AIIMS Physics: Questions 412 - 415 of 500

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Question number: 412

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A wire has length 1.5 m and radius 1.5 mm and another wire has length 4.5 m and radius 4.5 mm. Both are fixed at one end and twisted at other end. Calculate the ratio of couples required to twist the wires through the same angle. The wires are made of the same material.

Choices

Choice (4) Response
a.

19

b.

9

c.

27

d.

127

Question number: 413

» Communication System » Sky and Space Wave Propagation

MCQ▾

Question

For sky wave propagation of a 14 MHz signal, what should be the minimum electron density in ionosphere –

Choices

Choice (4) Response
a.

2.4×1012m3

b.

1014m3

c.

2.4×106m3

d.

1022m3

Question number: 414

» Properties of Solids & Liquids » Viscosity

MCQ▾

Question

A water drop of mass m=500mg is introduced between two plates with separation d=0.06mm. Calculate the force of attraction between the plates.

Choices

Choice (4) Response
a.

16.22N

b.

19.44N

c.

21.12N

d.

17.33N

Question number: 415

» Center of Mass » Centre of Mass of a Two-Particle System

MCQ▾

Question

Four particles of masses 2 kg, 2 kg, 4 kg and 4 kg are placed at the corners of a square of side 10 cm as shown in figure. So, the position vector of centre of mass of the system is –

Four particles placed at the corners of a square

Four Particles Placed at the Corners of a Square

In figure four particles of masses 2 kg, 2kg, 4 kg and 4kg are placed at the corners of a square of side 10 cm are shown.

Choices

Choice (4) Response
a.

(10i^+20j^)cm

b.

(10i^+203j^)cm

c.

(5i^+20j^)cm

d.

(5i^+203j^)cm

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