Kinematics (NEET Physics): Questions 63 - 67 of 229

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Question number: 63

» Kinematics » Motion in a Straight Line

MCQ▾

Question

A particle moves towards east with velocity 5 m/s. After 10 seconds its direction changes towards north with same velocity. The average acceleration of the particle is

Choices

Choice (4) Response

a.

12 m/s 2 S-W

b.

12 m/s 2 N-W

c.

zero

d.

12 m/s 2 N-E

Question number: 64

» Kinematics » Motion in a Straight Line

MCQ▾

Question

A 120 m long train is moving towards west with a speed of 10 m/s. A bird flying towards east with a speed of 5 m/s crosses the train. The time taken by the bird to cross the train will be

Choices

Choice (4) Response

a.

8 sec

b.

14 sec

c.

16 sec

d.

12 sec

Question number: 65

» Kinematics » Motion in a Straight Line

MCQ▾

Question

P, Q and R are three coplanar forces acting at a point and are in equilibrium. Given P = 1.9318 kg wt, sin Q = 0.9659, the value of R is (in kg wt)

Choices

Choice (4) Response

a.

2

b.

1

c.

0.9659

d.

0.5

Question number: 66

» Kinematics » Scalars and Vectors » Scalar and Vector Products

Assertion-Reason▾

Assertion (Ꭺ)

The sum of two vectors can be zero.

Reason (Ꭱ)

Two vectors cancel each other, when they are equal and opposite.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 67

» Kinematics » Scalars and Vectors » Scalar and Vector Products

MCQ▾

Question

What is the value of linear velocity, if co = 3i -4j + k and r = 5i - 6j + 6k

Choices

Choice (4) Response

a.

-18 i^ - 13 j^ + 2 k^

b.

6 i^ - 2 j^ + 8 k^

c.

4 i^ - 13 j^ + 6 k^

d.

6 i^ - 2 j^ + 3 k^

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