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Class 11 Physics (Part Ii) Chapter 11 Mechanical Properties Of Solids Quiz 7 (25 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. When a block of mass M is suspended by a long wire of length L the length of the wire becomes (L+l). The elastic potential energy of the wire is

Correct Answer: C) 1/2Mgl.

2. The loss of elasticity in a material due to repeated application of deforming forces is called

Correct Answer: B) Elastic fatigue.

3. A physical property of a substance is ..... (fill the space)

Correct Answer: A) The property that can be observed or measured without changing the substance.

4. Use of ball bearings converts

Correct Answer: B) Kinetic friction to rolling friction.

5. The Bulk modulus for an incompressible liquid is

Correct Answer: C) Infinity.

6. Stress is a ratio of .....

Correct Answer: B) Force to Area.

7. The value of acceleration due to gravity is maximum at the .....

Correct Answer: C) Poles.

8. A body weighs 980 N on Earth. What is its mass? ( $g=9.8\, \text{m s}^{-2}$

Correct Answer: C) 100 kg.

9. Which one of the following is an ohmic conductor?

Correct Answer: C) Copper.

10. Choose the correct dimensional formula for force.

Correct Answer: A) $MLT^{-2}$.

11. A wire is stretched through 1 mm by certain load. The extension produced in the wire of same material with double the length and double the radius by the same load will be:

Correct Answer: A) 0.5 mm.

12. Discuss the properties of solids that affect their mechanical behavior.

Correct Answer: C) Elasticity, plasticity, hardness, toughness, ductility, brittleness, and strength.

13. In magnitude hydraulic stress is equal to:

Correct Answer: B) Hydraulic excess pressure.

14. A fluid's resistance to flow is its

Correct Answer: A) Viscosity.

15. Which state of matter has tightly packed molecules?

Correct Answer: A) Solid.

16. List the types of strain that can occur in materials.

Correct Answer: A) Elastic strain, plastic strain, thermal strain, shear strain.

17. The pressure of a liquid in the tube will increase if the velocity of the liquid will be

Correct Answer: B) Decreased.

18. The ice point of water in Fahrenheit is

Correct Answer: A) 32 $^\circ$F.

19. Two wires made of same material are subjected to forces in the ratio 1:4. Their lengths are in the ratio 2:1 and diameters in the ratio 1:3. What is the ratio of their extensions:

Correct Answer: C) 9:2.

20. A sample of metal weights 210 grams in air, 180 grams in water and 120 grams in an unknown liquid. Then:-

Correct Answer: B) The density of metal is 7 g/cm3.

21. For ductile materials, the ultimate tensile strength and fracture point is .....

Correct Answer: A) Far apart.

22. The reciprocal of bulk modulus is called .....

Correct Answer: B) Compressibility.

23. Gravitational force

Correct Answer: D) All the above.

24. Bulk modulus measures the resistance offered by gases, liquids or solids while an attempt is made to change the .....

Correct Answer: C) Volume.

25. Two soap bubbles each of radius r are touching each other. The radius of curvature of the common surface will be:

Correct Answer: D) Infinite.

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