Distribution of Pressure

Q. The period of a body under SHM i.e. presented by T = $P^a{D}^b{S}^c$ ; where P is pressure, D is density and S is surface tension. The value of a, b and c are

1. 
2. 
3. -1, -2, 3
4. 

Q. Why are dams made thicker at the bottom?

1. To withstand the high pressure at the liquid at the bottom
2. To withstand atmospheric pressure
3. To generate more electricity
4. To store more water

Q. Why are wide wooden sleepers kept below railway tracks?

1. To decrease pressure on the ground.
2. To increase the pressure on the ground.
3. To make the railway tracks look good.
4. To provide direction to the passing train.

Q.

Explain the properties of fluid pressure?

Q.

A closed compartment containing gas is moving with some acceleration in the horizontal direction. Neglect effect of gravity. Then the pressure in the compartment is

1. Same everywhere

2. Lower in front side

3. Lower in the rear side

4. Lower in the upper side

Q.

Two women are of the same weight. One wears sandals with pointed heels while the other wears sandals with flat soles. Which one would feel more comfortable while walking on a sandy beach? Give reasons for your answer.

Q.

When strong/high-speed wind blows, an umbrella held upright at times gets upturned. Explain the reason.

Q.

A brick having weight 30 N is 21 cm long, 10 cm wide and 6 cm high. The face of the brick on the ground having dimensions 21 cm and 6 cm is in contact with the ground. Find the pressure exerted on the ground by the face of brick.

Q.

Define pressure and write its SI unit.

Q.

Two tanks with different water are connected using a pipe at the bottom. Then the water will flow through the pipe till the:

1. Boyle

2. Bernoulli

3. Archimedes

4. Pascal

Q.

When a thrust of $20N$ is applied on a surface area of $10c{m}^2$, find the pressure.

Q. The surface area of the base of a brick X kept on a surface is 100 $c{m}^2$ and that of the brick Y is 250 $c{m}^2.$ If each brick weighs 100 N, which of the following is correct if $P_1$ and $P_2$ are the pressures exerted by bricks X and Y respectively?

1. $P_1=P_2$
2. $P_1<P_2$
3. $P_1=P_2=0$
4. $P_1>P_2$

Q. A thrust of 20 N is acting on an area of 2 $m^2$. How much pressure is acting on the surface?

1. $5N{m}^{-2}$
2. $10N{m}^{-2}$
3. $20N{m}^{-2}$
4. $40N{m}^{-2}$

Q.

Explain, why a truck or a motor bus has much wider tyres?

Q.

Tank trailors are provided with $16wheels$ so as to:

1. increase pressure on the road

2. decrease pressure on the road

3. support the weight of the tank

4. none of the above

Q. What is the pressure on a swimmer 20 m below the surface of water?

Q.

Pressure exerted by anybody can be increased by

1. increasing force applied

2. reducing area of contact

3. both (a) and (b)

4. none of these

Q.

A camel walks more easily on a sandy surface than a man. Why?

Q.

Why are railway tracks laid on large-sized concrete sleepers? Explain.

Q.

Why are heavy trawlers fitted with a large number of wheels?

Q.

During flight, the weight of the plane is balanced by?

Q. Define thrust. What is the up thrust experienced by a balloon of volume 120$m^3$ filled with hydrogen. The density of air = 1.140 $\frac{kg}{m^3}$ and density of hydrogen = 0.081$\frac{kg}{m^3}$ at room temperature. What is the maximum weight this balloon can lift? [3 MARKS]

Q. What is atmospheric pressure? What causes it?

Q.

Why is it difficult to hold a school bag having a strap made of a thin and strong string?

Q.

Define pressure.

Q. A sharp knife cuts better. Why?

Q. Which of the following is equivalent to 1 pascal?

1. $1m{N}^{-2}$
2. $1cm{N}^{-2}$
3. $1N{m}^{-2}$
4. $1N{cm}^{-2}$

Q.

A fly was sitting on a block. A man draws a circle of the area ${2cm}^2$, enclosing the fly. He then applies a force of 20N and kills it with a flat stick. Calculate the pressure on that area.

1. Pa

2. Pa

3. Pa

4. Pa

Q.

Explain why a truck or motorbus has much wider tyres.

Q. In the following system, the holes of the same size A and B are made at the same level. Let the speed of the water emerging from the two holes be $v_A$ and $v_B$ respectively. Which among the following option is correct?

1. $v_A>v_B$
2. $v_A<v_B$
3. $v_A=v_B$
4. $v_A=1/v_B$