Physics Test 190

Result

Physics Test 190

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Weekly Quiz Competition

Question 1
4 / -1

The K.E. acquired by a mass m in travelling a certain distance d, starting form rest, under the action of a constant force is directly proportional to

A
m

B

C

D
independent of m

Solution
Question 2
4 / -1

A gymnast takes turns with her arms and legs stretched. When she pulls her arms and legs in

A
the angular velocity decreases

B
the moment of inertia decreases

C
the angular velocity stays constant

D
the angular momentum increases

Solution
Question 3
4 / -1

Suppose, the acceleration due to gravity at the Earth's surface is 10 m s^–2 and at the surface of Mars it is 4.0 m s^–2. A 60 kg passenger goes from the Earth to the Mars in a spaceship moving with a constant velocity. Neglect all other objects in the sky. Which part of figure best represents the weight (net gravitational force) of the passenger as a function of time?

A
A

B
B

C
C

D
D

Solution
Question 4
4 / -1

A metal rod of Young's modulus undergoes an elastic strain of 0.06%. The energy per unit volume stored in Jm^–3 is

A
3600

B
7200

C
10800

D
14400

Solution
Question 5
4 / -1

The lift of an air plane is based on

A
Torricelli's theorem

B
Bernoulli's theorem

C
Law of gravitation

D
conservation of linear momentum

Solution

Bernoulli’s theorem.
Question 6
4 / -1

Consider two identical iron spheres, one which lie on a thermally insulating plate, while the other hangs from an insulatory thread. Equal amount of heat is supplied to the two spheres, then

A
temperature of A will be greater than B

B
temperature of B will be greater than A

C
their temperature will be equal

D
can’t be predicted

Solution

Temperature of B will be higher because, due to expansion centre of mass B will come down same heat is supplied but in B, Potential energy is decreased therefore internal energy gain will be more.
Question 7
4 / -1

The volume of an ideal gas is 1 litre and its pressure is equal to 72 cm of mercury column. The volume of gas is made 900 cm3 by compressing it isothermally. The stress of the gas will be

A
8 cm of Hg

B
7 cm of Hg

C
6 cm of Hg

D
4 cm of Hg

Solution
Question 8
4 / -1

Consider a gas with density r and as the root mean square velocity of its molecules contained in a volume. If the system moves as whole with velocity v, then the pressure exerted by the gas is

A

B

C

D

Solution
Question 9
4 / -1

A uniform pole of length l = 2 L is laid on smooth horizontal table as shown in figure. The mass of pole is M and it is connected to a frictionless axis at O.A spring with force constant k is connected to the other end. The pole is displaced by a small angle 0 from equilibrium position and released such that it performs small oscillations. Then

A

B

C

D

Solution
Question 10
4 / -1

In a standing wave experiment, a 1.2 kg horizontal rope is fixed in place at its two ends (x = 0 and x = 2.0 m) and made to oscillate up and down in the fundamental mode, at frequency 5.0 Hz. At t = 0, the point at x = 1.0 m has zero displacement and is moving upward in the positive direction of y axis with a transverse velocity 3.14 m/s. Tension in the rope is

A
60 N

B
100 N

C
120 N

D
240 N

Solution