9478 + Interview Questions in Physics Page 18 InterviewSolution

851.	if f(x^3 + 1)=x^4 + 1, find f(x)
Answer» if f(x^3 + 1)=x^4 + 1, find f(x)

Discussion

852.	A semiconductor becomes an insulator at
Answer» A semiconductor becomes an insulator at

Discussion

853.	A car is moving at a speed of 50km/hr. which state is it in. __
Answer» A car is moving at a speed of 50km/hr. which state is it in. __

Discussion

854.	A body is said to be at rest if it does not change its ___________with respect to a reference point.
Answer» A body is said to be at rest if it does not change its ___________with respect to a reference point.

Discussion

855.	Current is the flow of positively charged fluid 1. True 2. False
Answer» Current is the flow of positively charged fluid 1. True 2. False

Discussion

856.	Two forces 6 N and 4 N are acting in the opposite direction as shown in the figure. The mass of the object is 2kg. What is the acceleration of the mass?
Answer» Two forces 6 N and 4 N are acting in the opposite direction as shown in the figure. The mass of the object is 2kg. What is the acceleration of the mass?

856.

Two forces 6 N and 4 N are acting in the opposite direction as shown in the figure. The mass of the object is 2kg. What is the acceleration of the mass?

Answer»

Two forces 6 N and 4 N are acting in the opposite direction as shown in the figure. The mass of the object is 2kg. What is the acceleration of the mass?

Discussion

857.	Story of lightning or how does the lightning form ?
Answer» Story of lightning or how does the lightning form ?

Discussion

858.	(a) What is 'blind spot' in the eye? (b) What is night blindness? What causes night blindness?
Answer» (a) What is 'blind spot' in the eye? (b) What is night blindness? What causes night blindness?

858.

(a) What is 'blind spot' in the eye? (b) What is night blindness? What causes night blindness?

Answer»

(a) What is 'blind spot' in the eye?

(b) What is night blindness? What causes night blindness?

Discussion

859.	The dis†an ce of two planets from the sun are 10^{13 }m and 10^{12 }m respectively ,The ratio of time periods of the planet will be ;
Answer» The dis†an ce of two planets from the sun are 10^{13 }m and 10^{12 }m respectively ,The ratio of time periods of the planet will be ;

Discussion

860.	A light ray is incident at 30∘ on one of the two mirrors that are placed at right angle to each other. Find the angle of reflection for the ray reflected from mirror B.
Answer» A light ray is incident at $30^{\circ}$ on one of the two mirrors that are placed at right angle to each other. Find the angle of reflection for the ray reflected from mirror B.

Discussion

861.	The earth is currently moving around the sun all the object present on the earth are also moving then why we says that the object is at rest.
Answer» The earth is currently moving around the sun all the object present on the earth are also moving then why we says that the object is at rest.

Discussion

862.	For a particle thrown up draw position time graph considering air friction ispresent.
Answer» For a particle thrown up draw position time graph considering air friction ispresent.

Discussion

863.	The dimensional formula for the torque is
Answer» The dimensional formula for the torque is

Discussion

864.	Why is electric flux through ring same as that of electric flux through disc?
Answer» Why is electric flux through ring same as that of electric flux through disc?

Discussion

865.	The magnitude of zero error of the spring balance and least count of the measuring cylinder, shown here, are, respectively :(1) 2.5g and 0.1 mL(2) 5.0g and 0.1 mL(3) 2.5g and 0.2 mL(4) 5.0g and 0.2 mL
Answer» The magnitude of zero error of the spring balance and least count of the measuring cylinder, shown here, are, respectively : (1) 2.5g and 0.1 mL (2) 5.0g and 0.1 mL (3) 2.5g and 0.2 mL (4) 5.0g and 0.2 mL

Discussion

866.	Which of the following correctly shows the force acting between two positive charges?
Answer» Which of the following correctly shows the force acting between two positive charges?

Discussion

867.	The pressure exerted by a liquid at depth h is ____. (All terms have their standard meanings)
Answer» The pressure exerted by a liquid at depth $h$ is ____. (All terms have their standard meanings)

Discussion

868.	A block of mass M is placed on a smooth inclined plane of inclination x^° with the horizontal the force exerted by the plan on the block has a magnitude
Answer» A block of mass M is placed on a smooth inclined plane of inclination x^° with the horizontal the force exerted by the plan on the block has a magnitude

Discussion

869.	The force required to overcome friction at the instant an object starts moving from rest is a measure of
Answer» The force required to overcome friction at the instant an object starts moving from rest is a measure of

Discussion

870.	What is the reason for the heat being produced when we rub our hands?
Answer» What is the reason for the heat being produced when we rub our hands?

Discussion

871.	67.The plot given above represents the velocity of a particle (in m/s) with time (in seconds). Assuming that the plot represents a semi-circle, distance traversed by the particle at the end of 7 seconds is approximately.
Answer» 67.The plot given above represents the velocity of a particle (in m/s) with time (in seconds). Assuming that the plot represents a semi-circle, distance traversed by the particle at the end of 7 seconds is approximately.

Discussion

872.	83. what is normal light ray?what is magnification?
Answer» 83. what is normal light ray?what is magnification?

Discussion

873.	When travelling obliquely from one medium to another medium, the direction of light rays in the second medium ___.
Answer» When travelling obliquely from one medium to another medium, the direction of light rays in the second medium ___.

Discussion

874.	Convert 37∘C to Fahrenhiet scale.
Answer» Convert $37^{\circ} C$ to Fahrenhiet scale.

Discussion

875.	let's find,by what magnitude is(\surd25+\surd81) more than(\surd16+(\surd36)
Answer» let's find,by what magnitude is(\surd25+\surd81) more than(\surd16+(\surd36)

Discussion

876.	Calculate the amount of heat reqiured to convert 1 kg of ice at −10∘C into steam at 100∘C. Specific heat capacity of ice is=2100 Jkg−1K−1, latent heat of fusion of ice =3.36×105 Jkg−1, specific heat capacity of water =4200 Jkg−1K−1 and latent heat of vapourization of water=2.25×106 Jkg−1.
Answer» Calculate the amount of heat reqiured to convert $1 kg$ of ice at $- 10^{\circ} C$ into steam at $100^{\circ} C$ . Specific heat capacity of ice is $= 2100 J {k g}^{- 1} K^{- 1}$ , latent heat of fusion of ice $= 3.36 \times 10^{5} J {k g}^{- 1}$ , specific heat capacity of water $= 4200 J {k g}^{- 1} K^{- 1}$ and latent heat of vapourization of water $= 2.25 \times 10^{6} J {k g}^{- 1}$ .

Discussion

877.	Does metallic hydrides conduct electricity in solid form?
Answer» Does metallic hydrides conduct electricity in solid form?

Discussion

878.	Is a shooting star actually a star? Explain.
Answer» Is a shooting star actually a star? Explain.

Discussion

879.	Question 51Answer True/False.t minutes are equal to 60t seconds.
Answer» Question 51 Answer True/False. $t$ minutes are equal to 60 $t$ seconds.

879.

Question 51Answer True/False.t minutes are equal to 60t seconds.

Answer»

Question 51

Answer True/False.

$t$ minutes are equal to 60 $t$ seconds.

Discussion

880.	Among the following which is an example of a transverse wave?
Answer» Among the following which is an example of a transverse wave?

Discussion

881.	Why first ionization energy if sodium is less then magnesium?
Answer» Why first ionization energy if sodium is less then magnesium?

Discussion

882.	Question 7In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.
Answer» Question 7 In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.

Discussion

883.	42. How many electrons in an atom with atomic no 105 can have (n+l)=8
Answer» 42. How many electrons in an atom with atomic no 105 can have (n+l)=8

Discussion

884.	According to the convention direction of flow of electric current is taken from positive terminal to negative terminal of battery, which is opposite to the flow of ___.
Answer» According to the convention direction of flow of electric current is taken from positive terminal to negative terminal of battery, which is opposite to the flow of ___.

Discussion

885.	Question 18The handle of a cricket bat or a badminton racquet is usually rough. Explain the reason.
Answer» Question 18 The handle of a cricket bat or a badminton racquet is usually rough. Explain the reason.

Discussion

886.	Which one of the following statement is true for an ideal machine?
Answer» Which one of the following statement is true for an ideal machine?

Discussion

887.	In transverse waves, particles move in:
Answer» In transverse waves, particles move in:

Discussion

888.	The sound from a honey bee is produced when it vibrates its wings at an average rate of 400 vibrations per second.What is the time period of the vibration in milliseconds?
Answer» The sound from a honey bee is produced when it vibrates its wings at an average rate of 400 vibrations per second. What is the time period of the vibration in milliseconds?

Discussion

889.	Due to a point isotropic sonic source, loudness at a point is L = 60 dB. If density of air is ρ=(1511)kg/m3 and velocity of sound in air is v = 330 m/s, the pressure oscillation amplitude at the point of observation is [I0=10−12 W/m2]
Answer» Due to a point isotropic sonic source, loudness at a point is L = 60 dB. If density of air is $ρ = (\frac{15}{11}) k g / m^{3}$ and velocity of sound in air is v = 330 m/s, the pressure oscillation amplitude at the point of observation is $[I_{0} = 10^{- 12} W / m^{2}]$

Discussion

890.	A student determines the focal length of a device X, by focussing the image of a far off object on the screen positioned as shown in the figure alongside.The device X is a :(1) Convex lens(2) Concave lens(3) Convex mirror(4) Concave mirror
Answer» A student determines the focal length of a device X, by focussing the image of a far off object on the screen positioned as shown in the figure alongside. The device X is a : (1) Convex lens (2) Concave lens (3) Convex mirror (4) Concave mirror

Discussion

891.	Question 19Two astronauts are floating close to each other in space. Can they talk to each other without using any special device? Give reasons.
Answer» Question 19 Two astronauts are floating close to each other in space. Can they talk to each other without using any special device? Give reasons.

Discussion

892.	22. How one mole of O2 is equal to 2 moles of O
Answer» 22. How one mole of O2 is equal to 2 moles of O

Discussion

893.	34.What is grothus conductance.Explain in detail
Answer» 34.What is grothus conductance.Explain in detail

Discussion

894.	A direct current of 5 A and an alternating current of peak value 5 A flows through resistances 1Ω and 2Ω respectively. Find the ratio of heat produced in the two resistances in the same interval.
Answer» A direct current of $5 A$ and an alternating current of peak value $5 A$ flows through resistances $1 Ω$ and $2 Ω$ respectively. Find the ratio of heat produced in the two resistances in the same interval.

Discussion

895.	50g of copper is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 10g of water, then what would be the rise in its temperature? (specific heat of copper =420J/kg/∘C, specific heat of water =4200J/kg/∘C)
Answer» $50 g$ of copper is heated to increase its temperature by $10^{\circ} C$ . If the same quantity of heat is given to $10 g$ of water, then what would be the rise in its temperature? (specific heat of copper $= 420 J / k g /^{\circ} C$ , specific heat of water $= 4200 J / k g /^{\circ} C$ )

Discussion

896.	Is lightning an electrostatic force?why?
Answer» Is lightning an electrostatic force?why?

Discussion

897.	How can we increase friction?
Answer» How can we increase friction?

Discussion

898.	Name two foods each rich in:i) Vitamin Aii) Vitamin Biii) Vitamin Civ) Vitamin D
Answer» Name two foods each rich in: i) Vitamin A ii) Vitamin B iii) Vitamin C iv) Vitamin D

Discussion

899.	Whaita is the velocity of light in a diamond if the refractive index of diamond with respect to vacuum is 2.5?
Answer» Whaita is the velocity of light in a diamond if the refractive index of diamond with respect to vacuum is $2.5$ ?

Discussion

900.	A 100 W electric bulb was switched on in a 2.5 m×3 m×3 m size thermally insulated room having a temperature of 20 ∘C. The room temperature at the end of 24 hours will be (Assume, air to be ideal in nature)[Data required: specific heat of air at constant volume cv=0.717 kJ/kgK and density of air, ρ=1.2 kg/m3]
Answer» A $100 W$ electric bulb was switched on in a $2.5 m \times 3 m \times 3 m$ size thermally insulated room having a temperature of $20^{\circ} C$ . The room temperature at the end of $24 hours$ will be (Assume, air to be ideal in nature) [Data required: specific heat of air at constant volume $c_{v} = 0.717 kJ/kgK$ and density of air, $ρ = 1.2 {kg/m}^{3}$ ]

Discussion

Explore topic-wise InterviewSolutions in .

if f(x^3 + 1)=x^4 + 1, find f(x)

A semiconductor becomes an insulator at

A car is moving at a speed of 50km/hr. which state is it in. __

A body is said to be at rest if it does not change its ___________with respect to a reference point.

Current is the flow of positively charged fluid 1. True 2. False

Two forces 6 N and 4 N are acting in the opposite direction as shown in the figure. The mass of the object is 2kg. What is the acceleration of the mass?

Story of lightning or how does the lightning form ?

(a) What is 'blind spot' in the eye? (b) What is night blindness? What causes night blindness?

The dis†an ce of two planets from the sun are 10^{13 }m and 10^{12 }m respectively ,The ratio of time periods of the planet will be ;

A light ray is incident at 30∘ on one of the two mirrors that are placed at right angle to each other. Find the angle of reflection for the ray reflected from mirror B.

The earth is currently moving around the sun all the object present on the earth are also moving then why we says that the object is at rest.

For a particle thrown up draw position time graph considering air friction ispresent.

The dimensional formula for the torque is

Why is electric flux through ring same as that of electric flux through disc?

The magnitude of zero error of the spring balance and least count of the measuring cylinder, shown here, are, respectively :(1) 2.5g and 0.1 mL(2) 5.0g and 0.1 mL(3) 2.5g and 0.2 mL(4) 5.0g and 0.2 mL

Which of the following correctly shows the force acting between two positive charges?

The pressure exerted by a liquid at depth h is ____. (All terms have their standard meanings)

A block of mass M is placed on a smooth inclined plane of inclination x^° with the horizontal the force exerted by the plan on the block has a magnitude

The force required to overcome friction at the instant an object starts moving from rest is a measure of

What is the reason for the heat being produced when we rub our hands?

67.The plot given above represents the velocity of a particle (in m/s) with time (in seconds). Assuming that the plot represents a semi-circle, distance traversed by the particle at the end of 7 seconds is approximately.

83. what is normal light ray?what is magnification?

When travelling obliquely from one medium to another medium, the direction of light rays in the second medium ___.

Convert 37∘C to Fahrenhiet scale.

let's find,by what magnitude is(\surd25+\surd81) more than(\surd16+(\surd36)

Does metallic hydrides conduct electricity in solid form?

Is a shooting star actually a star? Explain.

Question 51Answer True/False.t minutes are equal to 60t seconds.

Among the following which is an example of a transverse wave?

Why first ionization energy if sodium is less then magnesium?

Question 7In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.

42. How many electrons in an atom with atomic no 105 can have (n+l)=8

According to the convention direction of flow of electric current is taken from positive terminal to negative terminal of battery, which is opposite to the flow of ___.

Question 18The handle of a cricket bat or a badminton racquet is usually rough. Explain the reason.

Which one of the following statement is true for an ideal machine?

In transverse waves, particles move in:

The sound from a honey bee is produced when it vibrates its wings at an average rate of 400 vibrations per second.What is the time period of the vibration in milliseconds?

Due to a point isotropic sonic source, loudness at a point is L = 60 dB. If density of air is ρ=(1511)kg/m3 and velocity of sound in air is v = 330 m/s, the pressure oscillation amplitude at the point of observation is [I0=10−12 W/m2]

A student determines the focal length of a device X, by focussing the image of a far off object on the screen positioned as shown in the figure alongside.The device X is a :(1) Convex lens(2) Concave lens(3) Convex mirror(4) Concave mirror

Question 19Two astronauts are floating close to each other in space. Can they talk to each other without using any special device? Give reasons.

22. How one mole of O2 is equal to 2 moles of O

34.What is grothus conductance.Explain in detail

A direct current of 5 A and an alternating current of peak value 5 A flows through resistances 1Ω and 2Ω respectively. Find the ratio of heat produced in the two resistances in the same interval.

50g of copper is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 10g of water, then what would be the rise in its temperature? (specific heat of copper =420J/kg/∘C, specific heat of water =4200J/kg/∘C)

Is lightning an electrostatic force?why?

How can we increase friction?

Name two foods each rich in:i) Vitamin Aii) Vitamin Biii) Vitamin Civ) Vitamin D

Whaita is the velocity of light in a diamond if the refractive index of diamond with respect to vacuum is 2.5?