Hydraulic Lift and Brakes

Q.

A hydraulic lift has a large cross-section and a small cross-section. The large cross-sectional area is 20 times the small cross-sectional area. If on the small cross-section, an input force of 25 N is applied, then the output force is

1. 300 N

2. 200 N

3. 400 N

4. 500 N

Q.

In a hydraulic machine, the two pistons have an area of cross-section in the ratio 1:5, what force should be applied on the narrow piston to get an output of 50 N on the wider piston?

1. 20N

2. 15N

3. 5N

4. 10N

Q.

In a hydraulic lift, there is a piston at one end and a car of mass 400 kg balanced on the load side. If the cross sectional area of load side is 20 $m^2$ and that of the piston is 5 $m^2$, what is the force applied by the piston? [Take $g=10m{s}^{-2}$]

1. 1000 N

2. 1600 N

3. 4000 N

4. None of these

Q.

The area of the cross-section of press plunger of a hydraulic press is $4m^2$. It is required to overcome a resistive load of $400kgf$ on it. Calculate the force required on the pump plunger if the area of cross section of the pump plunger is $0.01m^2$

1. 1kgf

2. 10kgf

3. 0.1kgf

4. 100kgf

Q.

A hydraulic lift has two pistons, the larger cross-sectional area is 40 times the smaller cross-sectional area. If an input force of 25 N is applied on the smaller cross-section, then the output force is

1. 100 N

2. 1000 N

3. 2000 N

4. 1500 N

Q.

In a model hydraulic lift, a force of 1 N is exerted on one arm which moves it by 20 cm. By what distance does the other arm move if the force experienced at the other end is 10 N?

1. 0.2 cm

2. 20 cm

3. 200 cm

4. 2 cm

Q.

In the given figure, there are two pistons A and B. The area of the piston A($A_A$) is 50 $c{m}^2$ and area of the piston B($A_B$) is 4000 $c{m}^2$. Find the external input force $F$ required to lift the car of 16000 N.

1. 300 N

2. 400 N

3. 100 N

4. 200 N

Q.

Water flows through a horizontal tube of variable cross section. The area of cross section at A and B are 4 mm² and 2 mm² respectively. If 1 cc of water enters per second through A, find the speed of water at B?

1. 25 cm/s

2. 50 cm/s

3. 25 mm/s

4. 50 mm/s

Q.

The area of cross section of the wider tube shown in figure is 900 cm². If the boy standing on the piston weighs 45 kg, find the difference in the levels of water in the two tubes.

1. 5 cm

2. 0.50 cm

3. 50 m

4. 50 cm

Q.

The area of the cross-section of the wider tube shown in the figure is 900 cm². If the boy standing on the piston weighs 45 kg, find the difference in the levels of water in the two tubes. Density of water = $1000kg/m^3$

1. 5 cm

2. 0.50 cm

3. 50 m

4. 50 cm

Q. Which of the following are uses of hydraulic press?

1. Pressing cotton bales.
2. Extracting juice from sugarcane.
3. Squeezing oil.
4. Engraving monograms on goods.

Q. A force of $600N$ acts on the bullet of the area of cross section $0.6{cm}^2$. The pressure exerted is ${10}^x$. What is X?

Q. Harry says water exerts pressure on the bottom surface of the bucket as well as on the walls, but Robert says water exerts pressure only on the walls of the bucket. Choose the correct option.

1. Harry's statement is not correct.
2. Neither of them is correct.
3. Harry's statement is correct.
4. Robert's statement is correct.

Q.

The three vessels shown in figure have same base area. Equal volumes of a liquid are poured in three vessels. The force on the base will be

1. Maximum in vessel B

2. Maximum in vessel A

3. Maximum in vessel C

4. Equal in all the vessels