MCQOPTIONS
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MCQOPTIONS
This section includes 38 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 |
| Answer» D. D.C current at peak value | |
| 2. |
A completely filled band is called |
| A. | Conduction band |
| B. | Valence band |
| C. | Forbidden band |
| D. | Core band |
| Answer» E. | |
| 3. |
A wire of length L is stretched by a length ? 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. | F? |
| B. | (F?) |
| C. | F? 2/L |
| D. | F?2 |
| Answer» C. F? 2/L | |
| 4. |
A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber? |
| A. | 2x108 Nm-2 |
| B. | 5x106 Nm-2 |
| C. | 0.5x10-6 Nm-2 |
| D. | 0.2x10-6Nm-2 |
| Answer» C. 0.5x10-6 Nm-2 | |
| 5. |
A uniform steel wire of length 4m and area of cross-section 3 10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2 1011 Nm-2 the energy stored in the wire is |
| A. | 0.025J |
| B. | 0.50J |
| C. | 0.75J |
| D. | 0.100J |
| Answer» D. 0.100J | |
| 6. |
If the density of atoms remain same along any direction in a crystal is called |
| A. | Symmetry |
| B. | Homogeneity |
| C. | Isotropy |
| D. | Cleavage |
| Answer» C. Isotropy | |
| 7. |
In a semiconductors the charge carriers are |
| A. | Holes only |
| B. | Electrons only |
| C. | Electron and holes both |
| D. | All of the above |
| Answer» D. All of the above | |
| 8. |
In simple cube one atom or molecule lies at its |
| A. | Force corners |
| B. | Nine corners |
| C. | Eight corners |
| D. | Six corners |
| Answer» D. Six corners | |
| 9. |
Many of the semi conductors are crystals of the type |
| A. | Face centred cubic |
| B. | Body centred cubic |
| C. | Simple cubic |
| D. | All of the above |
| Answer» B. Body centred cubic | |
| 10. |
Materials in which valence electrons are tightly bound to their atoms at low temperature are called |
| A. | Semi conductor |
| B. | Super conductors |
| C. | Insulators |
| D. | Conductor |
| Answer» D. Conductor | |
| 11. |
Materials that undergo plastic deformation before breaking are called |
| A. | Brittle |
| B. | Ductile |
| C. | Amorphous |
| D. | Polymers |
| Answer» C. Amorphous | |
| 12. |
On the basis of band theory of solids the semiconductors have |
| A. | A party filled valence band and totally empty conduction band |
| B. | A completely filled valence band a totally empty conduction band and a very wide forbidden band |
| C. | A completely filled valence band a partially filled conduction band and a narrow forbidden band |
| D. | A partly filled valence band a totally empty conduction band and a wide forbidden band |
| Answer» D. A partly filled valence band a totally empty conduction band and a wide forbidden band | |
| 13. |
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 form |
| Answer» E. | |
| 14. |
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 |
| Answer» E. | |
| 15. |
The bulk properties of materials such as their mode of fracture can be related to their |
| A. | Polymerization |
| B. | Cleavage |
| C. | Microstructure |
| D. | Dislocation |
| Answer» D. Dislocation | |
| 16. |
The breaking of crystals along definite direction is called |
| A. | Cleavage |
| B. | Symmetry |
| C. | Isotropy |
| D. | Homogeneity |
| Answer» B. Symmetry | |
| 17. |
The curie temperature is that at which |
| A. | Semi-conductor becomes conductors |
| B. | Ferromagnetic becomes paramagnetic |
| C. | Paramagnetic becomes diamagnetic |
| D. | Metals become super conductor |
| Answer» C. Paramagnetic becomes diamagnetic | |
| 18. |
The electrons in conduction band are free to |
| A. | Transport vibrations |
| B. | Transport signals |
| C. | Transport charge |
| D. | Transport impulses |
| Answer» D. Transport impulses | |
| 19. |
The energy band occupied by the valence electrons is called |
| A. | Energy state |
| B. | Valence band |
| C. | Ve energy state |
| D. | Conduction band |
| Answer» C. Ve energy state | |
| 20. |
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 |
| Answer» B. 0.02J | |
| 21. |
Coercive force is the force which opposes |
| A. | Demagnetization |
| B. | Breakage |
| C. | Extension |
| D. | Surface cracking |
| Answer» B. Breakage | |
| 22. |
The figure shown the stress-strain graph of a certain substance. Over which region of the graph is Hooks law obeyed? |
| A. | AB |
| B. | BC |
| C. | CD |
| D. | ED |
| Answer» E. | |
| 23. |
A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is |
| A. | (F1+F2) (121+122) |
| B. | (F1+F2) (122-112) |
| C. | (F1+F2) (12-11) |
| D. | (F1+F2) (12-11) |
| Answer» D. (F1+F2) (12-11) | |
| 24. |
A vacant or partially filled band is called |
| A. | Conduction band |
| B. | Valence band |
| C. | Forbidden band |
| D. | Empty band |
| Answer» B. Valence band | |
| 25. |
Any alteration produced in shapes length or volume when a body is subjected to some external force is called |
| A. | Stiffness |
| B. | Toughness |
| C. | Extension |
| D. | Deformation |
| Answer» E. | |
| 26. |
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 |
| Answer» B. The weight of the wire is negligible | |
| 27. |
Energy needed to magnetize and demagnetize is represented by |
| A. | Hysteresis curve |
| B. | Hysteresis loop area |
| C. | Hysteresis loop |
| D. | Straight line |
| Answer» C. Hysteresis loop | |
| 28. |
Formation of large molecule by joining small molecules is |
| A. | Fusion |
| B. | Polymerization |
| C. | Crystallization |
| D. | Subtraction |
| Answer» C. Crystallization | |
| 29. |
Holes can exist in |
| A. | Conductors |
| B. | Insulators |
| C. | Semi conductors |
| D. | All of the above |
| Answer» D. All of the above | |
| 30. |
Very weak magnetic fields are detected by |
| A. | Squids |
| B. | Magnetic resonance imaging (MRI) |
| C. | Magnetometer |
| D. | Oscilloscope |
| Answer» B. Magnetic resonance imaging (MRI) | |
| 31. |
What is the SI unit of modulus of elasticity of substance? |
| A. | Nm-2 |
| B. | Jm-2 |
| C. | Nm-1 |
| D. | Being a number it has no unit. |
| Answer» B. Jm-2 | |
| 32. |
The net charge on n-type material is |
| A. | Positive |
| B. | Negative |
| C. | Both positive and negative |
| D. | Neutral |
| Answer» E. | |
| 33. |
What are the dimensions of stress? |
| A. | MLT-2 |
| B. | ML-2T-1 |
| C. | ML-1T-2 |
| D. | ML?T-1 |
| Answer» D. ML?T-1 | |
| 34. |
The ration stress to strain in youngs modulus of the material then tension is |
| A. | Directly proportional to extension. |
| B. | Directly proportional to strain. |
| C. | Directly proportional to square of amplitude. |
| D. | Inversely proportional to extension. |
| Answer» B. Directly proportional to strain. | |
| 35. |
When a force is applied at one end of an elastic wire it produces at 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. | Y? |
| C. | Y?2 |
| D. | Y?2 |
| Answer» E. | |
| 36. |
Which of the following substances posses the highest elasticity? |
| A. | Rubber |
| B. | Steel |
| C. | Glass |
| D. | Copper |
| Answer» C. Glass | |
| 37. |
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 |
| Answer» C. Youngs modulus | |
| 38. |
With increase in temperature the electrical conductivity of intrinsic semi conductor |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | First increases then decreases |
| Answer» C. Remains same | |