GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 073

GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 073

721). The force of attraction between planets was correctly given by
A). Kepler
B). Newton
C). Galileo
D). Ptolemy

Answer: Newton


   
722). A boat moves forward when water is pushed back. The basic physical law applicable here is
A). Law of floatation
B). Pascal's law
C). Newton's second law of motion
D). Newton's third law of motion

Answer: Newton's third law of motion


   
723). The mass of 5 litres of mercury is
A). 68 Kg
B). 5 Kg
C). 4 Kg
D). 68,000 Kg

Answer: 5 Kg


   
724). Which of the following cannot pass through vacuum?
A). light
B). sound
C). electrical field
D). magnetic field

Answer: sound


   
725). In a dynamo
A). mechanical energy is converted into electrical energy
B). electrical energy is converted into mechanical energy
C). electrical energy is converted into heat energy
D). electrical energy is converted into light energy

Answer: mechanical energy is converted into electrical energy

726). Induced e.m.f. is directly proportional to
A). rate of change of velocity
B). rate of change of flux
C). rate of change of momentum
D). none of the above

Answer: rate of change of flux


   
727). In a step -up transformer ,the number of turns
A). in the primary is more than in the secondary
B). in the secondary is more than in primary
C). is same both in the primary and the secondary
D). none the above

Answer: in the secondary is more than in primary

   
728). Can D.C . Voltage be used in a transformer?
A). yes
B). no
C). some times
D). none of the above

Answer: no


   
729). The condition for the total internal reflection of light is a ray must
A). pass from denser to rarer medium
B). pass from rarer to denser medium
C). be in the same medium
D). none the above

Answer: pass from denser to rarer medium


   
730). Sea water turns into ice at what temperature
A). 4∘ C
B). -2.5∘ C
C). 25∘ C
D). 0∘ C

Answer: 4∘ C