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Dear Student, Read question and answers
 |
| Mr. Vipin .R |
| (HSST Physics) |
| GHSS South Ezhippuram |
Q1. The ratio of radii of two wires of same material is 2:1 . if they are stretched by the same force, the ratio of stress is...
Answer : 1:4
Hint :
Stress=
Force
/Area
since
force is same S1/S2 =A2/A1. S1/S2=πr22
/
π
r12
=1/4
Q2. ' Torr ' is the unit of.....
Answer : Pressure
Q3. Which of the following works on Pascal’s law?
Answer : Hydraulic Lift
Q4. A weight is suspended from a long metal wire. If the wire suddenly breaks, its temperature....
Answer : Rises
Hint : When the wire stretches to it maximum tensile limit
( maximum force that can be borne by the wire), it snaps.
During this process, the pent-up energy is suddenly released
in the form of heat, causing the temperature to rise.
Q5. If the density of a material increases, the value of Young’s modulus.....
Answer : Increases
Hint : Densification increases the amount of material in the
cross section, and hence stiffens of the material, as a result
Young’s modulus increases.
Q6. The ratio of lateral strain to longitudinal strain is called....
Answer : Poisson’s ratio
Q7. What happens to the compressibility of the material
when bulk modulus increases?
Answer : Decreases
Hint: bulk modulus B=1/k
Q8. Which one is the application of Bernoulli’s principle?
Answer : Magnus effect
Hint: Magnus effect is associated with the spinning of ball
due to variation in pressure
Q9. Which expression shows the pressure inside a liquid bubble, P ?
Answer : P=4S/R
Hint: liquid bubble has two free surfaces so pressure is p=4s/R
Q10. A droplet of liquid is formed when the angle of contact is .....
Answer : Obtuse
Hint: it is the angle at which a liquid interface meets a solid surface
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