# Physics GK Questions SET-7

Here you will find GK MCQ Questions for physics GK questions with Answers PDF Free Download based on the important concepts and topics given in the textbook as per new exam pattern. This may assist you to understand and check your knowledge about the physics GK questions. Students also can take a free test of the Multiple Choice Questions of physics GK questions. Each question has four options followed by the right answer.

## Q1.What is the order of distance for Vander Wall forces to be active?

[A] 10–6 metre
[B] 10–7 metre
[C] 10–8 metre
[D] 10–9 metre

Correct Answer: D [10–9 metre]

## Q2.What will be the apparent frequency when the both source of the sound and listener move in the same direction with same velocity?

[A] it will be more than the actual frequency
[B] it will be less than the actual frequency
[C] it will be equal to the actual frequency
[D] None

Correct Answer: C [it will be equal to the actual frequency]

## Q3.Which of the following is correct about the rate of loss of heat of the body, as per the Newton’s law of cooling?

[A] It is directly proportional to the difference of body’s temperature and the surroundings
[B] It is inversely proportional to the difference of body’s temperature and the surroundings
[C] It is equal to the difference of body’s temperature and the surroundings
[D] None of the above

Correct Answer: A [It is directly proportional to the difference of body’s temperature and the surroundings]

## Q4.Which of the following is correct about Permeability of free space?

[A] It is a scalar quantity
[B] Its S.I unit is T m A-1
[C] Both a and b
[D] None of the above

Correct Answer: C [Both a and b]

## Q5.What is the output of an OR gate when both the inputs are 1?

[A] 0
[B] 1
[C] Either 0 or 1
[D] None

Correct Answer: B [1]

## Q6.Which of the following is correct about Surface Tension?

[A] It is a scalar quantity
[B] It is a molecular phenomenon
[C] Its root cause is the electromagnetic forces
[D] All of the above

Correct Answer: D [All of the above]

## Q7.Which of the following is correct about the speed of the sound, at same temperature?

[A] sound travels faster in humid air than in dry air
[B] sound travels slower in humid air than in dry air
[C] speed of sound is same in humid air and dry air
[D] None of the above

Correct Answer: A [sound travels faster in humid air than in dry air]

## Q8.What is the temperature range used in the definition of a calorie?

[A] 12.5° C to 13.5° C
[B] 13.5° C to 14.5° C
[C] 14.5° C to 15.5° C
[D] 15.5° C to 16.5° C

Correct Answer: C [14.5° C to 15.5° C]

## Q9.What do we call an arrangement of two unlike poles of equal strength separated by a small distance?

[A] Magnetic dipole
[B] Solenoid
[C] Toroid
[D] Electric dipole

Correct Answer: A [Magnetic dipole]

## Q10.Which type of semiconductor do we get when pure silicon is doped with a group-3 element?

[A] n-type semiconductor
[B] p-type semiconductor
[C] Intrinsic semiconductor
[D] None

Correct Answer: B [p-type semiconductor]

## Q11.What do we call the resistance offered by the electrolyte and electrodes when the current flows?

[A] External resistance
[B] Internal resistance
[C] Electrolytic power
[D] Electrode Potential

Correct Answer: B [Internal resistance]

## Q12.Which of the following material is commonly used to make control rods in a nuclear reactor?

[A] Indium
[B] Boron
[C] Cadmium
[D] All of the above

Correct Answer: D [All of the above]

## Q13.Which of the following about S.H.M is correct?

[A] In S.H.M. acceleration is maximum at extreme position
[B] In S.H.M. velocity is minimum at extreme position
[C] Both a and b
[D] None of the above

Correct Answer: C [Both a and b]

## Q14.Which of the following is correct about the speed of the sound, at same temperature?

[A] sound travels faster in humid air than in dry air
[B] sound travels slower in humid air than in dry air
[C] speed of sound is same in humid air and dry air
[D] None of the above

Correct Answer: A [sound travels faster in humid air than in dry air]

## Q15.Which of the following metal foils was used in the Rutherford’s alpha particle scattering experiment?

[A] Copper
[B] Silver
[C] Gold
[D] Aluminium

Correct Answer: C [Gold]

## Physics GK

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