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General
Easy
Question
A piece of Ice floats in a vessel with water above which a layer of lighter oil is poured. When ice melts :
1. The level of oil water interface falls
2. The level of oil water interface rises
3. The thickness of oil layer decreases
4. The thickness of oil layer remain same
5. The thickness of oil layer increases
6. The level of oil-air interface falls
7. The level of oil-air interface remains same
8. The level of oil-air interface rises Select the correct alternatives :
- only 4 & 7 are correct
- 2, 3 & 6 are correct
- 1 , 5 & 7 are correct
- Only 8 is correc
The correct answer is: 2, 3 & 6 are correct
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A container open from top, filled with water (density rw ) upto the top, is placed on a weighing machine and the reading is W. A wooden ball of volume V and mass m is put in the water by the given two arrangements. In arrangement–1, the ball is connected by a rigid rod (of negligible volume) and pushed in the water. In arrangement–2, the ball is attached with bottom by a massless string. The reading of weighing machine, (density of wood is less than water) (choose incorrect option) :
A container open from top, filled with water (density rw ) upto the top, is placed on a weighing machine and the reading is W. A wooden ball of volume V and mass m is put in the water by the given two arrangements. In arrangement–1, the ball is connected by a rigid rod (of negligible volume) and pushed in the water. In arrangement–2, the ball is attached with bottom by a massless string. The reading of weighing machine, (density of wood is less than water) (choose incorrect option) :
Physics-General
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Two forces F1 and F2act on a thin uniform elastic rod placed in space. Force F1 acts at right end of rod and F2acts exactly at centre of rod as shown (both forces act parallel to length of the rod).
i) F1 causes extension of rod while F2 causes compression of rod.
ii) F1 causes extension of rod and F2 also causes extension of rod.
iii) F1 causes extension of rod while F2 does not change total length of rod.
The correct order of True / False in above statements is
Two forces F1 and F2act on a thin uniform elastic rod placed in space. Force F1 acts at right end of rod and F2acts exactly at centre of rod as shown (both forces act parallel to length of the rod).
i) F1 causes extension of rod while F2 causes compression of rod.
ii) F1 causes extension of rod and F2 also causes extension of rod.
iii) F1 causes extension of rod while F2 does not change total length of rod.
The correct order of True / False in above statements is
Physics-General
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In the given figure, two elastic rods A & B are rigidly joined to end supports. A small block of mass ‘ m ‘ is moving with velocity v between the rods. All collisions are assumed to be elastic & the surface is given to be smooth. The time period of oscillations of small mass ‘ m ‘ will be: (A = area of cross section, Y = young’s modulus, L = length of each rod)
In the given figure, two elastic rods A & B are rigidly joined to end supports. A small block of mass ‘ m ‘ is moving with velocity v between the rods. All collisions are assumed to be elastic & the surface is given to be smooth. The time period of oscillations of small mass ‘ m ‘ will be: (A = area of cross section, Y = young’s modulus, L = length of each rod)
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Two particle of mass m each are fixed to a massless rod of length 2l . The rod is hinged at one end about a smooth hinge and it performs oscillations of small angle in vertical plane. The length of the equivalent simple pendulum is
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Physics-General
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A uniform disc of mass m is attached to a spring of spring constant k as shown in figure and there is sufficient friction to prevent slipping of disc. Time period of small oscillations of disc is:
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Physics-General
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A uniform thin hemispherical shell is kept at rest and in equilibrium on an inclined plane of angle of inclinationq = 30º as shown inf figure. If the surface of the inclined plane is sufficiently rough to prevent sliding then the angle a made by the plane of hemisphere with inclined plane is :
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Physics-General
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A block of dimensions l × t × h and uniform density rw rests on a rough floor. Wind blowing with speed V and of density ra falls perpendicularly on one face of dimension l × h of the block as shown in figure. Assuming that air is stopped when it strikes the wall and there is sufficient friction on the ground so that the block does not slide, the minimum speed V so that the block topples is :
A block of dimensions l × t × h and uniform density rw rests on a rough floor. Wind blowing with speed V and of density ra falls perpendicularly on one face of dimension l × h of the block as shown in figure. Assuming that air is stopped when it strikes the wall and there is sufficient friction on the ground so that the block does not slide, the minimum speed V so that the block topples is :
Physics-General
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Physics-General
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Physics-General
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A square loop of side ‘a’ is placed in x – y plane as shown in figure. In this region there is non-uniform time dependent magnetic field 
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Physics-General
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