Physics-
General
Easy
Question
on relative change of momentum with respect to surface. Let any instant the velocity of surface is u, then above equation becomes – 
Based on above concept, in the below given figure, if the cart is frictionless and free to move in horizontal direction, then answer the following :
Given cross-section area of jet 
velocity of jet 
., density of liquid 
of cart 
. Initially 
the force on the cart is equal to :
- 20 N
- 40 N
- 80 N
- zero
The correct answer is: 40 N
Related Questions to study
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A cylindrical vessel of 90 cm height is kept filled upto 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 upto 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
Physics-General
Physics-
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
Physics-General
Physics-
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 
. If the temperature is increased by 
, then the stress developed in therod is (in 
):
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 . If the temperature is increased by , then the stress developed in therod is (in ):
Physics-General
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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 
)
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 )
Physics-General
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Assuming the xylem tissues through which water rises from root to the branches in a tree to be of uniform cross-section find the maximum radius of xylum tube in a 10 m high coconut tree so that water can rise to the top. (surface tension of water = 0.1N/m, Angle of contact of water with xylem tube= 
)
Assuming the xylem tissues through which water rises from root to the branches in a tree to be of uniform cross-section find the maximum radius of xylum tube in a 10 m high coconut tree so that water can rise to the top. (surface tension of water = 0.1N/m, Angle of contact of water with xylem tube= )
Physics-General
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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:
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:
Physics-General
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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:
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:
Physics-General
Physics-
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 :
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 :
Physics-General
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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
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
Physics-General
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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 
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 is density of the liquid then height h in equilibrium is
Physics-General
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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
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
Physics-General
Physics-
A steady stream of water falls straight down from a pipe as shown. Assume the flow is incompressible, then
A steady stream of water falls straight down from a pipe as shown. Assume the flow is incompressible, then
Physics-General
Physics-
A square box of water has a small hole located in one of the bottom corner. When the box is full and placed on a level surface, complete opening of the hole results in a flow of water with a speed 
, as shown in figure (A). When the box is still half empty, it is tilted by 
so that the hole is at the lowest point. Now the water will flow out with a speed of
A square box of water has a small hole located in one of the bottom corner. When the box is full and placed on a level surface, complete opening of the hole results in a flow of water with a speed , as shown in figure (A). When the box is still half empty, it is tilted by so that the hole is at the lowest point. Now the water will flow out with a speed of
Physics-General
Physics-
A non uniform cylinder of mass m, length and radius r is having its cetnre of mass at a distance 
/4 from the centre and lying on the axis of the cylinder. The cylinder is kept in a liquid of uniform density . The moment of inertia of the rod about the centre of mass is I. The angular acceleration of point A relative to point B just after the rod is released from the position shown in figure is
A non uniform cylinder of mass m, length and radius r is having its cetnre of mass at a distance /4 from the centre and lying on the axis of the cylinder. The cylinder is kept in a liquid of uniform density . The moment of inertia of the rod about the centre of mass is I. The angular acceleration of point A relative to point B just after the rod is released from the position shown in figure is
Physics-General
Physics-
The velocity of the liquid coming out of a small hole of a vessel containing two different liquids of densities 2 and as shown in figure is
The velocity of the liquid coming out of a small hole of a vessel containing two different liquids of densities 2 and as shown in figure is
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