Physics-
General
Easy
Question
Find the acceleration of M shown in figure. Pulleys are light and frictionless and strings are light and inextensible. (M<5m)
- upwards
- downwards
- upwards
- downwards
The correct answer is: upwards
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Consider the Atwood machine as shown in the figure. The larger mass is stopped for a moment 2.0 s after the system is set into motion. Find the time elapsed before the string is tight again.
Consider the Atwood machine as shown in the figure. The larger mass is stopped for a moment 2.0 s after the system is set into motion. Find the time elapsed before the string is tight again.
physics-General
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The pulley shown in the diagram is frictionless. A cat of mass 1 kg moves up on the massless string so as to just lift a block of mass 2 kg. After some time, the cat stops moving with respect to the string. The magnitude of the change in the cat's acceleration is:
The pulley shown in the diagram is frictionless. A cat of mass 1 kg moves up on the massless string so as to just lift a block of mass 2 kg. After some time, the cat stops moving with respect to the string. The magnitude of the change in the cat's acceleration is:
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A triangular plate has two cavities, one square and one rectangular as shown in figure. The plate is heated.
A triangular plate has two cavities, one square and one rectangular as shown in figure. The plate is heated.
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Three rods of equal length are joined to form an equilateral triangle ABC.D is the midpoint of AB. The coefficient of linear expansion is a1 for AB, and a2 for AC and BC. If the distance DC remains constant for small changes in temperature:–
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A cylindrical vessel of 90 cm height is kept filled up to the brim. It has four holes 1, 2, 3, 4 which are respectively at heights of 20cm, 30 cm, 40 cm and 50 cm from the horizontal floor PQ. The water falling at the maximum horizontal distance from the vessel comes from
A cylindrical vessel of 90 cm height is kept filled up to the brim. It has four holes 1, 2, 3, 4 which are respectively at heights of 20cm, 30 cm, 40 cm and 50 cm from the horizontal floor PQ. The water falling at the maximum horizontal distance from the vessel comes from
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Two forces and act on a thin uniform elastic rod placed in space. Force acts at right end of the rod and acts exactly at centre of the rod as shown (both forces act parallel to length of the rod).
i) causes extension of rod while causes compression of rod.
ii) causes extension of rod and also causes extension of rod.
iii) causes extension of rod while does not change length of rod.
The correct order of True / False in above statements is
Two forces and act on a thin uniform elastic rod placed in space. Force acts at right end of the rod and acts exactly at centre of the rod as shown (both forces act parallel to length of the rod).
i) causes extension of rod while causes compression of rod.
ii) causes extension of rod and also causes extension of rod.
iii) causes extension of rod while does not change length of rod.
The correct order of True / False in above statements is
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A rod of length 1000 mm and co-efficient of linear expansion per degree is placed symmetrically between fixed walls separated by 1001 mm. The Young's modulus of the rod is 1011 N/. If the temperature is increased by , then the stress developed in therod is (in N/):
A rod of length 1000 mm and co-efficient of linear expansion per degree is placed symmetrically between fixed walls separated by 1001 mm. The Young's modulus of the rod is 1011 N/. If the temperature is increased by , then the stress developed in therod is (in N/):
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A long capillary tube of mass '' gm, radius 2mm and negligible thickness, is partially immersed in a liquid of surface tension 0.1 N/m. Take angle of contact zero and neglect buoyant force of liquid. The force required to hold the tube vertically, will be - (g = 10 m/)
A long capillary tube of mass '' gm, radius 2mm and negligible thickness, is partially immersed in a liquid of surface tension 0.1 N/m. Take angle of contact zero and neglect buoyant force of liquid. The force required to hold the tube vertically, will be - (g = 10 m/)
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A block of mass ‘M’ area of cross-section ‘A’ & length ‘’ is placed on smooth horizontal floor. A force ‘ F ’ is applied on the block as shown. If ‘y’ is young modulus of material, then total extension in the block will be:
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In determination of young modulus of elasticity of wire, a force is applied and extension is recorded. Initial length of wire is ‘1 m’. The curve between extension and stress is depicted then young modulus of wire will be:
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A space 2.5 cm wide between two large plane surfaces is filled with oil. Force required to drag a very thin plate of area 0.5 just midway the surfaces at a speed of 0.5 m/sec is 1N. The coefficient of viscosity in kg–sec/ is :
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Shape of the meniscus formed by two liquids when capillaries are dipped in them are shown. In I it is hemispherical where as in II it is flat. Pick correct statement regarding contact angles formed by the liquids in both situations
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A capillary of the shape as shown is dipped in a liquid. Contact angle between the liquid and the capillary is and effect of liquid inside the meniscus is to be neglected. T is surface tension of the liquid, r is radius of the meniscus, g is acceleration due to gravity and r is density of the liquid then height h in equilibrium is
A capillary of the shape as shown is dipped in a liquid. Contact angle between the liquid and the capillary is and effect of liquid inside the meniscus is to be neglected. T is surface tension of the liquid, r is radius of the meniscus, g is acceleration due to gravity and r is density of the liquid then height h in equilibrium is
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The figure shows a soap film in which a closed elastic thread is lying. The film inside the thread is pricked. Now the sliding wire is moved out so that the surface area increases. The radius of the circle formed by elastic thread will
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A steady stream of water falls straight down from a pipe as shown. Assume the flow is incompressible, then
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physics-General