Physics Test 153

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Physics Test 153

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Question 1
4 / -1

What is the mass of a body that accelerates at a rate of 2.6 m/s² with a force of 90 N?

A
44.6 kg

B
34.6 kg

C
54.6 kg

D
None of the mentioned

Solution

Newton's second law of motion relates force (F), mass (m), and acceleration (a) with the equation:

F = m ⋅ a

We can rearrange this equation to solve for mass (m):

m = F/a

In this case, the force (F) is given as 90 N, and the acceleration (a) is given as 2.6 m/s².

m = 90N / 2.6m/s²

Calculating this gives:

m ≈ 34.615kg

So, the closest answer is (b) 34.6 kg.
Question 2
4 / -1

In 5 seconds, an automobile speeds from 18 km/h to 36 km/h. What is the acceleration of the automobile in m/s?

A
0.5 m/s²

B
3 m/s²

C
1 m/s²

D
2 m/s²

Solution

The change in velocity (Δv) is the final velocity minus the initial velocity:

Δv = 36km/h − 18km/h = 18km/h

Convert Δv to m/s:

Δv = 18 × 1000 / 3600 m/s ≈ 5m/s

The change in time (Δt) is given as 5 seconds.

Now, use the formula for acceleration:

a = Δv/Δt = 5/5 m/s² = 1m/s²

So, the acceleration of the automobile is 1m/s², and the correct answer is (c) 1 m/s².
Question 3
4 / -1

On a flat surface, a block of wood is placed) To move the body, a force is provided parallel to the surface. The frictional force develops in the following directions:

A
normal to the surface upwards

B
normal to the surface downwards

C
along the applied force’s direction

D
opposite to the applied force’s direction

Solution

The frictional force develops in the direction opposite to the applied force's direction.

Therefore, the correct answer is: (d) opposite to the applied force's direction.
Question 4
4 / -1

Unless driven to act otherwise by an external force, every body remains in its condition of rest or uniform motion along a straight line. This is the

A
Inertia Law.

B
Newton’s first law

C
Both a and b

D
None of the above

Solution

The statement indeed represents both the Inertia Law and Newton's first law of motion, as they are essentially expressing the same principle. So, the correct answer is: (c) Both a and b.
Question 5
4 / -1

What are the components required to calculate the momentum of a body?

A
Mass and acceleration

B
Velocity and mass

C
Displacement and mass

D
None of the mentioned

Solution

The correct components required to calculate the momentum of a body are:

(b) Velocity and mass

The formula for momentum (p) is given by:

p = m ⋅ v

where:

m is the mass of the body,

v is the velocity of the body.

So, the correct answer is (b) Velocity and mass.
Question 6
4 / -1

For any arbitrary motion in space, which of the following relations is true?

A

B

C

D

Solution

The relation (b) is true, others are false because relations (a), (c) and (d) hold only for uniformly accelerated motion.
Question 7
4 / -1

The position of a particle is given by where t is in seconds and the coefficients have the proper units for to be in metres. The direction of velocity of the particle at t = 1 s is

A
53^o with x-axis

B
37^o with x-axis

C
30^o with y-axis

D
60^o with y-axis

Solution
Question 8
4 / -1

The acceleration of the particle at t =1 whose velocity is given by v=3ˆi+4tˆjms⁻¹i is

A

B

C

D

Solution
Question 9
4 / -1

Which is not the dimensions of frequency? (R = resistance, L = inductance, C = capacitance)

A
1/√LC

B
1/RC

C
C/L

D
R/L

Solution

The frequency of oscillations generated by the LC circuit entirely depends on the values of the capacitor and inductor and their resonance condition.

It can be expressed as:
Question 10
4 / -1

Which of the following is the dimension of power?

A

B

C

D

Solution