16569 + Interview Questions in Physics

1.	What is the importance in saying that magnetic field lines runs from north to south pole? why did we even consider the emergence of the field line from one of the poles? What is the reason we did not consider the generation of those lines with help of both the poles?
Answer» What is the importance in saying that magnetic field lines runs from north to south pole? why did we even consider the emergence of the field line from one of the poles? What is the reason we did not consider the generation of those lines with help of both the poles?

Discussion

2.	In the following diagram, Calculate the approximate current drawn from the cell.
Answer» In the following diagram, Calculate the approximate current drawn from the cell.

2.

In the following diagram, Calculate the approximate current drawn from the cell.

Answer»

In the following diagram, Calculate the approximate current drawn from the cell.

Discussion

3.	When 1 g of ice at 0°C melts to form 1 g of water at 0°C, the ice
Answer» When 1 g of ice at 0°C melts to form 1 g of water at 0°C, the ice

Discussion

4.	Two long parallel wires carrying currents 2.0 A and 4.0 A respectively in opposite directions. The separation between the wires is 0.25 m. Calculate the force per unit length between them in the order of 10−6.Also, state whether it will be attractive or repulsive.Take magnetic permeability as μ0=4π×10−7N/A2 Formula to be used, F(per unit length)=μ0I1I22πd
Answer» Two long parallel wires carrying currents 2.0 A and 4.0 A respectively in opposite directions. The separation between the wires is 0.25 m. Calculate the force per unit length between them in the order of $10^{- 6}$ .Also, state whether it will be attractive or repulsive.Take magnetic permeability as $μ_{0} = 4 π \times 10^{- 7} N / A^{2}$ Formula to be used, $F (p e r u n i t l e n g t h) = \frac{μ_{0} I_{1} I_{2}}{2 π d}$

Discussion

5.	Nuclear fission reactions are not a source of energy for one of the following. This is : (a) atom bomb (b) power plants (c) sun (d) pacemaker
Answer» Nuclear fission reactions are not a source of energy for one of the following. This is : (a) atom bomb (b) power plants (c) sun (d) pacemaker

Discussion

6.	How far should an object be placed from the pole of a converging mirror of focal length 20 cm to form a real image of the size exactly 14th the size of the object?
Answer» How far should an object be placed from the pole of a converging mirror of focal length 20 cm to form a real image of the size exactly $\frac{1}{4}$ th the size of the object?

Discussion

7.	The radiations emitted by a hot furnace are ______.
Answer» The radiations emitted by a hot furnace are ______.

Discussion

8.	A spanner (or wrench) has a long handle. Why?
Answer» A spanner (or wrench) has a long handle. Why?

Discussion

9.	Why current flows from higher potential to lower potential?
Answer» Why current flows from higher potential to lower potential?

Discussion

10.	The radius of the driving wheel of a set of gears is 18 cm. It has 100 teeth and rotates at a speed of 30 rpm. If the driven wheel rotates at a speed of 150 rpm, the Gear Ratio will be
Answer» The radius of the driving wheel of a set of gears is 18 cm. It has 100 teeth and rotates at a speed of 30 rpm. If the driven wheel rotates at a speed of 150 rpm, the Gear Ratio will be

Discussion

11.	If in a human eye parallel rays after getting refracted from the lens intersect at a point before the retina then what kind of defect is the person suffering from?
Answer» If in a human eye parallel rays after getting refracted from the lens intersect at a point before the retina then what kind of defect is the person suffering from?

Discussion

12.	As seen in case of nuclear energy some mass is getting converted into every does this conservation of mass and energy fails?
Answer» As seen in case of nuclear energy some mass is getting converted into every does this conservation of mass and energy fails?

Discussion

13.	Our teacher said that the polished side of the convex mirror should always be right side
Answer» Our teacher said that the polished side of the convex mirror should always be right side

Discussion

14.	"A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself.” Draw labeled ray diagram to justify this statement.
Answer» "A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself.” Draw labeled ray diagram to justify this statement.

Discussion

15.	In what ways can a motor be made more powerful
Answer» In what ways can a motor be made more powerful

Discussion

16.	Why do we see our image on the concave mirror when it it actually a real image and formed in front of the mirror
Answer» Why do we see our image on the concave mirror when it it actually a real image and formed in front of the mirror

Discussion

17.	How many important problems did the 'Narmada Bachao Andolan address' regarding the construction of the Sardar Sarovar dam? __
Answer» How many important problems did the 'Narmada Bachao Andolan address' regarding the construction of the Sardar Sarovar dam? __

Discussion

18.	Which of the following statement is incorrect? (a) economic development is linked to environmental conservation (b) sustainable development meets the current basic human needs and also preserves resources for future generations. (c) sustainable development does not take into consideration the viewpoints of all stakeholders (d) sustainable development is a long-planned and persistent development
Answer» Which of the following statement is incorrect? (a) economic development is linked to environmental conservation (b) sustainable development meets the current basic human needs and also preserves resources for future generations. (c) sustainable development does not take into consideration the viewpoints of all stakeholders (d) sustainable development is a long-planned and persistent development

Discussion

19.	If the object is placed at 60 cm beyond c of the concave mirror. Suddenly the object is moved towards the mirror till focus. What will happen to the magnitude of magnification?
Answer» If the object is placed at 60 cm beyond c of the concave mirror. Suddenly the object is moved towards the mirror till focus. What will happen to the magnitude of magnification?

Discussion

20.	Four students A, B, C and D did their experiment on finding the focal length of convex lens by obtaining the image of a distant object as follows: Student A used the window grill in the laboratory as the object and a white paper sheet held in hand, as the screen. Student B used a distant tree in absence of sunlight as the object, and a white thick board held on a stand, as the screen. Student C used a well illuminated laboratory window grill as the object and a white paper sheet held on a stand as the screen. Student D used a well illuminated distant tree as the object and a white thick board held on a stand, as the screen. Arrange these techniques in order of decreasing accuracy in measurement.
Answer» Four students A, B, C and D did their experiment on finding the focal length of convex lens by obtaining the image of a distant object as follows: Student A used the window grill in the laboratory as the object and a white paper sheet held in hand, as the screen. Student B used a distant tree in absence of sunlight as the object, and a white thick board held on a stand, as the screen. Student C used a well illuminated laboratory window grill as the object and a white paper sheet held on a stand as the screen. Student D used a well illuminated distant tree as the object and a white thick board held on a stand, as the screen. Arrange these techniques in order of decreasing accuracy in measurement.

20.

Four students A, B, C and D did their experiment on finding the focal length of convex lens by obtaining the image of a distant object as follows: Student A used the window grill in the laboratory as the object and a white paper sheet held in hand, as the screen. Student B used a distant tree in absence of sunlight as the object, and a white thick board held on a stand, as the screen. Student C used a well illuminated laboratory window grill as the object and a white paper sheet held on a stand as the screen. Student D used a well illuminated distant tree as the object and a white thick board held on a stand, as the screen. Arrange these techniques in order of decreasing accuracy in measurement.

Answer»

Four students A, B, C and D did their experiment on finding the focal length of convex lens by obtaining the image of a distant object as follows:
Student A used the window grill in the laboratory as the object and a white paper sheet held in hand, as the screen.
Student B used a distant tree in absence of sunlight as the object, and a white thick board held on a stand, as the screen.
Student C used a well illuminated laboratory window grill as the object and a white paper sheet held on a stand as the screen.
Student D used a well illuminated distant tree as the object and a white thick board held on a stand, as the screen.

Arrange these techniques in order of decreasing accuracy in measurement.

Discussion

21.	A body is acted upon by two forces each of magnitude F, but in opposite directions. State the effect of forces if the forces act along same line of action.
Answer» A body is acted upon by two forces each of magnitude F, but in opposite directions. State the effect of forces if the forces act along same line of action.

Discussion

22.	An inclined plane makes an angle of 300 with the horizontal. If load of 75kgf is pulled along the plane, then Calculate (i) M.A (ii) Effort used in SI units to pull the load.
Answer» An inclined plane makes an angle of 30⁰ with the horizontal. If load of 75kgf is pulled along the plane, then Calculate (i) M.A (ii) Effort used in SI units to pull the load.

Discussion

23.	A ray of light parallel to the principal axis will pass through which point in case of mirrors?
Answer» A ray of light parallel to the principal axis will pass through which point in case of mirrors?

Discussion

24.	If a person cannot see objects beyond 40 m clearly then what kind of corrective lenses he requires?
Answer» If a person cannot see objects beyond 40 m clearly then what kind of corrective lenses he requires?

Discussion

25.	The figure here shows five paths traversed by a gas on a P-V diagram. Rank the paths according to the change in internal energy of the gas, greatest first.
Answer» The figure here shows five paths traversed by a gas on a P-V diagram. Rank the paths according to the change in internal energy of the gas, greatest first.

25.

The figure here shows five paths traversed by a gas on a P-V diagram. Rank the paths according to the change in internal energy of the gas, greatest first.

Answer»

The figure here shows five paths traversed by a gas on a P-V diagram. Rank the paths according to the change in internal energy of the gas, greatest first.

Discussion

26.	How many electrons flow through an electric bulb every second of the current that passes through it is 2 ampere
Answer» How many electrons flow through an electric bulb every second of the current that passes through it is 2 ampere

Discussion

27.	Given three resistors of 2 Ω,4 Ω and 6 Ω, what will be the minimum equivalent resistance that can be obtained through their various permutations?
Answer» Given three resistors of $2 Ω, 4 Ω$ and $6 Ω$ , what will be the minimum equivalent resistance that can be obtained through their various permutations?

Discussion

28.	Satellite launch vehicles are used to place ___ in their specific orbits.
Answer» Satellite launch vehicles are used to place ___ in their specific orbits.

Discussion

29.	Electric bell works on ___ effect of electric current.
Answer» Electric bell works on ___ effect of electric current.

Discussion

30.	Which of the following is the approximate energy equivalent of the mass of an α - particle?
Answer» Which of the following is the approximate energy equivalent of the mass of an $α$ - particle?

Discussion

31.	Consider a two-particle system with the particles having masses m1 and m2. If the first particle is pushed towards the centre of mass by a distance 'd', by what distance should the second particle be moved so as to keep the centre of mass at the same position?
Answer» Consider a two-particle system with the particles having masses $m_{1}$ and $m_{2}$ . If the first particle is pushed towards the centre of mass by a distance 'd', by what distance should the second particle be moved so as to keep the centre of mass at the same position?

Discussion

32.	Noise can result in
Answer» Noise can result in

Discussion

33.	The energy consumed when 5 W power is dissipated for 2 hrs is equal to __ kJ.
Answer» The energy consumed when 5 W power is dissipated for 2 hrs is equal to __ kJ.

Discussion

34.	If on applying Cartesian sign convention for spherical lenses the image distance obtained is negative. State the significance of the negative sign.
Answer» If on applying Cartesian sign convention for spherical lenses the image distance obtained is negative. State the significance of the negative sign.

Discussion

35.	Why current flowing through each resistor in series connection equal ?
Answer» Why current flowing through each resistor in series connection equal ?

Discussion

36.	If the net force acting on a rigid body is zero it implies?
Answer» If the net force acting on a rigid body is zero it implies?

Discussion

37.	Which of the following do not use heating coil?
Answer» Which of the following do not use heating coil?

Discussion

38.	The isothermal bulk modulus of a perfect gas at normal pressure is
Answer» The isothermal bulk modulus of a perfect gas at normal pressure is

Discussion

39.	Draw a ray diagram showing how a concave mirror can be used to produce a real, inverted and diminished Image of an object.
Answer» Draw a ray diagram showing how a concave mirror can be used to produce a real, inverted and diminished Image of an object.

Discussion

40.	Why biogas is a better fuel than animal dung? Please provide explanation.
Answer» Why biogas is a better fuel than animal dung? Please provide explanation.

40.

Why biogas is a better fuel than animal dung? Please provide explanation.

Answer»

Why biogas is a better fuel than animal dung?

Please provide explanation.

Discussion

41.	A convex lens of very large focal length will make?
Answer» A convex lens of very large focal length will make?

Discussion

42.	What is resistance and resistivity? Why is the series arrangement not used for domestic circuits? Two resistors R1 and R2 are joined in series. Find the equivalent resistance. [5 MARKS]
Answer» What is resistance and resistivity? Why is the series arrangement not used for domestic circuits? Two resistors $R_{1}$ and $R_{2}$ are joined in series. Find the equivalent resistance. [5 MARKS]

Discussion

43.	When the particle of charge 10MC is brought from infinite to a point in electric field 10mJ work is done by external forces. What is the potential at that time.....??
Answer» When the particle of charge 10MC is brought from infinite to a point in electric field 10mJ work is done by external forces. What is the potential at that time.....??

Discussion

44.	A ray of light is incident on an equilateral glass prism placed in minimum deviation position. How are angle of incidence and angle of emergence related to each other in this position of the prism?
Answer» A ray of light is incident on an equilateral glass prism placed in minimum deviation position. How are angle of incidence and angle of emergence related to each other in this position of the prism?

44.

A ray of light is incident on an equilateral glass prism placed in minimum deviation position. How are angle of incidence and angle of emergence related to each other in this position of the prism?

Answer»

A ray of light is incident on an equilateral glass prism placed in minimum deviation position.

How are angle of incidence and angle of emergence related to each other in this position of the prism?

Discussion

45.	In Activity 13.7, how do we think the displacement of rod AB will be affected if (ii) a stronger horse-shoe magnet is used; and
Answer» In Activity 13.7, how do we think the displacement of rod AB will be affected if (ii) a stronger horse-shoe magnet is used; and

Discussion

46.	What forms tides in the sea?
Answer» What forms tides in the sea?

Discussion

47.	The relation between the velocity (v) of sound in a medium and the density (ρ) of the medium is given by.
Answer» The relation between the velocity (v) of sound in a medium and the density (ρ) of the medium is given by.

Discussion

48.	Electricity and magnetism are said to be inter-related to each other. A current carrying conductor has a magnetic field around it. So, when a compass is brought near to it, we can observe a deflection in the compass. Similarly, a battery is the source of the electric current. What will be the deflection, when we bring a compass near a 3 V cell (battery)?
Answer» Electricity and magnetism are said to be inter-related to each other. A current carrying conductor has a magnetic field around it. So, when a compass is brought near to it, we can observe a deflection in the compass. Similarly, a battery is the source of the electric current. What will be the deflection, when we bring a compass near a 3 V cell (battery)?

Discussion

49.	In the given figure MN and OP are semi-infinite wires and segment NO is a semi-ring. The magnetic field at C is (in T)
Answer» In the given figure MN and OP are semi-infinite wires and segment NO is a semi-ring. The magnetic field at C is (in T)

49.

In the given figure MN and OP are semi-infinite wires and segment NO is a semi-ring. The magnetic field at C is (in T)

Answer»

In the given figure MN and OP are semi-infinite wires and segment NO is a semi-ring. The magnetic field at C is (in T)

Discussion

50.	If 100 J is the energy required per second for the appliance to run. What is the power consumed, if it operates at 220V?
Answer» If 100 J is the energy required per second for the appliance to run. What is the power consumed, if it operates at 220V?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What is the importance in saying that magnetic field lines runs from north to south pole? why did we even consider the emergence of the field line from one of the poles? What is the reason we did not consider the generation of those lines with help of both the poles?

In the following diagram, Calculate the approximate current drawn from the cell.

When 1 g of ice at 0°C melts to form 1 g of water at 0°C, the ice

Nuclear fission reactions are not a source of energy for one of the following. This is : (a) atom bomb (b) power plants (c) sun (d) pacemaker

How far should an object be placed from the pole of a converging mirror of focal length 20 cm to form a real image of the size exactly 14th the size of the object?

The radiations emitted by a hot furnace are ______.

A spanner (or wrench) has a long handle. Why?

Why current flows from higher potential to lower potential?

The radius of the driving wheel of a set of gears is 18 cm. It has 100 teeth and rotates at a speed of 30 rpm. If the driven wheel rotates at a speed of 150 rpm, the Gear Ratio will be

If in a human eye parallel rays after getting refracted from the lens intersect at a point before the retina then what kind of defect is the person suffering from?

As seen in case of nuclear energy some mass is getting converted into every does this conservation of mass and energy fails?

Our teacher said that the polished side of the convex mirror should always be right side

"A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself.” Draw labeled ray diagram to justify this statement.

In what ways can a motor be made more powerful

Why do we see our image on the concave mirror when it it actually a real image and formed in front of the mirror

How many important problems did the 'Narmada Bachao Andolan address' regarding the construction of the Sardar Sarovar dam? __

If the object is placed at 60 cm beyond c of the concave mirror. Suddenly the object is moved towards the mirror till focus. What will happen to the magnitude of magnification?

A body is acted upon by two forces each of magnitude F, but in opposite directions. State the effect of forces if the forces act along same line of action.

An inclined plane makes an angle of 300 with the horizontal. If load of 75kgf is pulled along the plane, then Calculate (i) M.A (ii) Effort used in SI units to pull the load.

A ray of light parallel to the principal axis will pass through which point in case of mirrors?

If a person cannot see objects beyond 40 m clearly then what kind of corrective lenses he requires?

The figure here shows five paths traversed by a gas on a P-V diagram. Rank the paths according to the change in internal energy of the gas, greatest first.

How many electrons flow through an electric bulb every second of the current that passes through it is 2 ampere

Given three resistors of 2 Ω,4 Ω and 6 Ω, what will be the minimum equivalent resistance that can be obtained through their various permutations?

Satellite launch vehicles are used to place ___ in their specific orbits.

Electric bell works on ___ effect of electric current.

Which of the following is the approximate energy equivalent of the mass of an α - particle?

Consider a two-particle system with the particles having masses m1 and m2. If the first particle is pushed towards the centre of mass by a distance 'd', by what distance should the second particle be moved so as to keep the centre of mass at the same position?

Noise can result in

The energy consumed when 5 W power is dissipated for 2 hrs is equal to __ kJ.

If on applying Cartesian sign convention for spherical lenses the image distance obtained is negative. State the significance of the negative sign.

Why current flowing through each resistor in series connection equal ?

If the net force acting on a rigid body is zero it implies?

Which of the following do not use heating coil?

The isothermal bulk modulus of a perfect gas at normal pressure is

Draw a ray diagram showing how a concave mirror can be used to produce a real, inverted and diminished Image of an object.

Why biogas is a better fuel than animal dung? Please provide explanation.

A convex lens of very large focal length will make?

What is resistance and resistivity? Why is the series arrangement not used for domestic circuits? Two resistors R1 and R2 are joined in series. Find the equivalent resistance. [5 MARKS]

When the particle of charge 10MC is brought from infinite to a point in electric field 10mJ work is done by external forces. What is the potential at that time.....??

A ray of light is incident on an equilateral glass prism placed in minimum deviation position. How are angle of incidence and angle of emergence related to each other in this position of the prism?

In Activity 13.7, how do we think the displacement of rod AB will be affected if (ii) a stronger horse-shoe magnet is used; and

What forms tides in the sea?

The relation between the velocity (v) of sound in a medium and the density (ρ) of the medium is given by.

In the given figure MN and OP are semi-infinite wires and segment NO is a semi-ring. The magnetic field at C is (in T)

If 100 J is the energy required per second for the appliance to run. What is the power consumed, if it operates at 220V?