Q. The basic difference between an AC generator and a DC generator is that -
1) AC generator has an electromagnet while a DC generator has permanent magnet.
2) AC generator has slip rings while the DC generator has a commutator.
3) DC generator will generate a higher voltage.
4) AC generator will generate a higher voltage.
Q. Why are dewdrops not formed on a cloudy night?
1) Clouds absorb the radiation released from the Earth's surface.
2) Clouds reflect back the Earth's radiation
3) The Earth's surface would have low temperature on cloudy nights
4) Clouds deflect the blowing wind to ground level
Q. Which of the following law states that Under Elastic limit, stress is directly proportional to strain?
1) Stefan's Law
2) Hooke's Law
3) Newton's Law
4) Kirchoff's Law
Q. Who is credited with the discovery of the Law of Electrical Resistance?
1) G. S. Ohm
2) Michael Faraday
3) Coulomb
4) Marconi
Q. Which one of the following statements is not correct?
1) Fischer projection represents the molecule in eclipsed conformation
2) Newman projection can be represented in eclipsed, stagged and skew conformations
3) Fischer projection of the molecule is its most stable conformation
4) In Sawhorse projections, the lines are inclined at an angle of 120° to each other
Q. Very small insoluble particles in a liquid may be separated from it by using -
1) crystallization
2) fractional distillation
3) centrifugation
4) decantation
Q. Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)
1) the gold piece will weigh more
2) the silver piece will weigh more
3) both silver and gold pieces weigh equal
4) weighing will depend on their masses
Q. For an ideal gas, which one of the following statements does not hold true?
1) The speed of all gas molecules is same
2) The kinetic energies of all gas molecules are not same
3) The potential energy of the gas molecules is zero
4) There is no interactive force between the molecules
Q. Hooke's law is valid for -
1) only proportional region of the stress-strain curve
2) entire stress-strain curve
3) entire elastic region of the stress-strain curve
4) elastic as well as plastic region of the stress-strain curve
Q. Which one of the following is the correct sequence of passage of light in a compound microscope?
1) Condenser - Objective lens - Eyepiece - Body tube
2) Objective lens - Condenser - Body tube - Eyepiece
3) Condenser - Objective lens - Body tube - Eyepiece
4) Eyepiece - Objective lens - Body tube - Mirror
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