Physics MCQs Test 8

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1. Which one is the correct relation for fundamental frequency of open and closed pipe ?

  • A. fopen = 2 fclosed
  • B. fclosed = 2fopen
  • C. fopen = fclosed
  • D. fopen = 1 / f closed
See Answer
A. fopen = 2 fclosed
2. Newton estimated the speed of sound _____________________?

  • A. 281m/sec
  • B. 333m/sec
  • C. 340m/sec
  • D. all of the above
See Answer
A. 281m/sec
3. The speed of sound in hydrogen is _____________ time than that in oxygen?

  • A. Two times
  • B. Three times
  • C. Four time
  • D. Six time
See Answer
C. Four time
4. The speed of stationary waves in a stretched string are independent of___________________?

  • A. Number of loops
  • B. Tension in the string
  • C. Point where string is plucked
  • D. both A and C
See Answer
D. both A and C
5. Which phenomena can be applied to estimate the velocity of star with respect to earth ___________________?

  • A. Dopplers effect
  • B. Interference of waves
  • C. Beats phenomena
  • D. All of these
See Answer
A. Dopplers effect
6. The waves that require a material medium for their propagation are called__________________?

  • A. matter waves
  • B. electromagnetic waves
  • C. carrier waves
  • D. mechanical waves
See Answer
D. mechanical waves
7. When two identical traveling waves are superimposed, the velocity of the resultant wave__________________?

  • A. decreases
  • B. increases
  • C. remains unchanged
  • D. becomes zero
See Answer
C. remains unchanged
8. If stretching force T of wire increases, then its frequency __________________?

  • A. decreases
  • B. increases
  • C. remains the same
  • D. any of above
See Answer
B. increases
9. It is possible to distinguish between transverse and longitudinal waves form the property of __________________?

  • A. refraction
  • B. polarization
  • C. interference
  • D. diffraction
See Answer
B. polarization
10. Sound waves do not travel in vacuum because ___________________?

  • A. they are transverse waves
  • B. they are stationary waves
  • C. they require material medium for propagation
  • D. they do not have enough energy
See Answer
C. they require material medium for propagation

11. What are the dimensions of stress?

  • A. MLT-2
  • B. ML-2T-1
  • C. ML-1T-2
  • D. ML-T-1
See Answer
C. ML-1T-2
12. Which one of the following physical quantities does not have the dimensions of force per unit area?

  • A. Stress
  • B. Strain
  • C. Youngs modulus
  • D. Pressure
See Answer
B. Strain
13. A wire of length L is stretched by a length E when a force F is applied at one end. If the elastic limit is not exceeded the amount of energy stored in the wire is_________________?

  • A. FE
  • B. (FE)
  • C. FE2/L
  • D. FE2
See Answer
B. (FE)
14. When a force is applied at one end of an elastic wire it produces a strain ∝ in the wire. If y is the Youngs modulus of the material of the wire the amount of energy stored per unit volume of the wire is given by_________________?

  • A. Y∝
  • B. 2Y∝
  • C. Y∝/2
  • D. Y∝2
See Answer
D. Y∝2
15. A wire suspended vertically from one end is stretched by attaching a weight of 20N to the lower end. The weight stretches the wire by 1mm. How much energy is gained by the wire ?

  • A. 0.01J
  • B. 0.02J
  • C. 0.04J
  • D. 1.0J
See Answer
A. 0.01J
16. A certain stress applied to an elastic material produces a certain strain in it. If the elastic limit is not exceeded the energy gained per unit volume of the material is given by_________________?

  • A. Stress/strain
  • B. (stress/strain)
  • C. Stress x strain
  • D. (Stress/strain)
See Answer
D. (Stress/strain)
17. The ratio stress to strain in the young modulus of the material then tension is__________________?

  • A. Directly proportional to the extension
  • B. Directly proportional to strain
  • C. Directly proportional to the square of the amplitude
  • D. Inversely proportional to extension
See Answer
A. Directly proportional to the extension
18. A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is____________________?

  • A. The extension of the wire is proportional to the force applied
  • B. The weight of the wire is negligible
  • C. The wire is not stretched beyond its elastic limit
  • D. The cross-sectional area of the wire remains constant
See Answer
A. The extension of the wire is proportional to the force applied
19. Formation of large molecules by joining small molecules is_________________?

  • A. Fusion
  • B. Polymerization
  • C. Crystallization
  • D. Subtraction
See Answer
B. Polymerization
20. The energy band occupied by the valence electrons is called___________________?

  • A. Energy state
  • B. Valence band
  • C. ve energy state
  • D. conduction band
See Answer
B. Valence band
21. A ferromagnet will become fully magnetized at_________________?

  • A. High voltage A.C
  • B. Low voltage A.C
  • C. Alternating current at its peak value
  • D. D.C current at peak value
See Answer
C. Alternating current at its peak value
22. Materials in which valence electrons are tightly bound to their atoms at low temperature are called___________________?

  • A. Semiconductor
  • B. Superconductors
  • C. Insulators
  • D. Conductor
See Answer
C. Insulators
23. The angular position of cells remains the same for a sample of a crystal. This property is called___________________?

  • A. Isotropy
  • B. Cleavage
  • C. Homogeneity
  • D. The external symmetry of the form
See Answer
D. The external symmetry of form
24. If the density of atoms remains the same along any direction in a crystal is called__________________?

  • A. Symmetry
  • B. Homogeneity
  • C. Isotropy
  • D. Cleavage
See Answer
B. Homogeneity
25. The band theory of solids explains satisfactorily the nature of_________________?

  • A. Electrical insulators alone
  • B. Electrical conductors alone
  • C. Electrical semi-conductors alone
  • D. All of the above
See Answer
D. All of the above
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