Physics-
General
Easy
Question
A U-tube in which the cross-sectional area of the limb on the left is one quarter, the limb on the right contains mercury (density 13.6 g/cm3). The level of mercury in the narrow limb is at a distance of 36 cm from the upper end of the tube. What will be the rise in the level of mercury in the right limb if the left limb is filled to the top with water
- 1.2 cm
- 2.35 cm
- 0.56 cm
- 0.8 cm
The correct answer is: 0.56 cm
If the rise of level in the right limb be x cm. the fall of level of mercury in left limb be 4x cm because the area of cross section of right limb is 4 times as that of left limb.
Level of water in left limb is (36 + 4x) cm.
Now equating pressure at interface of Hg and water (at A' B')
By solving we get x = 0.56 cm.
Related Questions to study
Physics-
When a body falls in air, the resistance of air depends to a great extent on the shape of the body, 3 different shapes are given. Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same).
When a body falls in air, the resistance of air depends to a great extent on the shape of the body, 3 different shapes are given. Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same).
Physics-General
Maths-
5/6 can be represented in percentage as
5/6 can be represented in percentage as
Maths-General
Physics-
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 20 cm, 30 cm, 45 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 20 cm, 30 cm, 45 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-
A tank is filled with water up to a height H. Water is allowed to come out of a hole P in one of the walls at a depth D below the surface of water. Express the horizontal distance x in terms of H and D
A tank is filled with water up to a height H. Water is allowed to come out of a hole P in one of the walls at a depth D below the surface of water. Express the horizontal distance x in terms of H and D
Physics-General
Physics-
An L-shaped glass tube is just immersed in flowing water such that its opening is pointing against flowing water. If the speed of water current is v, then
An L-shaped glass tube is just immersed in flowing water such that its opening is pointing against flowing water. If the speed of water current is v, then
Physics-General
Physics-
A liquid flows through a horizontal tube. The velocities of the liquid in the two sections, which have areas of cross-section 
and 
, are 
and 
respectively. The difference in the levels of the liquid in the two vertical tubes is h
A liquid flows through a horizontal tube. The velocities of the liquid in the two sections, which have areas of cross-section and , are and respectively. The difference in the levels of the liquid in the two vertical tubes is h
Physics-General
Physics-
In this figure, an ideal liquid flows through the tube, which is of uniform cross-section. The liquid has velocities
and 
, and pressure PA and PB at points A and B respectively
In this figure, an ideal liquid flows through the tube, which is of uniform cross-section. The liquid has velocities and , and pressure PA and PB at points A and B respectively
Physics-General
Physics-
A liquid flows in a tube from left to right as shown in figure. and are the cross-sections of the portions of the tube as shown. Then the ratio of speeds 
will be
A liquid flows in a tube from left to right as shown in figure. and are the cross-sections of the portions of the tube as shown. Then the ratio of speeds will be
Physics-General
Physics-
A ball of radius r and density r falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water. If viscosity of water is h, the value of h is given by
A ball of radius r and density r falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water. If viscosity of water is h, the value of h is given by
Physics-General
Physics-
In the following fig. is shown the flow of liquid through a horizontal pipe. Three tubes A, B and C are connected to the pipe. The radii of the tubes A, B and C at the junction are respectively 2 cm, 1 cm and 2 cm. It can be said that the
In the following fig. is shown the flow of liquid through a horizontal pipe. Three tubes A, B and C are connected to the pipe. The radii of the tubes A, B and C at the junction are respectively 2 cm, 1 cm and 2 cm. It can be said that the
Physics-General
Physics-
An incompressible liquid flows through a horizontal tube as shown in the following fig. Then the velocity v of the fluid is
An incompressible liquid flows through a horizontal tube as shown in the following fig. Then the velocity v of the fluid is
Physics-General
Physics-
A candle of diameter d is floating on a liquid in a cylindrical container of diameter D (D>>d) as shown in figure. If it is burning at the rate of 2cm/hour then the top of the candle will
A candle of diameter d is floating on a liquid in a cylindrical container of diameter D (D>>d) as shown in figure. If it is burning at the rate of 2cm/hour then the top of the candle will
Physics-General
Chemistry-
In Haber s process, (he ammonia is manufactured according to the following reaction:
The pressure inside the chamber is maintained at 200 atm and temperature at 500°C Generally, this reaction is carried out in presence of Fe catalyst The preparation of ammonia by Haber's process is an exothennic reaction. If the preparation follows the following temperature pressure relationship. for its % yield. Then for temperature T1, T2 and T3 the correct option is: 
In Haber s process, (he ammonia is manufactured according to the following reaction: The pressure inside the chamber is maintained at 200 atm and temperature at 500°C Generally, this reaction is carried out in presence of Fe catalyst The preparation of ammonia by Haber's process is an exothennic reaction. If the preparation follows the following temperature pressure relationship. for its % yield. Then for temperature T1, T2 and T3 the correct option is:
Chemistry-General
Chemistry-
Using above equations, Write down expression for K of the following reaction:
Using above equations, Write down expression for K of the following reaction:
Chemistry-General
Physics-
P-V diagram of an ideal gas is as shown in figure. Work done by the gas in process ABCD is
P-V diagram of an ideal gas is as shown in figure. Work done by the gas in process ABCD is
Physics-General
