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1) Propulsion force of a rocket is____________________? a. non-conservative force b. conservative force c. both A and B d. none of these
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2) Geothermal energy is a _______________________ source of energy? a. non-renewable b. stable c. renewable d. none of the above
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3) ________________ cells converts solar energy into electrical energy? a. rotory b. photovoltaic c. galvanic d. non of these
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4) Biomass can be converted into fuels by____________________? a. direct combustion b. fermentation c. both A and B d. none of these
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5) Which of the following substances posses the highest elasticity ? a. Rubber b. Steel c. Glass d. Copper
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6) What are the dimensions of stress ? a. MLT-2 b. ML-2T-1 c. ML-1T-2 d. ML-T-1
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7) 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
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8) 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
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9) 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. 2Y∝ c. Y∝/2 d. Y∝2
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10) 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
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11) 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)
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12) 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
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13) 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
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14) Formation of large molecule by joining small molecules is_________________? a. Fusion b. Polymerization c. Crystallization d. Subtraction
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15) The energy band occupied by the valence electrons is called___________________? a. Energy state b. Valence band c. ve energy state d. conduction band
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16) 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
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17) 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
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18) 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
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19) If the density of atoms remain same along any direction in a crystal is called__________________? a. Symmetry b. Homogeneity c. Isotropy d. Cleavage
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20) 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
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21) A completely filled band is called__________________? a. Conduction band b. Valence band c. Forbidden band d. Core band
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22) Which one has the greatest energy gap ? a. Semi conductor b. Conductor c. Metals d. Non metals
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23) With increase in temperature the electrical conductivity of intrinsic semi conductor___________________? a. Decreases b. Increases c. Remains same d. First increases then decreases
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24) 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
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25) Very weak magnetic fields are detected by___________________? a. Squids b. Magnetic resonance imaging (MRI) c. Magnetometer d. Oscilloscope
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26) Energy needed to magnetize and demagnetize is represented by _________________? a. Hysteresis curve b. Hysteresis loop area c. Hysteresis loop d. Straight line
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27) 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.
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28) 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. 2×108 Nm-2 b. 5×106 Nm-2 c. 0.5×10-6 Nm-2 d. 0.2×10-6Nm-2
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29) 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
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30) Materials that undergo plastic deformation before breaking are called __________________? a. Brittle b. Ductile c. Amorphous d. Polymers
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31) 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)
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32) 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
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33) 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
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34) Coercive force is the force which opposes ____________________? a. Demagnetization b. Breakage c. Extension d. Surface cracking
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35) The bulk properties of materials such as their mode of fracture can be related to their____________________? a. Polymerization b. Cleavage c. Microstructure d. Dislocation
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36) The breaking of crystals along definite direction is called _____________________? a. Cleavage b. Symmetry c. Isotropy d. Homogeneity
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37) In simple cube one atom or molecule lies at its______________________? a. Force corners b. Nine corners c. Eight corners d. Six corners
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38) A vacant or partially filled band is called _____________________? a. Conduction band b. Valence band c. Forbidden band d. Empty band
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39) The electrons in conduction band are free to___________________? a. Transport vibrations b. Transport signals c. Transport charge d. Transport impulses
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40) 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
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