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Physics MCQs with Explanations

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521PhysicsMedium

The minimum wavelength of X-rays can further be reduced by _______________?

AIncreasing the temperature of the filament.

BReducing the pressure or cooling the target

CIncreasing the potential difference between the cathode and the target

DUsing a target element of higher atomic number

Correct answer

C. Increasing the potential difference between the cathode and the target

Explanation

Increasing the potential difference between the cathode and the target is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

522PhysicsMedium

Displacement of the body in S.H.M is equal to amplitude when the body is at_______________?

AElsewhere

BExtreme position

CMean position

DNone

Correct answer

B. Extreme position

Explanation

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

523PhysicsMedium

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

AReflection

BInterference

CPolarization

DDiffraction

Correct answer

D. Diffraction

Explanation

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

524PhysicsMedium

A convex lens acts as a diverging lens if the_________________?

Aboth B and C

Bobject is beyond C

Cif the object is within f

Dif the object is with in C

Correct answer

A. both B and C

Explanation

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

525PhysicsMedium

The reverse of LED is______?

ACapacitor

BPhotodiode

CResistor

DDiode

Correct answer

B. Photodiode

Explanation

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

526PhysicsMedium

One torr is equal to_________________?

A1.333 Nm-2

B.1333 Nm-2

C133.3 Nm2

D13.33 Nm-2

Correct answer

C. 133.3 Nm2

Explanation

133.3 Nm2 is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

527PhysicsMedium

If a wheel of radius r turns through an angle of 30° then the distance through which any point on its rim moves is______________?

AV/30 x r

Bπ / 180 x r

Cπ/6 x r

Dπ /3 x r

Correct answer

C. π/6 x r

Explanation

π/6 x r is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

528PhysicsMedium

The specially designed semi-conductor diodes used as fast counters in electronic circuits are______________?

APhoto diodes

BThe light emitting diodes

CSolar cells.

DPhoto voltaic cell

Correct answer

A. Photo diodes

Explanation

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

529PhysicsMedium

The pressure exerted by a column of mercury 76cm high and at 0°C is called_______________?

A1 Newton per square meter

B1 Pascal

Cdata is insufficient

D1 atmosphere

Correct answer

D. 1 atmosphere

Explanation

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

530PhysicsMedium

When two protons are brought together_____________________?

AP.E. between tem does not change

BP.E. between them decreases

CKinetic energy increases

DP.E. between them increases

Correct answer

D. P.E. between them increases

Explanation

P.E. between them increases is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

The minimum wavelength of X-rays can further be reduced by _______________?

AIncreasing the temperature of the filament.

BReducing the pressure or cooling the target

CIncreasing the potential difference between the cathode and the target

DUsing a target element of higher atomic number

Correct answer

C. Increasing the potential difference between the cathode and the target

Explanation

Increasing the potential difference between the cathode and the target is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

When two protons are brought together_____________________?

AP.E. between tem does not change

BP.E. between them decreases

CKinetic energy increases

DP.E. between them increases

Correct answer

D. P.E. between them increases

Explanation

P.E. between them increases is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.