Physics Mcqs Test Preparation for ECAT & MCAT - Set 2

1)   Work done will be maximum if the angle between the force F and displacement d is

a. 45?
b. 90?
c. 180?
d. 0?
Answer  Explanation 

ANSWER: 0?

Explanation:
No explanation is available for this question!


2)   A field in which the work done in a moving a body along closed path is zero is called

a. electric field
b. conservative field
c. electromagnetic field
d. gravitational field
Answer  Explanation 

ANSWER: conservative field

Explanation:
No explanation is available for this question!


3)   When a force is parallel to the direction of motion of the body, then work done on the body is

a. zero
b. minimum
c. infinity
d. maximum
Answer  Explanation 

ANSWER: maximum

Explanation:
No explanation is available for this question!


4)   Which of the following types of force can do no work on the particle on which it acts?

a. frictional force
b. gravitational force
c. elastic force
d. centripetal force
Answer  Explanation 

ANSWER: centripetal force

Explanation:
No explanation is available for this question!


5)   If a body a mass of 2 kg is raised vertically through 2m, then the work done will be

a. 38.2 J
b. 392.1 J
c. 39.2 J
d. 3.92 J
Answer  Explanation 

ANSWER: 39.2 J

Explanation:
No explanation is available for this question!


6)   An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction, the work done is

a. 3.5 x 103 J
b. 3.5 x 104 J
c. 3.5 x 106 J
d. 3.5 x 109 J
Answer  Explanation 

ANSWER: 3.5 x 109 J

Explanation:
No explanation is available for this question!


7)   The average power and instantaneous power become equal if work is done at

a. any rate
b. at variable rate
c. at uniform rate
d. at high rate
Answer  Explanation 

ANSWER: at uniform rate

Explanation:
No explanation is available for this question!


8)   The relation between horse power and watt is

a. 1 hp = 546 watts
b. 1 hp = 746 watts
c. 1 hp = 1000 watts
d. 1 hp = 946 watts
Answer  Explanation 

ANSWER: 1 hp = 746 watts

Explanation:
No explanation is available for this question!


9)   Proton electron neutron and a particles have same momentum. Which of them have highest K.E?

a. Proton
b. electron
c. neutron
d. a-particle
Answer  Explanation 

ANSWER: electron

Explanation:
No explanation is available for this question!


10)   Slope of work time graph is equal to

a. displacement
b. acceleration
c. power
d. energy
Answer  Explanation 

ANSWER: power

Explanation:
No explanation is available for this question!


11)   Work done by variable force is determine by dividing

a. force into small interval
b. displacement into small interval
c. both force and displacement into small intervals
d. force into small and displacement into large intervals
Answer  Explanation 

ANSWER: displacement into small interval

Explanation:
No explanation is available for this question!


12)   Work done on the body equals to the

a. change in its K.E always
b. change in its P.E always
c. change in its K.E and change in its P.E
d. neither change in K.E and nor change in its P.E
Answer  Explanation 

ANSWER: change in its K.E and change in its P.E

Explanation:
No explanation is available for this question!


13)   The escape velocity of a body in gravitational field of earth is independent of

a. its mass
b. the angle at which it is thrown
c. both its mass and the angle at which it is thrown
d. gravitational field of earth
Answer  Explanation 

ANSWER: both its mass and the angle at which it is thrown

Explanation:
No explanation is available for this question!


14)   The tides raise the mater in the see roughly in a day

a. once
b. twice
c. four time
d. eight time
Answer  Explanation 

ANSWER: twice

Explanation:
No explanation is available for this question!


15)   The source of geothermal energy is

a. decay of radioactive element in the earth
b. compression of material in the earth
c. residual lost of the earth
d. all as said in a - b and c
Answer  Explanation 

ANSWER: all as said in a - b and c

Explanation:
No explanation is available for this question!


16)   The highest value of escape velocity in solar system is planet

a. Earth
b. Neptune
c. Jupiter
d. Moon
Answer  Explanation 

ANSWER: Jupiter

Explanation:
No explanation is available for this question!


17)   Work done by the force of friction is

a. always positive
b. always negative
c. positive only for small frictional force
d. positive only for large frictional force
Answer  Explanation 

ANSWER: always negative

Explanation:
No explanation is available for this question!


18)   Gravitational P.E of a body has

a. no formula
b. a formula mgh only
c. a formula
d. no general formula
Answer  Explanation 

ANSWER: no general formula

Explanation:
No explanation is available for this question!


19)   If velocity is doubled then

a. momentum increases 4 times and K.E increases 2 times
b. momentum and K.E. remain same
c. momentum increases 2 times and K.E increases constant
d. momentum increases 2 times and K.E increases 4 time
Answer  Explanation 

ANSWER: momentum increases 2 times and K.E increases 4 time

Explanation:
No explanation is available for this question!


20)   When the speed of a moving body is doubled then

a. its K.E is doubled
b. its acceleration is doubled
c. its P.E is doubled
d. its momentum is doubled
Answer  Explanation 

ANSWER: its momentum is doubled

Explanation:
No explanation is available for this question!


21)   One mega watt hour is equal to

a. 36 x 106 J
b. 36 x 1012 J
c. 36 x 109 J
d. 36 x 108 J
Answer  Explanation 

ANSWER: 36 x 108 J

Explanation:
No explanation is available for this question!


22)   Which of the following is not conservative force

a. friction
b. electric
c. gravitational
d. magnetic
Answer  Explanation 

ANSWER: friction

Explanation:
No explanation is available for this question!


23)   Work has the dimension as that of same as that of

a. torque
b. angular momentum
c. linear momentum
d. power
Answer  Explanation 

ANSWER: torque

Explanation:
No explanation is available for this question!


24)   The consumption of energy by a 60 watt bulb in 2 sec is

a. 120 J
b. 60 J
c. 30 J
d. 0.02 J
Answer  Explanation 

ANSWER: 120 J

Explanation:
No explanation is available for this question!


25)   The relation between the escape velocity V esc and orbital speed Vo is given by

a. V esc = 1/2Vo
b. V esc = ?2 Vo
c. V esc = Vo
d. V esc = 2Vo
Answer  Explanation 

ANSWER: V esc = ?2 Vo

Explanation:
No explanation is available for this question!


26)   The escape velocity form the earth surface in km S-1 is

a. 4.2 km S-1
b. 7.5 km S-1
c. 9.5 km S-1
d. 1.1 km S-1
Answer  Explanation 

ANSWER: 1.1 km S-1

Explanation:
No explanation is available for this question!


27)   If moon radius is 1600 km and g on its surface is 1.6 ms-2 then the escape velocity on the moon is

a. 1600 ms-1
b. 50.6 ms-1
c. 71.6 ms-1
d. 2263ms-1
Answer  Explanation 

ANSWER: 50.6 ms-1

Explanation:
No explanation is available for this question!


28)   When two protons are brought together

a. Kinetic energy increases
b. P.E. between them increases
c. P.E. between them decreases
d. P.E. between tem does not change
Answer  Explanation 

ANSWER: P.E. between them increases

Explanation:
No explanation is available for this question!


29)   When arrow is released form its bow, its energy is transformed from

a. heat energy to K.E
b. elastic P.E to K.E
c. elemical energy to elastic P.E
d. K.E to elastic P.E.
Answer  Explanation 

ANSWER: elastic P.E to K.E

Explanation:
No explanation is available for this question!


30)   A man lifts vertically a weight of 40kg through 1m in 10s; while a chile lifts vertically a weight of 10kg through a distance of 1m in 1s. What will be correct inference?

a. man does more work than child
b. child does more work than man
c. both do the same amount of work
d. it is a foolish question
Answer  Explanation 

ANSWER: child does more work than man

Explanation:
No explanation is available for this question!


31)   The work done by friction is

a. positive
b. negative
c. zero
d. none of these
Answer  Explanation 

ANSWER: negative

Explanation:
No explanation is available for this question!


32)   The area under the force displacement graph represents

a. area
b. work done
c. power
d. none of these
Answer  Explanation 

ANSWER: work done

Explanation:
No explanation is available for this question!


33)   The dimension of power is

a. [ML2T-3]
b. [ML2T-2]
c. [ML2T3]
d. none of these
Answer  Explanation 

ANSWER: [ML2T-3]

Explanation:
No explanation is available for this question!


34)   Propulsion force of a rocket is

a. non-conservative force
b. conservative force
c. both (a) and (b)
d. non of these
Answer  Explanation 

ANSWER: non-conservative force

Explanation:
No explanation is available for this question!


35)   The dot product of force and velocity is

a. power
b. work
c. impulse
d. torque
Answer  Explanation 

ANSWER: power

Explanation:
No explanation is available for this question!


36)   Geothermal energy is a ____________________ source of energy.

a. non-renewable
b. stable
c. renewable
d. none of the above
Answer  Explanation 

ANSWER: renewable

Explanation:
No explanation is available for this question!


37)   The source of tidal energy is

a. sun
b. earth
c. both (a) and (b)
d. moon
Answer  Explanation 

ANSWER: moon

Explanation:
No explanation is available for this question!


38)   ________________ cells converts solar energy into electrical energy

a. rotory
b. photovoltaic
c. galvanic
d. non of these
Answer  Explanation 

ANSWER: photovoltaic

Explanation:
No explanation is available for this question!


39)   On a clear day at noon the solar energy reaching the earth is

a. 1.44kw/m2
b. 1.4kw/m2
c. 1 kw/m2
d. none
Answer  Explanation 

ANSWER: 1 kw/m2

Explanation:
No explanation is available for this question!


40)   Biomass can be converted into fuels by

a. direct combustion
b. fermentation
c. both (a) and (b)
d. none of these
Answer  Explanation 

ANSWER: both (a) and (b)

Explanation:
No explanation is available for this question!