16569 + Interview Questions in Physics

1.	When the switch S is closed in the figure given below, the pointer of the galvanometer moves to the right. If S is kept closed, will the pointer : (a) return to zero? (b) stay over on the right? (c) move to the left and stay there (d) move to and fro until S is opened
Answer» When the switch S is closed in the figure given below, the pointer of the galvanometer moves to the right. If S is kept closed, will the pointer : (a) return to zero? (b) stay over on the right? (c) move to the left and stay there (d) move to and fro until S is opened

1.

When the switch S is closed in the figure given below, the pointer of the galvanometer moves to the right. If S is kept closed, will the pointer : (a) return to zero? (b) stay over on the right? (c) move to the left and stay there (d) move to and fro until S is opened

Answer»

When the switch S is closed in the figure given below, the pointer of the galvanometer moves to the right.

If S is kept closed, will the pointer :

(a) return to zero?
(b) stay over on the right?

(c) move to the left and stay there

(d) move to and fro until S is opened

Discussion

2.	Calculate the escape velocity from the moon. The mass of the moon is 7.4×1022 kg and radius 1740 km.
Answer» Calculate the escape velocity from the moon. The mass of the moon is $7.4 \times 10^{22} k g$ and radius 1740 km.

Discussion

3.	Linear magnification (in) produced by a rear view mirror fitted in vehicles : (a) is equal to one (b) is less than one (c) is more than one (d) can be more or less than one depending on the position of object
Answer» Linear magnification (in) produced by a rear view mirror fitted in vehicles : (a) is equal to one (b) is less than one (c) is more than one (d) can be more or less than one depending on the position of object

Discussion

4.	For which colours of light is the refractive index of the material of a prism minimum and maximum?
Answer» For which colours of light is the refractive index of the material of a prism minimum and maximum?

Discussion

5.	If electrons are not used up in electrical appliances, what actually happens so that the appliance starts working?
Answer» If electrons are not used up in electrical appliances, what actually happens so that the appliance starts working?

Discussion

6.	Which of the following statement is correct?
Answer» Which of the following statement is correct?

Discussion

7.	The animals which are prey have : (a) two eyes at the front (b) two eyes at the back (c) two eyes on the sides (d) one eye at the front and one on the side
Answer» The animals which are prey have : (a) two eyes at the front (b) two eyes at the back (c) two eyes on the sides (d) one eye at the front and one on the side

Discussion

8.	A ray light is incident at the glass-water interface at an angle i, it merges finally parallel to the surface of the water, then the value of μg would be
Answer» A ray light is incident at the glass-water interface at an angle $i$ , it merges finally parallel to the surface of the water, then the value of $μ_{g}$ would be

Discussion

9.	Decibel is the unit of
Answer» Decibel is the unit of

Discussion

10.	A cell of potential difference 12 V is connected to a bulb. The resistance of filament of bulb when it glows, is 24 Ω. Find the current drawn from the cell.
Answer» A cell of potential difference 12 V is connected to a bulb. The resistance of filament of bulb when it glows, is 24 $Ω$ . Find the current drawn from the cell.

Discussion

11.	The given figure shows a block and tackle system of pulleys used to lift a load. When the load is pulled up by a distance 1 m, how far does the effort end move?
Answer» The given figure shows a block and tackle system of pulleys used to lift a load. When the load is pulled up by a distance 1 m, how far does the effort end move?

11.

The given figure shows a block and tackle system of pulleys used to lift a load. When the load is pulled up by a distance 1 m, how far does the effort end move?

Answer»

The given figure shows a block and tackle system of pulleys used to lift a load. When the load is pulled up by a distance 1 m, how far does the effort end move?

Discussion

12.	What type of generator is used at Power Stations ?
Answer» What type of generator is used at Power Stations ?

Discussion

13.	If m, mn and mp are the masses of ZXA nucleus, neutron and proton respectively, then which of the following is correct?
Answer» If m, $m_{n}$ and $m_{p}$ are the masses of $_{Z} X^{A}$ nucleus, neutron and proton respectively, then which of the following is correct?

Discussion

14.	A vibrating tuning fork, held over an air column of a given length with its one end closed, produces a loud audible sound. Name the phenomenon responsible for it and explain the observation.
Answer» A vibrating tuning fork, held over an air column of a given length with its one end closed, produces a loud audible sound. Name the phenomenon responsible for it and explain the observation.

Discussion

15.	A pulley system has a velocity ratio 3 and an efficiency of 80%. Calculate the mechanical advantage of the system.
Answer» A pulley system has a velocity ratio 3 and an efficiency of 80%. Calculate the mechanical advantage of the system.

Discussion

16.	A bullet of mass ‘m′, moving with a speed ‘v′ strikes a wooden block of mass M kept at rest and gets embedded in it. The speed of this embedded block will be:
Answer» A bullet of mass $‘ m^{'}$ , moving with a speed $‘ v^{'}$ strikes a wooden block of mass $M$ kept at rest and gets embedded in it. The speed of this embedded block will be:

Discussion

17.	Calculate the electric power consumed by a copper wire, if it draws a voltage of 55 V and has a resistance of 150 Ω.
Answer» Calculate the electric power consumed by a copper wire, if it draws a voltage of $55 V$ and has a resistance of $150 Ω$ .

Discussion

18.	Which of these are practical applications of total internal reflection in our day to day life?
Answer» Which of these are practical applications of total internal reflection in our day to day life?

Discussion

19.	Which of the following devices works on the principle of electromagnetic induction?
Answer» Which of the following devices works on the principle of electromagnetic induction?

Discussion

20.	At noon the sun appears white as:
Answer» At noon the sun appears white as:

Discussion

21.	How do some animals possibly know about the earthquakes before human beings? Do bats use the same ability to hunt their prey? [3 MARKS]
Answer» How do some animals possibly know about the earthquakes before human beings? Do bats use the same ability to hunt their prey? [3 MARKS]

Discussion

22.	Work done on a body moving in a circular path is zero. Justify. [3 MARKS]
Answer» Work done on a body moving in a circular path is zero. Justify. [3 MARKS]

Discussion

23.	Onto a glass plate, a light wave is incident at an angle of 60∘. If the reflected and the refracted waves are mutually perpendicular, the refractive index of the glass is
Answer» Onto a glass plate, a light wave is incident at an angle of $60^{\circ}$ . If the reflected and the refracted waves are mutually perpendicular, the refractive index of the glass is

Discussion

24.	1. What is the focal length of a plane mirror? 2. What is the magnification of a plane mirror? 3. What is meant by the power of a lens? 4. What is one dioptre? 5. We know that plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain. [5 MARKS]
Answer» 1. What is the focal length of a plane mirror? 2. What is the magnification of a plane mirror? 3. What is meant by the power of a lens? 4. What is one dioptre? 5. We know that plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain. [5 MARKS]

Discussion

25.	Question 32 Write laws of refraction. Explain the same with the help of ray diagram, when a ray of light passes through a rectangular glass slab.
Answer» Question 32 Write laws of refraction. Explain the same with the help of ray diagram, when a ray of light passes through a rectangular glass slab.

Discussion

26.	Wavelength (λ), frequency (f) and velocity (v) of a sound wave are related as:
Answer» Wavelength ( $λ$ ), frequency $(f)$ and velocity $(v)$ of a sound wave are related as:

Discussion

27.	Mass defect (Δm) is given by?
Answer» Mass defect ( $Δ m$ ) is given by?

Discussion

28.	Can a strong laser beam destroy the mirror? If yes,the beam should reflect right.
Answer» Can a strong laser beam destroy the mirror? If yes,the beam should reflect right.

Discussion

29.	You might be familiar with the ideal gas equation from Chemistry, which relates the pressure and volume of an ideal gas with temperature as: PV = nRT, where nR is a constant. You are given a closed metal container of volume V, filled with a gas kept at a temperature T, and pressure P. If γ is the coefficient of volume expansion for the gas, what is the pressure after the temperature is increased by ΔT?
Answer» You might be familiar with the ideal gas equation from Chemistry, which relates the pressure and volume of an ideal gas with temperature as: $P V$ = $n R T$ , where $n R$ is a constant. You are given a closed metal container of volume $V$ , filled with a gas kept at a temperature $T$ , and pressure $P$ . If $γ$ is the coefficient of volume expansion for the gas, what is the pressure after the temperature is increased by $Δ T$ ?

Discussion

30.	State the kind of lever which always has the mechanical advantage less than 1.
Answer» State the kind of lever which always has the mechanical advantage less than 1.

Discussion

31.	A particle of mass 10 gm lies in a potential field V=50x2+100. The value of frequency of oscillations in Hz is
Answer» A particle of mass 10 gm lies in a potential field $V = 50 x^{2} + 100$ . The value of frequency of oscillations in Hz is

Discussion

32.	A conductor kept in a magnetic field experiences a force when current passes through it. This is the principle operation of:
Answer» A conductor kept in a magnetic field experiences a force when current passes through it. This is the principle operation of:

Discussion

33.	A resistance of 10 ohm is bent in the form of a closed circle . What is the effective resistance between the two at the ends of any diameter of this circle?
Answer» A resistance of 10 ohm is bent in the form of a closed circle . What is the effective resistance between the two at the ends of any diameter of this circle?

Discussion

34.	Question 2 Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?
Answer» Question 2 Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?

Discussion

35.	Discuss the application of cryogenics in space science.
Answer» Discuss the application of cryogenics in space science.

Discussion

36.	In an astigmatic eye, the shape of the cornea is ___. This defect is corrected using a ___ lens.
Answer» In an astigmatic eye, the shape of the cornea is ___. This defect is corrected using a ___ lens.

Discussion

37.	Find out which part of the sentence has an error: Ramesh has been working in this firma for 10 yearsb but no one hasc recognise his potentiald
Answer» Find out which part of the sentence has an error: $\frac{R a m e s h h a s b e e n w o r k i n g i n t h i s f i r m}{a} \frac{f o r 10 y e a r s}{b} \frac{b u t n o o n e h a s}{c} \frac{r e c o g n i s e h i s p o t e n t i a l}{d}$

37.

Find out which part of the sentence has an error: Ramesh has been working in this firma for 10 yearsb but no one hasc recognise his potentiald

Answer»

Find out which part of the sentence has an error:

$\frac{R a m e s h h a s b e e n w o r k i n g i n t h i s f i r m}{a} \frac{f o r 10 y e a r s}{b} \frac{b u t n o o n e h a s}{c} \frac{r e c o g n i s e h i s p o t e n t i a l}{d}$

Discussion

38.	A couple is a system of forces with
Answer» A couple is a system of forces with

Discussion

39.	Electricity is generated in power stations in Watts (W). This must be stored in a battery first before getting supplied (in solar energy, for example). So, in the battery module, why is the power stored is in the units mAh (milli-ampere hour)? How does the two unit Watts (W) and mAh are connected to each other? Also, why does the charger shows that: Input: 100-240V--2.5A 50-60 Hz and Output: 19.5V--6.7A (for example) and not the power supplied to the device's battery? (Which can, of course, be calculated by the formulae P=VI, which is both different at the input and output.
Answer» Electricity is generated in power stations in Watts (W). This must be stored in a battery first before getting supplied (in solar energy, for example). So, in the battery module, why is the power stored is in the units mAh (milli-ampere hour)? How does the two unit Watts (W) and mAh are connected to each other? Also, why does the charger shows that: Input: 100-240V--2.5A 50-60 Hz and Output: 19.5V--6.7A (for example) and not the power supplied to the device's battery? (Which can, of course, be calculated by the formulae P=VI, which is both different at the input and output.

39.

Electricity is generated in power stations in Watts (W). This must be stored in a battery first before getting supplied (in solar energy, for example). So, in the battery module, why is the power stored is in the units mAh (milli-ampere hour)? How does the two unit Watts (W) and mAh are connected to each other? Also, why does the charger shows that: Input: 100-240V--2.5A 50-60 Hz and Output: 19.5V--6.7A (for example) and not the power supplied to the device's battery? (Which can, of course, be calculated by the formulae P=VI, which is both different at the input and output.

Answer»

Electricity is generated in power stations in Watts (W). This must be stored in a battery first before getting supplied (in solar energy, for example). So, in the battery module, why is the power stored is in the units mAh (milli-ampere hour)? How does the two unit Watts (W) and mAh are connected to each other?

Also, why does the charger shows that: Input: 100-240V--2.5A 50-60 Hz and Output: 19.5V--6.7A (for example) and not the power supplied to the device's battery? (Which can, of course, be calculated by the formulae P=VI, which is both different at the input and output.

Discussion

40.	The torque due to a force of 10 N acting tangentially about a point P is 5 N m. Calculate the distance of the point of application of the force from the point P.
Answer» The torque due to a force of $10 N$ acting tangentially about a point P is $5 N m$ . Calculate the distance of the point of application of the force from the point P.

Discussion

41.	The number of electrons in an atom of an element is equal to its
Answer» The number of electrons in an atom of an element is equal to its

41.

The number of electrons in an atom of an element is equal to its

Answer»

The number of electrons in an atom of an element is equal to its

Discussion

42.	If current flowed in the circuit from A-B-C-D, then in which direction did the electron flow happen?
Answer» If current flowed in the circuit from A-B-C-D, then in which direction did the electron flow happen?

42.

If current flowed in the circuit from A-B-C-D, then in which direction did the electron flow happen?

Answer»

If current flowed in the circuit from A-B-C-D, then in which direction did the electron flow happen?

Discussion

43.	Three resistors are connected as shown in the diagram. Through the resistor 5 ohm , a current of 1 ampere is flowing. (i) What is the current through the other two resistors? (ii) What is the p.d. across AB and across AC? (iii) What is the total resistance?
Answer» Three resistors are connected as shown in the diagram. Through the resistor 5 ohm , a current of 1 ampere is flowing. (i) What is the current through the other two resistors? (ii) What is the p.d. across AB and across AC? (iii) What is the total resistance?

43.

Three resistors are connected as shown in the diagram. Through the resistor 5 ohm , a current of 1 ampere is flowing. (i) What is the current through the other two resistors? (ii) What is the p.d. across AB and across AC? (iii) What is the total resistance?

Answer»

Three resistors are connected as shown in the diagram.

Through the resistor 5 ohm , a current of 1 ampere is flowing.
(i) What is the current through the other two resistors?
(ii) What is the p.d. across AB and across AC?
(iii) What is the total resistance?

Discussion

44.	Which radiation is used for satellite communication?
Answer» Which radiation is used for satellite communication?

Discussion

45.	The image of a distant object is obtained on a screen by using a concave mirror. the focal length of the mirror can be determined by measuring the distant between A) the object and the mirror B) the object and the screen C) the mirror and the screen D) the mirror and the screen as well as the between the object and the screen
Answer» The image of a distant object is obtained on a screen by using a concave mirror. the focal length of the mirror can be determined by measuring the distant between A) the object and the mirror B) the object and the screen C) the mirror and the screen D) the mirror and the screen as well as the between the object and the screen

45.

The image of a distant object is obtained on a screen by using a concave mirror. the focal length of the mirror can be determined by measuring the distant between A) the object and the mirror B) the object and the screen C) the mirror and the screen D) the mirror and the screen as well as the between the object and the screen

Answer»

The image of a distant object is obtained on a screen by using a concave mirror. the focal length of the mirror can be determined by measuring the distant between

A) the object and the mirror

B) the object and the screen

C) the mirror and the screen

D) the mirror and the screen as well as the between the object and the screen

Discussion

46.	Choose the correct option regarding the strength of Gravitational force.
Answer» Choose the correct option regarding the strength of Gravitational force.

Discussion

47.	Ram and Shyam climbed a tree up to a same height. Ram weighs 50 kg and Shyam weighs 60 kg. Power consumed by Ram and Shyam to climb the tree are in the ratio of 3:2. What is the ratio of time taken by Ram and Shyam to climb the tree?
Answer» Ram and Shyam climbed a tree up to a same height. Ram weighs $50 k g$ and Shyam weighs $60 k g$ . Power consumed by Ram and Shyam to climb the tree are in the ratio of $3 : 2$ . What is the ratio of time taken by Ram and Shyam to climb the tree?

Discussion

48.	Why a Bulb blinks for a while when a high power rating appliance as Heater is connected to socket.
Answer» Why a Bulb blinks for a while when a high power rating appliance as Heater is connected to socket.

Discussion

49.	During a sunny day, the number plate of a car travelling on the highway seems to flicker for a person walking at a distance in the opposite direction. This happens due to
Answer» During a sunny day, the number plate of a car travelling on the highway seems to flicker for a person walking at a distance in the opposite direction. This happens due to

Discussion

50.	The correct Schrodinger wave equation for an electron with E as total energy and V as potential energy is
Answer» The correct Schrodinger wave equation for an electron with E as total energy and V as potential energy is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

When the switch S is closed in the figure given below, the pointer of the galvanometer moves to the right. If S is kept closed, will the pointer : (a) return to zero? (b) stay over on the right? (c) move to the left and stay there (d) move to and fro until S is opened

Calculate the escape velocity from the moon. The mass of the moon is 7.4×1022 kg and radius 1740 km.

Linear magnification (in) produced by a rear view mirror fitted in vehicles : (a) is equal to one (b) is less than one (c) is more than one (d) can be more or less than one depending on the position of object

For which colours of light is the refractive index of the material of a prism minimum and maximum?

If electrons are not used up in electrical appliances, what actually happens so that the appliance starts working?

Which of the following statement is correct?

The animals which are prey have : (a) two eyes at the front (b) two eyes at the back (c) two eyes on the sides (d) one eye at the front and one on the side

A ray light is incident at the glass-water interface at an angle i, it merges finally parallel to the surface of the water, then the value of μg would be

Decibel is the unit of

A cell of potential difference 12 V is connected to a bulb. The resistance of filament of bulb when it glows, is 24 Ω. Find the current drawn from the cell.

The given figure shows a block and tackle system of pulleys used to lift a load. When the load is pulled up by a distance 1 m, how far does the effort end move?

What type of generator is used at Power Stations ?

If m, mn and mp are the masses of ZXA nucleus, neutron and proton respectively, then which of the following is correct?

A vibrating tuning fork, held over an air column of a given length with its one end closed, produces a loud audible sound. Name the phenomenon responsible for it and explain the observation.

A pulley system has a velocity ratio 3 and an efficiency of 80%. Calculate the mechanical advantage of the system.

A bullet of mass ‘m′, moving with a speed ‘v′ strikes a wooden block of mass M kept at rest and gets embedded in it. The speed of this embedded block will be:

Calculate the electric power consumed by a copper wire, if it draws a voltage of 55 V and has a resistance of 150 Ω.

Which of these are practical applications of total internal reflection in our day to day life?

Which of the following devices works on the principle of electromagnetic induction?

At noon the sun appears white as:

How do some animals possibly know about the earthquakes before human beings? Do bats use the same ability to hunt their prey? [3 MARKS]

Work done on a body moving in a circular path is zero. Justify. [3 MARKS]

Onto a glass plate, a light wave is incident at an angle of 60∘. If the reflected and the refracted waves are mutually perpendicular, the refractive index of the glass is

Question 32 Write laws of refraction. Explain the same with the help of ray diagram, when a ray of light passes through a rectangular glass slab.

Wavelength (λ), frequency (f) and velocity (v) of a sound wave are related as:

Mass defect (Δm) is given by?

Can a strong laser beam destroy the mirror? If yes,the beam should reflect right.

State the kind of lever which always has the mechanical advantage less than 1.

A particle of mass 10 gm lies in a potential field V=50x2+100. The value of frequency of oscillations in Hz is

A conductor kept in a magnetic field experiences a force when current passes through it. This is the principle operation of:

A resistance of 10 ohm is bent in the form of a closed circle . What is the effective resistance between the two at the ends of any diameter of this circle?

Question 2 Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?

Discuss the application of cryogenics in space science.

In an astigmatic eye, the shape of the cornea is ___. This defect is corrected using a ___ lens.

Find out which part of the sentence has an error: Ramesh has been working in this firma for 10 yearsb but no one hasc recognise his potentiald

A couple is a system of forces with

The torque due to a force of 10 N acting tangentially about a point P is 5 N m. Calculate the distance of the point of application of the force from the point P.

The number of electrons in an atom of an element is equal to its

If current flowed in the circuit from A-B-C-D, then in which direction did the electron flow happen?

Three resistors are connected as shown in the diagram. Through the resistor 5 ohm , a current of 1 ampere is flowing. (i) What is the current through the other two resistors? (ii) What is the p.d. across AB and across AC? (iii) What is the total resistance?

Which radiation is used for satellite communication?

Choose the correct option regarding the strength of Gravitational force.

Ram and Shyam climbed a tree up to a same height. Ram weighs 50 kg and Shyam weighs 60 kg. Power consumed by Ram and Shyam to climb the tree are in the ratio of 3:2. What is the ratio of time taken by Ram and Shyam to climb the tree?

Why a Bulb blinks for a while when a high power rating appliance as Heater is connected to socket.

During a sunny day, the number plate of a car travelling on the highway seems to flicker for a person walking at a distance in the opposite direction. This happens due to

The correct Schrodinger wave equation for an electron with E as total energy and V as potential energy is

In an astigmatic eye, the shape of the cornea is _. This defect is corrected using a _ lens.