Experimental Skills-Screw Gauge (NEET Physics): Questions 13 - 16 of 29

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Question number: 13

» Experimental Skills » Screw Gauge

MCQ▾

Question

Three identical metal balls each of radius r are placed touching each other on a horizontal surface such that an equilateral triangle is formed, when centers of three balls are joined. The center of the mass of system is located at

Choices

Choice (4) Response

a.

Line joining centers of any two balls

b.

Centre of one of the balls

c.

Horizontal surface

d.

Point of intersection of the medians

Question number: 14

» Experimental Skills » Screw Gauge

MCQ▾

Question

Four particles of masses m, 2m, 3m and 4m are arranged at the corners of a parallelogram with each side equal to a and one of the angle between two adjacent sides is 60°. The parallelogram lies in the x-y plane with mass-m at the origin and 4m on the x-axis. The center of mass of the arrangement will be located at

Choices

Choice (4) Response

a.

(a2,3a4)

b.

(0.95a,34,)

c.

(32a,0.95a)

d.

(3a4,a2)

Passage

Read the passage given below and answer the questions that follow:

A system consists of block A and B each of mass m connected by a light spring as shown in the figure with block B in contact with a wall. The block A compresses the spring by 3mg /k from natural length of spring and then released from rest. Neglect friction anywhere.

Block system with 2 blocks A and B

Block System With 2 Blocks a and B

In above figure we show that block A and B which connected with spring.

Question number: 15 (1 of 3 Based on Passage) Show Passage

» Experimental Skills » Screw Gauge

MCQ▾

Question

Acceleration of center of mass of system comprising A and B just after A is released is

Choices

Choice (4) Response

a.

3g

b.

0

c.

3g/2

d.

All of the above

Question number: 16

» Experimental Skills » Screw Gauge

Assertion-Reason▾

Assertion (Ꭺ)

The center of mass of a system of n particles is the weighted average of the position vector of the n particles making up the system.

Reason (Ꭱ)

The position of the center of mass of a system is independent of coordinate system.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

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

d.

Both Ꭺ and Ꭱ are false

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