16569 + Interview Questions in Physics Page 17 InterviewSolution

801.	Radiochemistry deals with-
Answer» Radiochemistry deals with-

Discussion

802.	a dielectric slab is introduced between the plates of a parallel plate capacitor connected to a external battery its new voltage across will be
Answer» a dielectric slab is introduced between the plates of a parallel plate capacitor connected to a external battery its new voltage across will be

Discussion

803.	Fill in the following blank with a suitable word : When light is reflected, the angles of incidence and reflection are ___.
Answer» Fill in the following blank with a suitable word : When light is reflected, the angles of incidence and reflection are ___.

Discussion

804.	Why is the process of 'reuse' better than that of 'recycling'?
Answer» Why is the process of 'reuse' better than that of 'recycling'?

Discussion

805.	What is the range of vision of human eye?
Answer» What is the range of vision of human eye?

Discussion

806.	A machine gun of mass 50g with velocity 1000m/s. If average force acting on gun is 200N then find out the max number of bullets fired per minute.
Answer» A machine gun of mass 50g with velocity 1000m/s. If average force acting on gun is 200N then find out the max number of bullets fired per minute.

Discussion

807.	Study the information given in the box. Which mirror is described?
Answer» Study the information given in the box. Which mirror is described?

807.

Study the information given in the box. Which mirror is described?

Answer»

Study the information given in the box.

Which mirror is described?

Discussion

808.	light ray is incident at an angle of 60 degree on one face of a rectangular prism of refractive angle 90 degree.if light ray grazes second face refractive index of material of prism
Answer» light ray is incident at an angle of 60 degree on one face of a rectangular prism of refractive angle 90 degree.if light ray grazes second face refractive index of material of prism

Discussion

809.	4.How to find relative velocity of rain with respect to man if rain is already falling at an angle theta with the vertical
Answer» 4.How to find relative velocity of rain with respect to man if rain is already falling at an angle theta with the vertical

Discussion

810.	A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf as shown in the figure below by applying an effort at distance 15 cm from the fulcrum. Find the mechanical advantage of fire tongs.
Answer» A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf as shown in the figure below by applying an effort at distance 15 cm from the fulcrum. Find the mechanical advantage of fire tongs.

810.

A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf as shown in the figure below by applying an effort at distance 15 cm from the fulcrum. Find the mechanical advantage of fire tongs.

Answer»

A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf as shown in the figure below by applying an effort at distance 15 cm from the fulcrum. Find the mechanical advantage of fire tongs.

Discussion

811.	Bohr’s theory explains atomic spectrum of
Answer» Bohr’s theory explains atomic spectrum of

Discussion

812.	If the mass of a ball is 5kg on the Earth, then what would be its mass on Jupiter?
Answer» If the mass of a ball is $5 k g$ on the Earth, then what would be its mass on Jupiter?

Discussion

813.	A wire loop PQRSP have two semicircular coils of radii R1=0.5 m and R2=1 m as shown in the figure. Current I=1 A is flowing in the loop. The net magnetic induction at point C is
Answer» A wire loop $PQRSP$ have two semicircular coils of radii $R_{1} = 0.5 m$ and $R_{2} = 1 m$ as shown in the figure. Current $I = 1 A$ is flowing in the loop. The net magnetic induction at point $C$ is

Discussion

814.	A single phase, 10 kVA, 2400/240 V, 60 Hz, distribution transformer has the following characteristics:Core loss at rated voltage = 100 WCopper loss at half load = 60 WIf the transformer delivers full load at 0.8 p.f. lagging then the efficiency is ______%.95.92
Answer» A single phase, 10 kVA, 2400/240 V, 60 Hz, distribution transformer has the following characteristics: Core loss at rated voltage = 100 W Copper loss at half load = 60 W If the transformer delivers full load at 0.8 p.f. lagging then the efficiency is ______%. 95.92

Discussion

815.	A charged particle entering in a magnetic field from outside in a direction perpendicular to the field
Answer» A charged particle entering in a magnetic field from outside in a direction perpendicular to the field

Discussion

816.	A cycle wheel contains 24 spokes each of 0.5 m length. It is rotated in a horizontal plane with 120 revolution/min. In the effect of the earth's magnetic field. If the total magnetic field of the earth is 104 G, then dynamic emf across the centre and the rim of the wheel (angle of dip is 30∘) will be:-
Answer» A cycle wheel contains $24$ spokes each of $0.5 m$ length. It is rotated in a horizontal plane with $120$ revolution/min. In the effect of the earth's magnetic field. If the total magnetic field of the earth is $10^{4} G$ , then dynamic emf across the centre and the rim of the wheel (angle of dip is $30^{\circ}$ ) will be:-

Discussion

817.	how magnetic field is generated around an electron?
Answer» how magnetic field is generated around an electron?

Discussion

818.	The diagram shows a small magnet placed near a solenoid AB with its north pole N near the end A. Current is switched on in the solenoid by pressing the key K. (a) State the polarity at the ends A and B. (b) Will the magnet be attracted or repelled? Give a reason for your answer.
Answer» The diagram shows a small magnet placed near a solenoid AB with its north pole N near the end A. Current is switched on in the solenoid by pressing the key K. (a) State the polarity at the ends A and B. (b) Will the magnet be attracted or repelled? Give a reason for your answer.

818.

The diagram shows a small magnet placed near a solenoid AB with its north pole N near the end A. Current is switched on in the solenoid by pressing the key K. (a) State the polarity at the ends A and B. (b) Will the magnet be attracted or repelled? Give a reason for your answer.

Answer»

The diagram shows a small magnet placed near a solenoid AB with its north pole N near the end A. Current is switched on in the solenoid by pressing the key K.
(a) State the polarity at the ends A and B.
(b) Will the magnet be attracted or repelled? Give a reason for your answer.

Discussion

819.	Calculate the no.of atom present in 11.5liters of Hydrogen at N.T.P
Answer» Calculate the no.of atom present in 11.5liters of Hydrogen at N.T.P

Discussion

820.	A converging mirror forms a real image of height 4 cm of an object of height 1 cm placed 20 cm away from the mirror : (1) Calculate the image distance. (ii) What is the focal length of the mirror ?
Answer» A converging mirror forms a real image of height 4 cm of an object of height 1 cm placed 20 cm away from the mirror : (1) Calculate the image distance. (ii) What is the focal length of the mirror ?

Discussion

821.	Define scattering of light and dispersion.
Answer» Define scattering of light and dispersion.

Discussion

822.	The near and far points of a person are at 50 cm and 200 cm respectively. He uses a contact lens to read a book placed at 25 cm. With this lens, he can clearly see up to a maximum distance of -
Answer» The near and far points of a person are at $50 cm$ and $200 cm$ respectively. He uses a contact lens to read a book placed at $25 cm$ . With this lens, he can clearly see up to a maximum distance of -

Discussion

823.	Give scientific reasons.(a) An ordinary glass bottle cracks when boiling water is poured into it, but a borosil glass bottle does not.(b) The telephone wires which sag in summer become straight in winter.(c) Dew drops form on the grass in winter.(d) In winter, why does an iron pillar feel colder than a wooden pole ?
Answer» Give scientific reasons. (a) An ordinary glass bottle cracks when boiling water is poured into it, but a borosil glass bottle does not. (b) The telephone wires which sag in summer become straight in winter. (c) Dew drops form on the grass in winter. (d) In winter, why does an iron pillar feel colder than a wooden pole ?

Discussion

824.	What is 'star trek lemma'??
Answer» What is 'star trek lemma'??

Discussion

825.	why deliquescence is minimized in dry conditions and efflorescence is maximized in dry conditions ?
Answer» why deliquescence is minimized in dry conditions and efflorescence is maximized in dry conditions ?

Discussion

826.	19. Draw a circuit diagram to explain the ring wiring system of house wiring ? State two advantage of it?
Answer» 19. Draw a circuit diagram to explain the ring wiring system of house wiring ? State two advantage of it?

Discussion

827.	Describe the nature of image formed when the object is placed at a distance of 20 cm from a concave mirror of focal length 10 cm.
Answer» Describe the nature of image formed when the object is placed at a distance of 20 cm from a concave mirror of focal length 10 cm.

Discussion

828.	104.The refractive index of medium 2 with respect to medium 1 is
Answer» 104.The refractive index of medium 2 with respect to medium 1 is

Discussion

829.	A convex lens of focal length f produces a real image , x times the size of an object, then find the distance of the object from the lens
Answer» A convex lens of focal length f produces a real image , x times the size of an object, then find the distance of the object from the lens

Discussion

830.	A RADAR sends a signal to an aeroplane at a distance 300 km away, with a speed of 3×108 m s−1. After how much time is the signal received back after reflecting from the aeroplane?
Answer» A RADAR sends a signal to an aeroplane at a distance 300 km away, with a speed of $3 \times 10^{8} m s^{- 1}$ . After how much time is the signal received back after reflecting from the aeroplane?

Discussion

831.	A 27 mW laser beam has a cross-sectional area of 10 mm2. The magnitude of the maximum electric field in this electromagnetic wave is given by:[Given permittivity of free space ε0=9×10−12 SI units, Speed of light c=3×108 m/s]
Answer» A $27 mW$ laser beam has a cross-sectional area of $10 {mm}^{2}$ . The magnitude of the maximum electric field in this electromagnetic wave is given by: [Given permittivity of free space $ε_{0} = 9 \times 10^{- 12} SI$ units, Speed of light $c = 3 \times 10^{8} m/s$ ]

Discussion

832.	8.How to show the electric field of a charged ring with distance graphically?
Answer» 8.How to show the electric field of a charged ring with distance graphically?

Discussion

833.	The temperature coefficient of resistance of wire is 0.00125 per degree Celsius at 300 Kelvin its resistance is 1 ohm the resistance of the wire will be 2 ohm at a temperature
Answer» The temperature coefficient of resistance of wire is 0.00125 per degree Celsius at 300 Kelvin its resistance is 1 ohm the resistance of the wire will be 2 ohm at a temperature

Discussion

834.	Can you think of any other way in which you use the warmth from your breath? Fold a piece of cloth 3-4 times. Now bring it close to your mouth and blow hard on it. Did the cloth become warm? Balishtiye saw that the woodcutter was trying to cool the hot potatoes by blowing on them. What would have happened if he had eaten the potatoes without cooling them? Have you ever burnt your tongue when you ate or drank something that was too hot? How do you cool some food when it is too hot? If you were to cool these three hot things – dal, roti, rice – in which ways would you do so? Mini tried to cool her tea by blowing on it. Which do you think will be hotter – Mini’s tea or the air she blew from her mouth? Sonu was feeling very cold. He kept blowing on to his hands. Now think and write, which will be cooler – Sonu’s hands or his breath? For what other things do you blow air from your mouth?
Answer» Can you think of any other way in which you use the warmth from your breath? Fold a piece of cloth 3-4 times. Now bring it close to your mouth and blow hard on it. Did the cloth become warm? Balishtiye saw that the woodcutter was trying to cool the hot potatoes by blowing on them. What would have happened if he had eaten the potatoes without cooling them? Have you ever burnt your tongue when you ate or drank something that was too hot? How do you cool some food when it is too hot? If you were to cool these three hot things – dal, roti, rice – in which ways would you do so? Mini tried to cool her tea by blowing on it. Which do you think will be hotter – Mini’s tea or the air she blew from her mouth? Sonu was feeling very cold. He kept blowing on to his hands. Now think and write, which will be cooler – Sonu’s hands or his breath? For what other things do you blow air from your mouth?

834.

Can you think of any other way in which you use the warmth from your breath? Fold a piece of cloth 3-4 times. Now bring it close to your mouth and blow hard on it. Did the cloth become warm? Balishtiye saw that the woodcutter was trying to cool the hot potatoes by blowing on them. What would have happened if he had eaten the potatoes without cooling them? Have you ever burnt your tongue when you ate or drank something that was too hot? How do you cool some food when it is too hot? If you were to cool these three hot things – dal, roti, rice – in which ways would you do so? Mini tried to cool her tea by blowing on it. Which do you think will be hotter – Mini’s tea or the air she blew from her mouth? Sonu was feeling very cold. He kept blowing on to his hands. Now think and write, which will be cooler – Sonu’s hands or his breath? For what other things do you blow air from your mouth?

Answer»

Can you think of any other way in which you use the warmth from your breath?

Fold a piece of cloth 3-4 times. Now bring it close to your mouth and blow hard on it. Did the cloth become warm?

Balishtiye saw that the woodcutter was trying to cool the hot potatoes by blowing on them. What would have happened if he had eaten the potatoes without cooling them?

Have you ever burnt your tongue when you ate or drank something that was too hot? How do you cool some food when it is too hot?

If you were to cool these three hot things – dal, roti, rice – in which ways would you do so?

Mini tried to cool her tea by blowing on it. Which do you think will be hotter – Mini’s tea or the air she blew from her mouth?

Sonu was feeling very cold. He kept blowing on to his hands. Now think and write, which will be cooler – Sonu’s hands or his breath?

For what other things do you blow air from your mouth?

Discussion

835.	To find the equivalent resistance of two resistors connected in series, the connection of ammeter is correct in the circuit: (a) Circuit A (b) Circuit B (c) Both the circuits (d) Neither of the two circuits.
Answer» To find the equivalent resistance of two resistors connected in series, the connection of ammeter is correct in the circuit: (a) Circuit A (b) Circuit B (c) Both the circuits (d) Neither of the two circuits.

Discussion

836.	Same amount of heat is supplied to same masses of two substances A and B of specific heat capacities c1 and c2 such that c1 < c2. Which of the 2 will show a higher rise in temperature?
Answer» Same amount of heat is supplied to same masses of two substances A and B of specific heat capacities c₁ and c₂ such that c₁ < c₂. Which of the 2 will show a higher rise in temperature?

Discussion

837.	What is the orientation of a current carrying conductor relative to the direction of magnetic field for(a) Maximum magnetic force. (b) Minimum magnetic force [2 MARKS]
Answer» What is the orientation of a current carrying conductor relative to the direction of magnetic field for (a) Maximum magnetic force. (b) Minimum magnetic force [2 MARKS]

Discussion

838.	Find the value of ‘I′ for the following circuit.
Answer» Find the value of $‘ I^{'}$ for the following circuit.

Discussion

839.	A force of 2 kgf is applied on a body of mass 98 kg. Calculate the acceleration of the body. [ g = 9.8 m/s2 = 980 cm/s2]
Answer» A force of 2 kgf is applied on a body of mass 98 kg. Calculate the acceleration of the body. [ g = 9.8 m/s² = 980 cm/s²]

Discussion

840.	When we enter in a dark room from a bright area, our vision is impaired for few seconds. Why does this happen?
Answer» When we enter in a dark room from a bright area, our vision is impaired for few seconds. Why does this happen?

Discussion

841.	87. How to find field of a given dipole in coordinate sym
Answer» 87. How to find field of a given dipole in coordinate sym

Discussion

842.	A torch bulb is rated 2.5V and 750mA. Calculate: a) it's power b) it's resistance c) then energy consumed if this bulb is lighted for 4 hours
Answer» A torch bulb is rated 2.5V and 750mA. Calculate: a) it's power b) it's resistance c) then energy consumed if this bulb is lighted for 4 hours

Discussion

843.	Question 10 Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset? a) Dispersion of light b) Scattering of light c) Total internal reflection of light d) Reflection of light from the earth
Answer» Question 10 Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset? a) Dispersion of light b) Scattering of light c) Total internal reflection of light d) Reflection of light from the earth

843.

Question 10 Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset? a) Dispersion of light b) Scattering of light c) Total internal reflection of light d) Reflection of light from the earth

Answer»

Question 10
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

a) Dispersion of light

b) Scattering of light

c) Total internal reflection of light

d) Reflection of light from the earth

Discussion

844.	What is the average level of loudness permitted for commercial firecrackers in dB?125
Answer» What is the average level of loudness permitted for commercial firecrackers in $dB$ ? 125

Discussion

845.	Which of the following vehicles is least energy consuming?
Answer» Which of the following vehicles is least energy consuming?

Discussion

846.	What is Permeability
Answer» What is Permeability

Discussion

847.	WHAT IS EMMERSON EFFECT??
Answer» WHAT IS EMMERSON EFFECT??

Discussion

848.	The Bohr's orbit radius for the hydrogen atom (n=1) is 0.530 A. The radius of the first excited state (n=2) orbit is
Answer» The Bohr's orbit radius for the hydrogen atom (n=1) is 0.530 A. The radius of the first excited state (n=2) orbit is

Discussion

849.	What is the specific charge of alpha Particle
Answer» What is the specific charge of alpha Particle

Discussion

850.	Two resistors, with resistance 5Ω and 10Ω respectively are to be connected to a battery of emf 6 V so as to obtain: (a) minimum current flowing (b) maximum current flowing (c) How will you connect the resistances in each case? (d) Calculate the strength of the total current in the circuit in the two cases.
Answer» Two resistors, with resistance $5 Ω$ and $10 Ω$ respectively are to be connected to a battery of emf 6 V so as to obtain: (a) minimum current flowing (b) maximum current flowing (c) How will you connect the resistances in each case? (d) Calculate the strength of the total current in the circuit in the two cases.

Discussion

Explore topic-wise InterviewSolutions in .

Radiochemistry deals with-

a dielectric slab is introduced between the plates of a parallel plate capacitor connected to a external battery its new voltage across will be

Fill in the following blank with a suitable word : When light is reflected, the angles of incidence and reflection are ___.

Why is the process of 'reuse' better than that of 'recycling'?

What is the range of vision of human eye?

A machine gun of mass 50g with velocity 1000m/s. If average force acting on gun is 200N then find out the max number of bullets fired per minute.

Study the information given in the box. Which mirror is described?

light ray is incident at an angle of 60 degree on one face of a rectangular prism of refractive angle 90 degree.if light ray grazes second face refractive index of material of prism

4.How to find relative velocity of rain with respect to man if rain is already falling at an angle theta with the vertical

A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf as shown in the figure below by applying an effort at distance 15 cm from the fulcrum. Find the mechanical advantage of fire tongs.

Bohr’s theory explains atomic spectrum of

If the mass of a ball is 5kg on the Earth, then what would be its mass on Jupiter?

A wire loop PQRSP have two semicircular coils of radii R1=0.5 m and R2=1 m as shown in the figure. Current I=1 A is flowing in the loop. The net magnetic induction at point C is

A single phase, 10 kVA, 2400/240 V, 60 Hz, distribution transformer has the following characteristics:Core loss at rated voltage = 100 WCopper loss at half load = 60 WIf the transformer delivers full load at 0.8 p.f. lagging then the efficiency is ______%.95.92

A charged particle entering in a magnetic field from outside in a direction perpendicular to the field

how magnetic field is generated around an electron?

The diagram shows a small magnet placed near a solenoid AB with its north pole N near the end A. Current is switched on in the solenoid by pressing the key K. (a) State the polarity at the ends A and B. (b) Will the magnet be attracted or repelled? Give a reason for your answer.

Calculate the no.of atom present in 11.5liters of Hydrogen at N.T.P

A converging mirror forms a real image of height 4 cm of an object of height 1 cm placed 20 cm away from the mirror : (1) Calculate the image distance. (ii) What is the focal length of the mirror ?

Define scattering of light and dispersion.

The near and far points of a person are at 50 cm and 200 cm respectively. He uses a contact lens to read a book placed at 25 cm. With this lens, he can clearly see up to a maximum distance of -

What is 'star trek lemma'??

why deliquescence is minimized in dry conditions and efflorescence is maximized in dry conditions ?

19. Draw a circuit diagram to explain the ring wiring system of house wiring ? State two advantage of it?

Describe the nature of image formed when the object is placed at a distance of 20 cm from a concave mirror of focal length 10 cm.

104.The refractive index of medium 2 with respect to medium 1 is

A convex lens of focal length f produces a real image , x times the size of an object, then find the distance of the object from the lens

A RADAR sends a signal to an aeroplane at a distance 300 km away, with a speed of 3×108 m s−1. After how much time is the signal received back after reflecting from the aeroplane?

A 27 mW laser beam has a cross-sectional area of 10 mm2. The magnitude of the maximum electric field in this electromagnetic wave is given by:[Given permittivity of free space ε0=9×10−12 SI units, Speed of light c=3×108 m/s]

8.How to show the electric field of a charged ring with distance graphically?

The temperature coefficient of resistance of wire is 0.00125 per degree Celsius at 300 Kelvin its resistance is 1 ohm the resistance of the wire will be 2 ohm at a temperature

To find the equivalent resistance of two resistors connected in series, the connection of ammeter is correct in the circuit: (a) Circuit A (b) Circuit B (c) Both the circuits (d) Neither of the two circuits.

Same amount of heat is supplied to same masses of two substances A and B of specific heat capacities c1 and c2 such that c1 &lt; c2. Which of the 2 will show a higher rise in temperature?

What is the orientation of a current carrying conductor relative to the direction of magnetic field for(a) Maximum magnetic force. (b) Minimum magnetic force [2 MARKS]

Find the value of ‘I′ for the following circuit.

A force of 2 kgf is applied on a body of mass 98 kg. Calculate the acceleration of the body. [ g = 9.8 m/s2 = 980 cm/s2]

When we enter in a dark room from a bright area, our vision is impaired for few seconds. Why does this happen?

87. How to find field of a given dipole in coordinate sym

A torch bulb is rated 2.5V and 750mA. Calculate: a) it's power b) it's resistance c) then energy consumed if this bulb is lighted for 4 hours

Question 10 Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset? a) Dispersion of light b) Scattering of light c) Total internal reflection of light d) Reflection of light from the earth

What is the average level of loudness permitted for commercial firecrackers in dB?125

Which of the following vehicles is least energy consuming?

What is Permeability

WHAT IS EMMERSON EFFECT??

The Bohr's orbit radius for the hydrogen atom (n=1) is 0.530 A. The radius of the first excited state (n=2) orbit is

What is the specific charge of alpha Particle

Same amount of heat is supplied to same masses of two substances A and B of specific heat capacities c1 and c2 such that c1 < c2. Which of the 2 will show a higher rise in temperature?