $$ respectively a,long positive x - axis If $$ v_{A} < v_{B} $$ which of the following position time graph correctly showing the velocity of A and B ?

A

B

C

D
Question 7
1 / -0

A uniform thin bar of mass length 12 L is bent to make a regular hexagonal . Its moment of lines about an axis passing through the centre of mass and perpendicular to the plane of the hexagonal is -

A
20 $$ mL^{2}$$

B
6 $$ mL^{2}$$

C
$$\dfrac{12}{5} mL^{2}$$

D
30 $$ mL^{2}$$
Question 8
1 / -0

If change in displacement is proportional to time in the class of 1 - dimensional motin

A
velocity is varible

B
velocity is constant is magnitude only

C
velocity is constant in direction only

D
velocity is constant
Question 9
1 / -0

Three blocks of mass 2 kg. 3 kg andd 5kg are concted to each other with light strings and are then placed on a smooth frictional surface. The system i pulled with a force F from the side of the lighter mas so that it moves with an acceleration lighter mass so that it moves with an acceleration of $$1 ms ^{-2}$$ T_{1}$$, nd $$T_{2}$$ denote the tensions in the other strings The value of F is :

A
$$2N$$

B
$$3N$$

C
$$5 N$$

D
$$10 N$$
Question 10
1 / -0

The initial velocity of a particle is u (at t = 0 ) and the acceleration a is given by $$ at^{1/2}$$ Which of the following relation is valid ?

A
$$ v = un + at^{32} $$

B
$$ v = u + \dfrac{3 at^{3}}{2} $$

C
$$ v = u + \dfrac{2}{5} at^{1/2} $$

D
$$ v = u + at^{1/2} $$