Physics Test 185

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Physics Test 185

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Weekly Quiz Competition

Question 1
4 / -1

The heart of a man pump s 5 litres of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be 13. × 10³kg/m³ and g=10m/s² then the power of heart in watt is

A
3.0

B
1.50

C
1.70

D
2.35

Solution
Question 2
4 / -1

On a frictionless surface, a block of mass M moving at speed v collides elastically with another block of same mass M which is initially at rest. After collision the first block moves at an angle 0 to its initial direction and has a speed v/3. The second block's speed after the collision

A
3/√2v

B
√3/2v

C
2√2/3v

D
3/4v

Solution
Question 3
4 / -1

Two particles of masses m₁,m₂ move with initial velocities u₁ and u₂.On collision, one of the particles get excited to higher level, after absorbing energy e. If final velocities of particles be v₁ and v₂ then we must have

A

B

C

D

Solution

final energy is in form of kinetic energy and potential energy ( excitation energy)
Question 4
4 / -1

A body of mass (4m) is lying in x-y plane at rest. It suddenly explodes into three pieces. Two pieces, each of mass (m) move perpendicular to each other with equal speeds (v). The total kinetic energy generated due to explosion is

A
mv²

B
3/2mv²

C
2mv²

D
4mv²

Solution
Question 5
4 / -1

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)

B
U(x) = 0

C
U(x) ≤ E

D
U(x) > E

Solution

As the particle is moving in a potential energy region.

∴ Kinetic energy > 0

And, total energy E = K.E. + P.E

⇒ U(x) < E
Question 6
4 / -1

The potential energy of a particle in a force field is

where A and B are positive constants and r is the distance of particle from the center of the field. For stable equilibrium, the distance of the particle is

A
B/2A

B
2A/B

C
A/B

D
B/A

Solution

So for stable equilibrium, the distance of the particle is = 2A/B
Question 7
4 / -1

Two spheres A and B of masses m₁ and m₂ respectively collide. A is at rest initially and B is moving with velocity v and along x-axis. After collision B has a velocity v/2 in a direction perpendicular to the original direction. The mass A moves after collision in the direction

A
same as that of B

B
opposite to that of B

C
θ = tan⁻¹(1/2) to the x-axis

D
θ = tan⁻¹(-1/2) to the x-axis

Solution
Question 8
4 / -1

The potential energy of a system increases if work is done

A
upon the system by a nonconservative force

B
by the system against a conservative force

C
by the system against a nonconservative force

D
upon the system by a conservative force

Solution

When work is done upon a system by a conservative force then its potential energy increases.
Question 9
4 / -1

A particle of mass m is released from rest and follows a parabolic path as shown. Assuming that the displacement of the mass from the origin is small, which graph correctly depicts the position of the particle as a function of time?

A

B

C

D

Solution

When the displacement of the mass from the origin is small, this

graph correctly depicts the position of the particle as a function of time.
Question 10
4 / -1

A mass m moving horizontally (along the x-axis) with velocity v collides and sticks to a mass of 3m moving vertically upward (along the y-axis) with velocity 2v. The final velocity of the combination is

A

B

C

D

Solution