Basic Physics Mcqs - Set 5

1)   Diffraction fringes are____________________?

a. equally spaced
b. distance between them increases
c. distance between then decreases
d. they are adjacent with no space in between
Answer  Explanation 

ANSWER: distance between then decreases

Explanation:
No explanation is available for this question!


2)   A thing that emits its own light is___________________?

a. luminous
b. non-luminous
c. incandescent
d. bright
Answer  Explanation 

ANSWER: luminous

Explanation:
No explanation is available for this question!


3)   Gives the definition of metre in terms of wavelength of red cadmium light ___________________?

a. Newton
b. Einstein
c. Michelson
d. Galileo
Answer  Explanation 

ANSWER: Michelson

Explanation:
No explanation is available for this question!


4)   Which experiment shows that wavelength of light is smaller than that of sound___________________?

a. Diffraction
b. Polarization
c. Interference
d. Reflection
Answer  Explanation 

ANSWER: Diffraction

Explanation:
No explanation is available for this question!


5)   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!


6)   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!


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)   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!


9)   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!


10)   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!


11)   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!


12)   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!


13)   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!


14)   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!


15)   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!


16)   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!


17)   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!


18)   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!


19)   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!


20)   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!


21)   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!


22)   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!


23)   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!


24)   Work done will be maximum if the angle between the force F and displacement d is______________________?

a. 45°
b. 90°
c. 180°
d.
Answer  Explanation 

ANSWER: 0°

Explanation:
No explanation is available for this question!


25)   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!


26)   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!


27)   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!


28)   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!


29)   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!


30)   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!


31)   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!


32)   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!


33)   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!


34)   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!


35)   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!


36)   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!


37)   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!


38)   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!


39)   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!


40)   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!