16569 + Interview Questions in Physics

1.	The atomic mass of uranium 92U238 is 238.0508 u, that of thorium 90Th234 is 234.0436 u and that of an alpha particle 2He4 is 4.0026 u. Determine the energy released when α−decay converts 92U238 into 90Th234. [1u×c2=931.5 MeV]
Answer» The atomic mass of uranium $_{92} U^{238}$ is $238.0508 u$ , that of thorium $_{90} {Th}^{234}$ is $234.0436 u$ and that of an alpha particle $_{2} {He}^{4}$ is $4.0026 u$ . Determine the energy released when $α - decay$ converts $_{92} U^{238}$ into $_{90} {Th}^{234}$ . $[1 u \times c^{2} = 931.5 MeV]$

Discussion

2.	What is the electric field due to a uniform disk on an axial point that is very very close to the disk. i.e. Radius >> Axial distance
Answer» What is the electric field due to a uniform disk on an axial point that is very very close to the disk. i.e. Radius >> Axial distance

Discussion

3.	Potential at a point is defined as bringing a unit positive charge from infinity. Why is it positive only. Not negative??
Answer» Potential at a point is defined as bringing a unit positive charge from infinity. Why is it positive only. Not negative??

Discussion

4.	21.If an object is projected from surface of Earth with speed of K times of escape speed, then interstellar speed of object will be (g=accleration due to gravity at Earth's surface, R=radius of Earth
Answer» 21.If an object is projected from surface of Earth with speed of K times of escape speed, then interstellar speed of object will be (g=accleration due to gravity at Earth's surface, R=radius of Earth

Discussion

5.	What is magnification in the below diagram? If OA = 10 cm and O’A’ = 2 cm?
Answer» What is magnification in the below diagram? If OA = 10 cm and O’A’ = 2 cm?

5.

What is magnification in the below diagram? If OA = 10 cm and O’A’ = 2 cm?

Answer»

What is magnification in the below diagram?

If OA = 10 cm and O’A’ = 2 cm?

Discussion

6.	A ball and a heavy wall are moving towards each other as shown in the figure. Assuming collision to be elastic, find the speed of the ball immediately after the collision.
Answer» A ball and a heavy wall are moving towards each other as shown in the figure. Assuming collision to be elastic, find the speed of the ball immediately after the collision.

Discussion

7.	What is the difference between centre of mass and centre of gravity?
Answer» What is the difference between centre of mass and centre of gravity?

Discussion

8.	Question 16Which of the following is not a natural resource? (a) Mango tree (b) Snake (c) Wind (d) Wooden house
Answer» Question 16 Which of the following is not a natural resource? (a) Mango tree (b) Snake (c) Wind (d) Wooden house

Discussion

9.	The most important safety method used for protecting home appliances from short circuiting or overloading is
Answer» The most important safety method used for protecting home appliances from short circuiting or overloading is

Discussion

10.	Is electric field inside conductor 0 ,only in meat(material) of conductor or inside it (hollow region) also?what will happen to electric field in hollow region if we keep a point charge (a)at center (b) at off center
Answer» Is electric field inside conductor 0 ,only in meat(material) of conductor or inside it (hollow region) also?what will happen to electric field in hollow region if we keep a point charge (a)at center (b) at off center

Discussion

11.	List down the properties of a high tension wire.
Answer» List down the properties of a high tension wire.

Discussion

12.	If the distance between the Earth and the Sun was half of its present value, what will be the approximate number of days in a year on the Earth?
Answer» If the distance between the Earth and the Sun was half of its present value, what will be the approximate number of days in a year on the Earth?

Discussion

13.	A lady uses +1.5 D glasses to have normal vision from 25 cm onwards. She uses a 20 D lens as a simple microscope to see an object. The maximum magnifying power if she uses the microscope together with her glass is (Integer only)
Answer» A lady uses $+ 1.5 D$ glasses to have normal vision from $25 cm$ onwards. She uses a $20 D$ lens as a simple microscope to see an object. The maximum magnifying power if she uses the microscope together with her glass is (Integer only)

Discussion

14.	An MCB which cuts off the electricity supply in case of short-circuiting or overloading works on the : (a) chemical effect of current (b) heating effect of current (c) magnetic effect of current (d) electroplating effect of current
Answer» An MCB which cuts off the electricity supply in case of short-circuiting or overloading works on the : (a) chemical effect of current (b) heating effect of current (c) magnetic effect of current (d) electroplating effect of current

14.

An MCB which cuts off the electricity supply in case of short-circuiting or overloading works on the : (a) chemical effect of current (b) heating effect of current (c) magnetic effect of current (d) electroplating effect of current

Answer»

An MCB which cuts off the electricity supply in case of short-circuiting or overloading works on the :

(a) chemical effect of current

(b) heating effect of current

(c) magnetic effect of current
(d) electroplating effect of current

Discussion

15.	A light ray suffers reflection and refraction at the boundary in passing from air to water. Draw a neat labelled ray diagram to show it.
Answer» A light ray suffers reflection and refraction at the boundary in passing from air to water. Draw a neat labelled ray diagram to show it.

Discussion

16.	A satellite of mass 200 kg revolves around a planet of mass 5 × 10 raised to power 30 kg in a circular orbit of radius 6.6 × 10 raised to power 6 m binding energy of satellite is
Answer» A satellite of mass 200 kg revolves around a planet of mass 5 × 10 raised to power 30 kg in a circular orbit of radius 6.6 × 10 raised to power 6 m binding energy of satellite is

Discussion

17.	two circular coins 1 and 2 are made from the same coil but radius of 1st coil is twice that of 2nd one .what is the ratio o potential difference applied across them so that magnetic field at their centers is the same? a) 3 b) 4 c) 6 d)2
Answer» two circular coins 1 and 2 are made from the same coil but radius of 1st coil is twice that of 2nd one .what is the ratio o potential difference applied across them so that magnetic field at their centers is the same? a) 3 b) 4 c) 6 d)2

Discussion

18.	A Carnot engine absorbs 6×105 cal at 227∘C. Heat rejected to the sink at 127∘C is
Answer» A Carnot engine absorbs $6 \times 10^{5} cal$ at $227^{\circ} C$ . Heat rejected to the sink at $127^{\circ} C$ is

Discussion

19.	What is a solenoid? Compare the magnetic field produced by a solenoid with the magnetic field of a bar magnet. Draw neat figures and name various components.
Answer» What is a solenoid? Compare the magnetic field produced by a solenoid with the magnetic field of a bar magnet. Draw neat figures and name various components.

Discussion

20.	Unit of pressure and thrust are ___ and ___ respectively.
Answer» Unit of pressure and thrust are ___ and ___ respectively.

Discussion

21.	Explain magnetic field around a solenoid
Answer» Explain magnetic field around a solenoid

Discussion

22.	Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is _____ (Integer answer)LiNaRbCs
Answer» Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is _____ (Integer answer) $L i N a R b C s$

Discussion

23.	Question 15In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be(a) 5 J(b) 10 J(c) 20 J(d) 30 J
Answer» Question 15 In an electrical circuit two resistors of 2 $Ω$ and 4 $Ω$ respectively are connected in series to a 6 V battery. The heat dissipated by the 4 $Ω$ resistor in 5 s will be (a) 5 J (b) 10 J (c) 20 J (d) 30 J

Discussion

24.	Due to _______ the depth of an optically denser medium appears to be _______ than its real depth.
Answer» Due to _______ the depth of an optically denser medium appears to be _______ than its real depth.

Discussion

25.	Can two wavefront cross one another? Why or why not?
Answer» Can two wavefront cross one another? Why or why not?

Discussion

26.	(a) The refractive index of diamond is 2.42. What is the meaning of this statement in relation to speed of light?(b) Describe an activity to draw a magnetic field line outside a bar magnet from one pole to another pole.
Answer» (a) The refractive index of diamond is 2.42. What is the meaning of this statement in relation to speed of light? (b) Describe an activity to draw a magnetic field line outside a bar magnet from one pole to another pole.

Discussion

27.	A 80 V-800 W heater is to be operated on a 100 V-50 Hz supply. Calculate the induc†an ce of the choke required.
Answer» A 80 V-800 W heater is to be operated on a 100 V-50 Hz supply. Calculate the induc†an ce of the choke required.

Discussion

28.	A force =(xi +2yj) N is applied on an object of mass 10 kg . Force sisplaces the object from posttion A(1,0) m to position B(3,3) then the work done by the force is (1)8J (2)5J (3)13J (4)16J
Answer» A force =(xi +2yj) N is applied on an object of mass 10 kg . Force sisplaces the object from posttion A(1,0) m to position B(3,3) then the work done by the force is (1)8J (2)5J (3)13J (4)16J

Discussion

29.	A person is standing next to a current carrying wire which lies horizontally such that he is facing the direction in which the current is flowing. The magnetic field to the person’s right is in which direction?
Answer» A person is standing next to a current carrying wire which lies horizontally such that he is facing the direction in which the current is flowing. The magnetic field to the person’s right is in which direction?

Discussion

30.	If the current passing through a heater is halved, then the heat produced by it becomes
Answer» If the current passing through a heater is halved, then the heat produced by it becomes

Discussion

31.	Calculate the power output of 92U235 reactor, if it takes 30 days to use up 2 kg of fuel, and if each fission gives 185 MeV of useable energy.(Avogadro number=6×1023)
Answer» Calculate the power output of $_{92} U^{235}$ reactor, if it takes $30$ days to use up $2 kg$ of fuel, and if each fission gives $185 MeV$ of useable energy. $(Avogadro number = 6 \times 10^{23})$

Discussion

32.	Heat required to convert one gram of ice at 0∘C into steam at 100∘C is (given Lstream = 536 cal/gm)
Answer» Heat required to convert one gram of ice at $0^{\circ} C$ into steam at $100^{\circ} C$ is (given $L_{s t r e a m}$ = 536 cal/gm)

32.

Heat required to convert one gram of ice at 0∘C into steam at 100∘C is (given Lstream = 536 cal/gm)

Answer»

Heat required to convert one gram of ice at $0^{\circ} C$ into steam at $100^{\circ} C$ is (given $L_{s t r e a m}$ = 536 cal/gm)

Discussion

33.	Bending of light when it travels from one medium to another is termed as______.
Answer» Bending of light when it travels from one medium to another is termed as______.

Discussion

34.	If two bulbs B125W and B2 100W, both rated at 200 V are connected in series across a 440 volts supply, then
Answer» If two bulbs B₁25W and B₂ 100W, both rated at 200 V are connected in series across a 440 volts supply, then

Discussion

35.	The S.I. unit of wavelength(λ) is:
Answer» The S.I. unit of wavelength(λ) is:

Discussion

36.	It is observed during an earthquake in japan that medium sized buildings are damaged more than very short or tall buildings. This is because
Answer» It is observed during an earthquake in japan that medium sized buildings are damaged more than very short or tall buildings. This is because

Discussion

37.	The potential difference (VA−VB) between the points A and B in the given figure is-
Answer» The potential difference $(V_{A} - V_{B})$ between the points $A$ and $B$ in the given figure is-

Discussion

38.	The SI unit of magnetic field intensity is______.
Answer» The SI unit of magnetic field intensity is______.

Discussion

39.	Give scientific reasons.(1) Wires carrying electricity should not be touched bare footed.(2) We should not use many electrical appliances simultaneously.(3) Alloys like alnico or nipermag are used in industry.(4) A magnetic crane is used to load and transport scrap iron.
Answer» Give scientific reasons. (1) Wires carrying electricity should not be touched bare footed. (2) We should not use many electrical appliances simultaneously. (3) Alloys like alnico or nipermag are used in industry. (4) A magnetic crane is used to load and transport scrap iron.

39.

Give scientific reasons.(1) Wires carrying electricity should not be touched bare footed.(2) We should not use many electrical appliances simultaneously.(3) Alloys like alnico or nipermag are used in industry.(4) A magnetic crane is used to load and transport scrap iron.

Answer»

Give scientific reasons.

(1) Wires carrying electricity should not be touched bare footed.

(2) We should not use many electrical appliances simultaneously.

(3) Alloys like alnico or nipermag are used in industry.

(4) A magnetic crane is used to load and transport scrap iron.

Discussion

40.	Choose the correct option in which the ionization power of alpha(α), beta(β) and gamma(γ) particles is arranged correctly.
Answer» Choose the correct option in which the ionization power of alpha(α), beta(β) and gamma(γ) particles is arranged correctly.

Discussion

41.	Pollution is not caused by
Answer» Pollution is not caused by

Discussion

42.	Explain static electricity....
Answer» Explain static electricity....

Discussion

43.	An electric geyser is connected to a three pin plug socket shown in the figure. i) Which coloured wire is connected to A ii) What will happen if A and C join together by the metal pin.
Answer» An electric geyser is connected to a three pin plug socket shown in the figure. i) Which coloured wire is connected to A ii) What will happen if A and C join together by the metal pin.

43.

An electric geyser is connected to a three pin plug socket shown in the figure. i) Which coloured wire is connected to A ii) What will happen if A and C join together by the metal pin.

Answer»

An electric geyser is connected to a three pin plug socket shown in the figure.

i) Which coloured wire is connected to A

ii) What will happen if A and C join together by the metal pin.

Discussion

44.	If phase difference between voltage (E) and current (i) is π4 and frequency, f=50 Hz. Calculate the time difference.
Answer» If phase difference between voltage $(E)$ and current $(i)$ is $\frac{π}{4}$ and frequency, $f = 50 Hz$ . Calculate the time difference.

Discussion

45.	what is a band gap?
Answer» what is a band gap?

Discussion

46.	one mol og an ideal gas at 300K is expanded isothermally from an initial vol 1L to 10L the △ E of this process is (R=2)
Answer» one mol og an ideal gas at 300K is expanded isothermally from an initial vol 1L to 10L the △ E of this process is (R=2)

Discussion

47.	In the figure, voltmeter and ammeter shown are ideal. Then voltmeter and ammeter readings, respectively, are
Answer» In the figure, voltmeter and ammeter shown are ideal. Then voltmeter and ammeter readings, respectively, are

Discussion

48.	Two identical blocks a and b each of mass 5 kg are connectedwith an ideal string and placed on a rough horizontal table of u=0.4 and third block of mass m are connected to block b with another ideal string which is pasing over a ideal pulley as given in figure. The minimum value of mass of block c such that blocks just start moving is
Answer» Two identical blocks a and b each of mass 5 kg are connectedwith an ideal string and placed on a rough horizontal table of u=0.4 and third block of mass m are connected to block b with another ideal string which is pasing over a ideal pulley as given in figure. The minimum value of mass of block c such that blocks just start moving is

Discussion

49.	In a given AC circuit through a specific branch, the current varies as a function of time given asi={i0sin2ωt, 0≤ωt<πi0sinωt, π≤ωt<2πCalculate the average current per cycle of this AC.
Answer» In a given $A C$ circuit through a specific branch, the current varies as a function of time given as $i = {\begin{matrix} i_{0} {sin}^{2} ω t, 0 \leq ω t < π i_{0} sin ω t, π \leq ω t < 2 π \end{matrix}$ Calculate the average current per cycle of this $AC$ .

Discussion

50.	Question 15Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to an electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
Answer» Question 15 Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to an electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The atomic mass of uranium 92U238 is 238.0508 u, that of thorium 90Th234 is 234.0436 u and that of an alpha particle 2He4 is 4.0026 u. Determine the energy released when α−decay converts 92U238 into 90Th234. [1u×c2=931.5 MeV]

What is the electric field due to a uniform disk on an axial point that is very very close to the disk. i.e. Radius >> Axial distance

Potential at a point is defined as bringing a unit positive charge from infinity. Why is it positive only. Not negative??

21.If an object is projected from surface of Earth with speed of K times of escape speed, then interstellar speed of object will be (g=accleration due to gravity at Earth's surface, R=radius of Earth

What is magnification in the below diagram? If OA = 10 cm and O’A’ = 2 cm?

A ball and a heavy wall are moving towards each other as shown in the figure. Assuming collision to be elastic, find the speed of the ball immediately after the collision.

What is the difference between centre of mass and centre of gravity?

Question 16Which of the following is not a natural resource? (a) Mango tree (b) Snake (c) Wind (d) Wooden house

The most important safety method used for protecting home appliances from short circuiting or overloading is

Is electric field inside conductor 0 ,only in meat(material) of conductor or inside it (hollow region) also?what will happen to electric field in hollow region if we keep a point charge (a)at center (b) at off center

List down the properties of a high tension wire.

If the distance between the Earth and the Sun was half of its present value, what will be the approximate number of days in a year on the Earth?

A lady uses +1.5 D glasses to have normal vision from 25 cm onwards. She uses a 20 D lens as a simple microscope to see an object. The maximum magnifying power if she uses the microscope together with her glass is (Integer only)

An MCB which cuts off the electricity supply in case of short-circuiting or overloading works on the : (a) chemical effect of current (b) heating effect of current (c) magnetic effect of current (d) electroplating effect of current

A light ray suffers reflection and refraction at the boundary in passing from air to water. Draw a neat labelled ray diagram to show it.

A satellite of mass 200 kg revolves around a planet of mass 5 × 10 raised to power 30 kg in a circular orbit of radius 6.6 × 10 raised to power 6 m binding energy of satellite is

two circular coins 1 and 2 are made from the same coil but radius of 1st coil is twice that of 2nd one .what is the ratio o potential difference applied across them so that magnetic field at their centers is the same? a) 3 b) 4 c) 6 d)2

A Carnot engine absorbs 6×105 cal at 227∘C. Heat rejected to the sink at 127∘C is

What is a solenoid? Compare the magnetic field produced by a solenoid with the magnetic field of a bar magnet. Draw neat figures and name various components.

Unit of pressure and thrust are ___ and ___ respectively.

Explain magnetic field around a solenoid

Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is _____ (Integer answer)LiNaRbCs

Question 15In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be(a) 5 J(b) 10 J(c) 20 J(d) 30 J

Due to _______ the depth of an optically denser medium appears to be _______ than its real depth.

Can two wavefront cross one another? Why or why not?

(a) The refractive index of diamond is 2.42. What is the meaning of this statement in relation to speed of light?(b) Describe an activity to draw a magnetic field line outside a bar magnet from one pole to another pole.

A 80 V-800 W heater is to be operated on a 100 V-50 Hz supply. Calculate the induc†an ce of the choke required.

A force =(xi +2yj) N is applied on an object of mass 10 kg . Force sisplaces the object from posttion A(1,0) m to position B(3,3) then the work done by the force is (1)8J (2)5J (3)13J (4)16J

A person is standing next to a current carrying wire which lies horizontally such that he is facing the direction in which the current is flowing. The magnetic field to the person’s right is in which direction?

If the current passing through a heater is halved, then the heat produced by it becomes

Calculate the power output of 92U235 reactor, if it takes 30 days to use up 2 kg of fuel, and if each fission gives 185 MeV of useable energy.(Avogadro number=6×1023)

Heat required to convert one gram of ice at 0∘C into steam at 100∘C is (given Lstream = 536 cal/gm)

Bending of light when it travels from one medium to another is termed as______.

If two bulbs B125W and B2 100W, both rated at 200 V are connected in series across a 440 volts supply, then

The S.I. unit of wavelength(λ) is:

It is observed during an earthquake in japan that medium sized buildings are damaged more than very short or tall buildings. This is because

The potential difference (VA−VB) between the points A and B in the given figure is-

The SI unit of magnetic field intensity is______.

Give scientific reasons.(1) Wires carrying electricity should not be touched bare footed.(2) We should not use many electrical appliances simultaneously.(3) Alloys like alnico or nipermag are used in industry.(4) A magnetic crane is used to load and transport scrap iron.

Choose the correct option in which the ionization power of alpha(α), beta(β) and gamma(γ) particles is arranged correctly.

Pollution is not caused by

Explain static electricity....

An electric geyser is connected to a three pin plug socket shown in the figure. i) Which coloured wire is connected to A ii) What will happen if A and C join together by the metal pin.

If phase difference between voltage (E) and current (i) is π4 and frequency, f=50 Hz. Calculate the time difference.

what is a band gap?

one mol og an ideal gas at 300K is expanded isothermally from an initial vol 1L to 10L the △ E of this process is (R=2)

In the figure, voltmeter and ammeter shown are ideal. Then voltmeter and ammeter readings, respectively, are

In a given AC circuit through a specific branch, the current varies as a function of time given asi={i0sin2ωt, 0≤ωt&lt;πi0sinωt, π≤ωt&lt;2πCalculate the average current per cycle of this AC.

Question 15Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to an electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

Unit of pressure and thrust are _ and _ respectively.

Due to _ the depth of an optically denser medium appears to be _ than its real depth.

In a given AC circuit through a specific branch, the current varies as a function of time given asi={i0sin2ωt, 0≤ωt<πi0sinωt, π≤ωt<2πCalculate the average current per cycle of this AC.