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Physics MCQs with Explanations

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241PhysicsMedium

Various types of cancer are treated by_________________?

AStrontium-90

BCobalt-60

CNickel-63

DCarbon-14

Correct answer

B. Cobalt-60

Explanation

Cobalt-60 is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

242PhysicsMedium

Random errors can be reduced by_______________?

AComparing the instrument with another more accurate one

BTaking zero correction

CAll methods explained in A, B and C

DTaking mean of several measurements

Correct answer

D. Taking mean of several measurements

Explanation

Taking mean of several measurements is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

243PhysicsMedium

A vector can be multiplied by a number. The number may be_______________?

ADimensionless

BNegative

CAll A, B and C are correct

DDimensional scalar

Correct answer

C. All A, B and C are correct

Explanation

All A, B and C are correct is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

244PhysicsMedium

When two bodies move toward each other with constant speeds the distance between them decreases at the rate of 6m / sec. If they move in the same direction the distance between them increases at the rate of 4m/sec. Then their speeds are________________?

A3m/s, 3m/s

B4m/s, 2m/s

C5m/s, 1m/s

D6m/s, 1m/s

Correct answer

C. 5m/s, 1m/s

Explanation

5m/s, 1m/s is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

245PhysicsMedium

If we whirl a stone at the end of a string in the vertical circle, it is likely to break when the stone is________________?

AAt the highest point

BAt any point during motion

CAt the point where gravity is not acting

DAt the lowest point

Correct answer

D. At the lowest point

Explanation

At the lowest point is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

246PhysicsMedium

Electrical resonance is observed in_______________?

ARadio

BNeither in radio nor in a microwave oven

CMicrowave oven

DBoth in radio and microwave oven

Correct answer

A. Radio

Explanation

Radio is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

247PhysicsMedium

A lens which converges a beam of parallel rays to a point is called______________?

Adiverging (or concave) lens

Bplano concave lens

Cconverging (or convex) lens

Dplano convex lens

Correct answer

C. converging (or convex) lens

Explanation

converging (or convex) lens is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

248PhysicsMedium

The uncertainty in a measurement may occur due to_______________?

ANatural variation of the object to be measured

BAll given in A, B and C

CInadequate technique

DLimitation of an instrument

Correct answer

B. All given in A, B and C

Explanation

All given in A, B and C is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

249PhysicsMedium

Which of the following pair has same direction always ?

Aforce, acceleration

Bforce, velocity

Cforce, displacement

Dforce, momentum

Correct answer

A. force, acceleration

Explanation

force, acceleration is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

250PhysicsMedium

Beta particles ionize an atom_________________?

ADue to the gravitational force

BDue to a direct collision

CDue to the electrostatic force of repulsion

DDue to the electrostatic force of attraction

Correct answer

C. Due to the electrostatic force of repulsion

Explanation

Due to the electrostatic force of repulsion is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

Random errors can be reduced by_______________?

AComparing the instrument with another more accurate one

BTaking zero correction

CAll methods explained in A, B and C

DTaking mean of several measurements

Correct answer

D. Taking mean of several measurements

Explanation

Taking mean of several measurements is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

The uncertainty in a measurement may occur due to_______________?

ANatural variation of the object to be measured

BAll given in A, B and C

CInadequate technique

DLimitation of an instrument

Correct answer

B. All given in A, B and C

Explanation

All given in A, B and C is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

Beta particles ionize an atom_________________?

ADue to the gravitational force

BDue to a direct collision

CDue to the electrostatic force of repulsion

DDue to the electrostatic force of attraction

Correct answer

C. Due to the electrostatic force of repulsion

Explanation

Due to the electrostatic force of repulsion is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.