# AIIMS (All India Institute of Medical Sciences) Physics: Questions 411 - 415 of 500

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## Question number: 411

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### Question

The spring constant of a spring balance is . It is initially stretched by 5 cm from the unstretched position. Then the work done to stretch it further by another 10 cm is

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## Question number: 412

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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.

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27

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## Question number: 413

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### Question

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

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## Question number: 414

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### Question

A water drop of mass is introduced between two plates with separation Calculate the force of attraction between the plates.

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## Question number: 415

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### 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 –

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