Test Details

Force and Pressure

Solve this test. Marks will be declare in next online class

Feb 04, 8:00 PM

60 minutes

Feb 05, 8:00 PM

50.0 marks

MCQ

25 questions

Praveen Kumar Giri

I'm working at LSDP Public School from last 2 years as a lab assistant and as a Science teacher also. Join my class to know about Science and Mathematics.

Class Details

Science

Class-8th

Science

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Question Text

Question 1 :
The foundations of high rise building are kept wide so that they exert less pressure on the ground and prevent the building from sinking into the ground.

Question 3 :
The pressure at the bottom of a tank containing a liquid does not depend on [CBSE PMT 1994] [Kerala (Engg.)2002]

Question 5 :
A force of $15 N$ increases the length ofaby $1 \mathrm { mm }$. The additional force requireincrease the length by $2.5 \mathrm { mm }$ in N is

Question 6 :
In a wind tunnel experiment, the pressures on the upper and lower surfaces of the wings are 0.90 x$10^5$ Pa and 0.91 x 10$^5$ Pa respectively. If the area of the wing is 40 m$^2$ the net lifting force on the wing is

Question 7 :
Why does a straw get attracted towards another straw which is rubbed with a sheet of paper?

Question 9 :
Ask a friend to drive a small nail into a piece of wood placed on top of a pile of books on your head. Why doesn't this hurt you?

Question 10 :
If in a system of forces acting on a rigid body R.G  $\neq $ 0, then the given system of forces is equivalent to

Question 11 :
A steam of water flowing horizontally with a speed of $25 ms^{-1}$ gushes out of a tube of cross-sectional area $10^{-3}m^2$, and hits at a vertical wall nearby. What is the force exerted on the wall by the impact of water?

Question 12 :
Calculate the water pressure and the thrust at the bottom of a tank whose length, width and the depth are $2\;m,1.5\;m\;and\;1\;m$ respectively. Density of water is $1000\;kg\;m^{-3}$.

Question 13 :
A force $150N$ acts on a body mass $10kg$ for $5s$. The change in velocity in

Question 14 :
 What is the difference in the masses of the pieces,$m_1=20.17 g $ ,$m_2=20.15 g?$ (upto two decimal places)

Question 16 :
Calculate the pressure if a force of $2 N$ is applied on an area of $2 mm^{2}$:

Question 17 :
Identify the following shows the application of pressure in our everyday life?

Question 18 :
A girl stands on a box having 60 cm length, 40 cm breadth and 20 cmwidth in three ways. The pressure exerted by the box will be:

Question 19 :
The average depth of Indian ocean is about 3000 m Bulk Modulus of water is $2.2\times 10^4\ N/m^2$ ,$g=10 \ m/s^2$,then the fractional compression is $\dfrac{\Delta V}{V}$ of water at the bottom of Indian Ocean is:

Question 20 :
A barometer tube, containing mercury, is lowered in a vessel containing mercury until only $50 cm$ of the tube is above the level of mercury in the vessel. If the atmospheric pressure is $75 cm$ of mercury, what is the pressure at the top of the tube

Question 21 :
Calculate the greatest and least pressure exerted by a metal block of size $20cm\times 8cm\times 5cm$ and having mass $5kg$. Take $g=10m/s^2$.

Question 22 :
When the pressure of water is increased, the boiling temperature of water as compared to $100^oC$ will be :

Question 23 :
A rectangular block has length, breadth andheight of 30 cm, 20 cm and 10 cm, respectively.Which one ofthe following statements is correct?

Question 24 :
A force of $400 N$ exerts a pressure of $20 N/cm^{2}$. What is the area on which the force acts?

Question 25 :
Assertion: In liquid retaining structures with fixed or floating covers the gas pressurevdeveloped above liquid surface shall be added to the liquid pressure. Reason: In plane walls, the liquid pressure is resisted by both vertical and horizontal bending moments.

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