Kinematics Test

Result

Kinematics Test - 14

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Question 1
1 / -0

A

B

C

D

Solution
Question 2
1 / -0

In one dimensional motion, instantaneous speed v satisfies the condition, 0 ≤ v < v₀, when

A
The displacement in time T must always take non-negative values.

B
The displacement x in time T satisfies - v₀T < x < v₀T.

C
The acceleration is always a non-negative number.

D
The motion has no turning points.

Solution
Question 3
1 / -0

The velocity of a particle at an instant is 10 m s⁻¹. After 3 s its velocity will becomes 16 m s⁻¹ . The velocity at 2 s, before the given instant will be

A
6 m s⁻¹

B
4 m s⁻¹

C
2 m s⁻¹

D
1 m s⁻¹

Solution

Applying first equation of motion from B to C.

v = u + at

16 = 10 + a(3) ⟹ a = 2m/s2

Now, applying first equation of motion from A to B.,

v = u + at

⟹ 10 = v + 2 × 2

⟹ v = 6m/s
Question 4
1 / -0

A

B

C

D

Solution
Question 5
1 / -0

A
(t₁+ t₂) / 2

B

C
(t₁t₂) / (t₂+ t₁)

D
t₁-t₂

Solution
Question 6
1 / -0

A
√3 : √2 : 1

B
3 : 2 : 1

C
9 : 4 : 1

D
1 : (√2 - 1) : (√3 - √2)

Solution
Question 7
1 / -0

A man throws balls with the same speed vertically upwards one after the other at an interval of 2 s. What should be the speed of the throw, so that more than two balls are in the sky at any time? (Given, g = 9.8 ms^-2)

A
Any speed less than 19.6 ms-¹

B
Only with speed 19.6 ms-¹

C
More than 19.6 ms-¹

D
At least 9.8 ms-¹

Solution
Question 8
1 / -0

A
1

B
2

C
10/7

D
20/7

Solution
Question 9
1 / -0

A ball is dropped into a well in which the water level is at a depth h below the top. If the speed of sound is c then the time after which the splash is heard will be given by

A

B

C

D

Solution
Question 10
1 / -0

When a ball is thrown up vertically with velocity V_o, it reaches a maximum height of h. If one wishes to triple the maximum height, then the ball should be thrown with velocity

A
√3 V₀

B
3 V₀

C
9 V₀

D
3/2 V₀

Solution