16569 + Interview Questions in Physics Page 329 InterviewSolution

16401.	Two spheres have masses in the ratio 2:3 but have same gravitational PE. Calculate the ratio of their heights & weights.
Answer» Two spheres have masses in the ratio 2:3 but have same gravitational PE. Calculate the ratio of their heights & weights.

Discussion

16402.	A ray of light passes through a right-angled prism as shown in the given figure. The angle of incidence at the faces AC and BC are:
Answer» A ray of light passes through a right-angled prism as shown in the given figure. The angle of incidence at the faces AC and BC are:

16402.

A ray of light passes through a right-angled prism as shown in the given figure. The angle of incidence at the faces AC and BC are:

Answer»

A ray of light passes through a right-angled prism as shown in the given figure. The angle of incidence at the faces AC and BC are:

Discussion

16403.	The objective lens of microscope use
Answer» The objective lens of microscope use

Discussion

16404.	State the difference in colors of the sun observed during sunrise/sunset and noon. Give explanation for each.
Answer» State the difference in colors of the sun observed during sunrise/sunset and noon. Give explanation for each.

Discussion

16405.	(a) Derive the expression for the heat produced due to a current I flowing for a time interval t through a resistor R having a potential difference V across its ends. With which name is this relation known? (b) How much heat will an instrument of 12 W produce in one minute if it is connected to a battery of 12 V? (c) The current passing through a room heater has been halved. What will happen to the heat produced by it? (d) What is meant by the heating effect of current? Give two applications of the heating effect of current. (e) Name the material which is used for making the filaments of an electric bulb.
Answer» (a) Derive the expression for the heat produced due to a current I flowing for a time interval t through a resistor R having a potential difference V across its ends. With which name is this relation known? (b) How much heat will an instrument of 12 W produce in one minute if it is connected to a battery of 12 V? (c) The current passing through a room heater has been halved. What will happen to the heat produced by it? (d) What is meant by the heating effect of current? Give two applications of the heating effect of current. (e) Name the material which is used for making the filaments of an electric bulb.

Discussion

16406.	How is heat capacity of a body related to specific heat capacity of its substance?
Answer» How is heat capacity of a body related to specific heat capacity of its substance?

Discussion

16407.	A wire of length l is bent in the form of a circular loop and is suspended in a region of a uniform magnetic field . When a steady current I is passed through the loop, the maximum torque experienced by it is
Answer» A wire of length l is bent in the form of a circular loop and is suspended in a region of a uniform magnetic field . When a steady current I is passed through the loop, the maximum torque experienced by it is

Discussion

16408.	Two rods, one of aluminium and the other made of steel, having initial lengths l1 and l2 are connected together to form a single rod of length 3 cm. If the length of each rod increases by the same amount when the temperature is raised by a certain value, and if 22×10−6 ∘C−1 and 11×10−6 ∘C−1 are the coefficients of linear expansion of aluminium and steel, then:
Answer» Two rods, one of aluminium and the other made of steel, having initial lengths $l_{1}$ and $l_{2}$ are connected together to form a single rod of length $3 cm$ . If the length of each rod increases by the same amount when the temperature is raised by a certain value, and if $22 \times 10^{- 6}^{\circ} C^{- 1}$ and $11 \times 10^{- 6}^{\circ} C^{- 1}$ are the coefficients of linear expansion of aluminium and steel, then:

Discussion

16409.	A hypothetical planet has density r, radius R and surface gravitational acceleration g. If the radius of the planet were doubled, but the planetary density stayed the same, the acceleration due to gravity at the planet’s surface would be:
Answer» A hypothetical planet has density r, radius R and surface gravitational acceleration g. If the radius of the planet were doubled, but the planetary density stayed the same, the acceleration due to gravity at the planet’s surface would be:

Discussion

16410.	The steps for the nuclear fission are shown using the Liquid drop model. Which of these is the correct sequence?
Answer» The steps for the nuclear fission are shown using the Liquid drop model. Which of these is the correct sequence?

Discussion

16411.	Match the following : Column A Column B (a) White light (i) Convex mirror (b) Refraction (ii) concave mirror (c) Virtual images (iii) refraction (d) Real images (iv) spectrum (e) Prism (v) ray of light from glass to air Ans. (a) - (iv), (b)-(v), (c)-(i), (d)-(ii), (e)-(iii)
Answer» Match the following : Column A Column B (a) White light (i) Convex mirror (b) Refraction (ii) concave mirror (c) Virtual images (iii) refraction (d) Real images (iv) spectrum (e) Prism (v) ray of light from glass to air Ans. (a) - (iv), (b)-(v), (c)-(i), (d)-(ii), (e)-(iii)

16411.

Match the following : Column A Column B (a) White light (i) Convex mirror (b) Refraction (ii) concave mirror (c) Virtual images (iii) refraction (d) Real images (iv) spectrum (e) Prism (v) ray of light from glass to air Ans. (a) - (iv), (b)-(v), (c)-(i), (d)-(ii), (e)-(iii)

Answer»

Match the following :

Column A Column B

(a) White light (i) Convex mirror

(b) Refraction (ii) concave mirror

(c) Virtual images (iii) refraction

(d) Real images (iv) spectrum

(e) Prism (v) ray of light from glass to air

Ans. (a) - (iv), (b)-(v), (c)-(i), (d)-(ii), (e)-(iii)

Discussion

16412.	Name th material used for making a fuse wire. Give a reason.
Answer» Name th material used for making a fuse wire. Give a reason.

Discussion

16413.	In a myopic eye, the image of a distant object is formed in front of retina and not at the retina itself. Why does this defect arise?
Answer» In a myopic eye, the image of a distant object is formed in front of retina and not at the retina itself. Why does this defect arise?

Discussion

16414.	A crane uses a mysterious object ‘X’ to separate magnetic materials from junk. The object ‘X’ is most probably
Answer» A crane uses a mysterious object ‘X’ to separate magnetic materials from junk. The object ‘X’ is most probably

Discussion

16415.	If position of B with respect to P, is +2 m and position of C with respect to P is −4 m. Where B, P, C are the points along X−axis, then what will be the position of B with respect to C ?
Answer» If position of $B$ with respect to $P$ , is $+ 2 m$ and position of $C$ with respect to $P$ is $- 4 m$ . Where $B, P, C$ are the points along $X -$ axis, then what will be the position of $B$ with respect to $C$ ?

Discussion

16416.	Name the coil of which the wire is thicker in a (i) step up, (ii) step down transformer. Give a reason for your answer.
Answer» Name the coil of which the wire is thicker in a (i) step up, (ii) step down transformer. Give a reason for your answer.

Discussion

16417.	A straight current carrying conductor is placed in a magnetic field but no force acts on it. What can be the reason behind this?
Answer» A straight current carrying conductor is placed in a magnetic field but no force acts on it. What can be the reason behind this?

Discussion

16418.	Can you give me all the formulas of chapter Electricity?
Answer» Can you give me all the formulas of chapter Electricity?

Discussion

16419.	Why is it difficult to shoot a fish swimming in water ?
Answer» Why is it difficult to shoot a fish swimming in water ?

Discussion

16420.	What is different between mass and weight
Answer» What is different between mass and weight

Discussion

16421.	Why does the current always remain the same in a series circuit? When the charges encounter a resistor, wouldn't the speed of flow decrease? If the speed decreases, shouldn't the rate of flow decrease at the same time?
Answer» Why does the current always remain the same in a series circuit? When the charges encounter a resistor, wouldn't the speed of flow decrease? If the speed decreases, shouldn't the rate of flow decrease at the same time?

Discussion

16422.	Noopor needs a lens of power - 4.5D for correction of her vision. What is the focal lens and the nature of the corrective leans?
Answer» Noopor needs a lens of power - 4.5D for correction of her vision. What is the focal lens and the nature of the corrective leans?

16422.

Noopor needs a lens of power - 4.5D for correction of her vision. What is the focal lens and the nature of the corrective leans?

Answer»

Noopor needs a lens of power - 4.5D for correction of her vision.

What is the focal lens and the nature of the corrective leans?

Discussion

16423.	if there was no ozone layer present before the existence of life , then why did the meteor caught fire while entering the earth's orbit, when oxygen is necessary for burning
Answer» if there was no ozone layer present before the existence of life , then why did the meteor caught fire while entering the earth's orbit, when oxygen is necessary for burning

Discussion

16424.	A concave lens has a focal length of 15 cm. At what distance should the object be from the lens placed so that if forms an image 10 cm from the lens?
Answer» A concave lens has a focal length of 15 cm. At what distance should the object be from the lens placed so that if forms an image 10 cm from the lens?

Discussion

16425.	Consider the statements: 1. Primary waves totally disappear in the core region revealing that outer core is made up of liquid. 2. Secondary waves show changes in its speed as it travels from magma chamber to lithosphere region indicating difference in density. 3. The speed of secondary waves is highest inside the Earth’s Core region indicating highest density in the Core region. Choose the correct statement/s:
Answer» Consider the statements: 1. Primary waves totally disappear in the core region revealing that outer core is made up of liquid. 2. Secondary waves show changes in its speed as it travels from magma chamber to lithosphere region indicating difference in density. 3. The speed of secondary waves is highest inside the Earth’s Core region indicating highest density in the Core region. Choose the correct statement/s:

16425.

Consider the statements: 1. Primary waves totally disappear in the core region revealing that outer core is made up of liquid. 2. Secondary waves show changes in its speed as it travels from magma chamber to lithosphere region indicating difference in density. 3. The speed of secondary waves is highest inside the Earth’s Core region indicating highest density in the Core region. Choose the correct statement/s:

Answer»

Consider the statements:

1. Primary waves totally disappear in the core region revealing that outer core is made up of liquid.

2. Secondary waves show changes in its speed as it travels from magma chamber to lithosphere region indicating difference in density.

3. The speed of secondary waves is highest inside the Earth’s Core region indicating highest density in the Core region.

Choose the correct statement/s:

Discussion

16426.	If a red light ray falls on the following system of prisms then after dispersion how many colours do we see in the emergent ray?
Answer» If a red light ray falls on the following system of prisms then after dispersion how many colours do we see in the emergent ray?

16426.

If a red light ray falls on the following system of prisms then after dispersion how many colours do we see in the emergent ray?

Answer»

If a red light ray falls on the following system of prisms then after dispersion how many colours do we see in the emergent ray?

Discussion

16427.	Amrita bishnoi lost her life while saving forest of _____ trees
Answer» Amrita bishnoi lost her life while saving forest of _____ trees

Discussion

16428.	If the no. of turns of a circular current carrying coil are doubled, then how will the magnetic field produced by it changes?
Answer» If the no. of turns of a circular current carrying coil are doubled, then how will the magnetic field produced by it changes?

Discussion

16429.	Electromagnetic induction refers to the:
Answer» Electromagnetic induction refers to the:

Discussion

16430.	State and explain Fleming's right hand rule.
Answer» State and explain Fleming's right hand rule.

Discussion

16431.	At what distance from a concave mirror of focal length 10 cm should an object be placed so that : (a) its real image is formed 20 cm from the mirror ? (b) its virtual image is formed 20 cm from the mirror ?
Answer» At what distance from a concave mirror of focal length 10 cm should an object be placed so that : (a) its real image is formed 20 cm from the mirror ? (b) its virtual image is formed 20 cm from the mirror ?

Discussion

16432.	A piece of ice of mass 40 g is added to 200 g of water at 50oC. Calculate the final temperature of water when all the ice has melted.Specific heat capacity of water=4200 J kg−1 K−1 and specific latent heat of fusion of ice =336 ×103 J kg−1.
Answer» A piece of ice of mass 40 g is added to 200 g of water at $50^{o} C$ . Calculate the final temperature of water when all the ice has melted.Specific heat capacity of water=4200 J k $g^{- 1} K^{- 1}$ and specific latent heat of fusion of ice =336 $\times 10^{3} J k g^{- 1}$ .

Discussion

16433.	In Activity 13.7, how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased;
Answer» In Activity 13.7, how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased;

Discussion

16434.	The distance of a planet from the sun is 5 times the distance between the earth and the sun. The time period of revolution of the planet is
Answer» The distance of a planet from the sun is 5 times the distance between the earth and the sun. The time period of revolution of the planet is

Discussion

16435.	Which of the following forces is responsible for the raindrops falling downwards?
Answer» Which of the following forces is responsible for the raindrops falling downwards?

Discussion

16436.	11C undergoes β+ decay to 11B. What is the maximum energy a positron emitted in the process can possess? Atomic masses: 11C:11.0114 u; 11B:11.0093 u; e−: 0.005486. c2=931MeVu.
Answer» $^{11} C$ undergoes $β^{+}$ decay to $^{11} B .$ What is the maximum energy a positron emitted in the process can possess? Atomic masses: $^{11} C : 11.0114 u;^{11} B : 11.0093 u; e^{-} : 0.005486. c^{2} = 931 \frac{M e V}{u}$ .

Discussion

16437.	Eleven 15 Ω and four 7 Ω resistors are connected in series. If a new resistance of 21 Ω is added in series, the change in the effective resistance would be:
Answer» Eleven $15 Ω$ and four $7 Ω$ resistors are connected in series. If a new resistance of $21 Ω$ is added in series, the change in the effective resistance would be:

Discussion

16438.	If the voltage across 2 points is 5V, what is the current in the circuit when resistance in the circuit is 15Ω?
Answer» If the voltage across 2 points is 5V, what is the current in the circuit when resistance in the circuit is 15Ω?

Discussion

16439.	If a wire is stretched, what happens - the length of wire increases or the area of wire decreases?
Answer» If a wire is stretched, what happens - the length of wire increases or the area of wire decreases?

Discussion

16440.	The speed of light in glass is 1.5 x 108m/s. Then refractive index of glass is
Answer» The speed of light in glass is 1.5 x 10⁸m/s. Then refractive index of glass is

Discussion

16441.	How coal gas is obtained? Enlist its uses. [3 MARKS]
Answer» How coal gas is obtained? Enlist its uses. [3 MARKS]

Discussion

16442.	Is it possible to find the electrical energy in terms of kJ if the power consumed by a toaster in 15 min is 125 W?
Answer» Is it possible to find the electrical energy in terms of kJ if the power consumed by a toaster in 15 min is 125 W?

Discussion

16443.	An object is placed 15 cm in front of a lens. The lens forms a real image three times magnified. Find out the image distance and the focal length of a lens?
Answer» An object is placed $15 c m$ in front of a lens. The lens forms a real image three times magnified. Find out the image distance and the focal length of a lens?

Discussion

16444.	If 3.2 J of work is done in moving 0.4 C of charge in a circuit, find the potential difference (in V) across the circuit.8
Answer» If $3.2 J$ of work is done in moving $0.4 C$ of charge in a circuit, find the potential difference (in $V$ ) across the circuit. 8

Discussion

16445.	How many electrons will flow through a wire when the charge of 4C flows for 2 sec? Also find the current.
Answer» How many electrons will flow through a wire when the charge of 4C flows for 2 sec? Also find the current.

Discussion

16446.	A convex lens is of focal length 10cm, then what is its power?
Answer» A convex lens is of focal length 10cm, then what is its power?

Discussion

16447.	What is electric energy?
Answer» What is electric energy?

Discussion

16448.	What is electrical energy?
Answer» What is electrical energy?

Discussion

16449.	The change in focal length of an eye-lens is caused by the action of the : (a) pupil (b) retina (c) ciliary muscles (d) iris
Answer» The change in focal length of an eye-lens is caused by the action of the : (a) pupil (b) retina (c) ciliary muscles (d) iris

Discussion

16450.	Supply of oxygen to the biogas plant will have:
Answer» Supply of oxygen to the biogas plant will have:

Discussion

Explore topic-wise InterviewSolutions in .

Two spheres have masses in the ratio 2:3 but have same gravitational PE. Calculate the ratio of their heights &amp; weights.

A ray of light passes through a right-angled prism as shown in the given figure. The angle of incidence at the faces AC and BC are:

The objective lens of microscope use

State the difference in colors of the sun observed during sunrise/sunset and noon. Give explanation for each.

How is heat capacity of a body related to specific heat capacity of its substance?

A wire of length l is bent in the form of a circular loop and is suspended in a region of a uniform magnetic field . When a steady current I is passed through the loop, the maximum torque experienced by it is

A hypothetical planet has density r, radius R and surface gravitational acceleration g. If the radius of the planet were doubled, but the planetary density stayed the same, the acceleration due to gravity at the planet’s surface would be:

The steps for the nuclear fission are shown using the Liquid drop model. Which of these is the correct sequence?

Match the following : Column A Column B (a) White light (i) Convex mirror (b) Refraction (ii) concave mirror (c) Virtual images (iii) refraction (d) Real images (iv) spectrum (e) Prism (v) ray of light from glass to air Ans. (a) - (iv), (b)-(v), (c)-(i), (d)-(ii), (e)-(iii)

Name th material used for making a fuse wire. Give a reason.

In a myopic eye, the image of a distant object is formed in front of retina and not at the retina itself. Why does this defect arise?

A crane uses a mysterious object ‘X’ to separate magnetic materials from junk. The object ‘X’ is most probably

If position of B with respect to P, is +2 m and position of C with respect to P is −4 m. Where B, P, C are the points along X−axis, then what will be the position of B with respect to C ?

Name the coil of which the wire is thicker in a (i) step up, (ii) step down transformer. Give a reason for your answer.

A straight current carrying conductor is placed in a magnetic field but no force acts on it. What can be the reason behind this?

Can you give me all the formulas of chapter Electricity?

Why is it difficult to shoot a fish swimming in water ?

What is different between mass and weight

Why does the current always remain the same in a series circuit? When the charges encounter a resistor, wouldn't the speed of flow decrease? If the speed decreases, shouldn't the rate of flow decrease at the same time?

Noopor needs a lens of power - 4.5D for correction of her vision. What is the focal lens and the nature of the corrective leans?

if there was no ozone layer present before the existence of life , then why did the meteor caught fire while entering the earth's orbit, when oxygen is necessary for burning

A concave lens has a focal length of 15 cm. At what distance should the object be from the lens placed so that if forms an image 10 cm from the lens?

If a red light ray falls on the following system of prisms then after dispersion how many colours do we see in the emergent ray?

Amrita bishnoi lost her life while saving forest of _____ trees

If the no. of turns of a circular current carrying coil are doubled, then how will the magnetic field produced by it changes?

Electromagnetic induction refers to the:

State and explain Fleming's right hand rule.

At what distance from a concave mirror of focal length 10 cm should an object be placed so that : (a) its real image is formed 20 cm from the mirror ? (b) its virtual image is formed 20 cm from the mirror ?

A piece of ice of mass 40 g is added to 200 g of water at 50oC. Calculate the final temperature of water when all the ice has melted.Specific heat capacity of water=4200 J kg−1 K−1 and specific latent heat of fusion of ice =336 ×103 J kg−1.

In Activity 13.7, how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased;

The distance of a planet from the sun is 5 times the distance between the earth and the sun. The time period of revolution of the planet is

Which of the following forces is responsible for the raindrops falling downwards?

11C undergoes β+ decay to 11B. What is the maximum energy a positron emitted in the process can possess? Atomic masses: 11C:11.0114 u; 11B:11.0093 u; e−: 0.005486. c2=931MeVu.

Eleven 15 Ω and four 7 Ω resistors are connected in series. If a new resistance of 21 Ω is added in series, the change in the effective resistance would be:

If the voltage across 2 points is 5V, what is the current in the circuit when resistance in the circuit is 15Ω?

If a wire is stretched, what happens - the length of wire increases or the area of wire decreases?

The speed of light in glass is 1.5 x 108m/s. Then refractive index of glass is

How coal gas is obtained? Enlist its uses. [3 MARKS]

Is it possible to find the electrical energy in terms of kJ if the power consumed by a toaster in 15 min is 125 W?

An object is placed 15 cm in front of a lens. The lens forms a real image three times magnified. Find out the image distance and the focal length of a lens?

If 3.2 J of work is done in moving 0.4 C of charge in a circuit, find the potential difference (in V) across the circuit.8

How many electrons will flow through a wire when the charge of 4C flows for 2 sec? Also find the current.

A convex lens is of focal length 10cm, then what is its power?

What is electric energy?

What is electrical energy?

The change in focal length of an eye-lens is caused by the action of the : (a) pupil (b) retina (c) ciliary muscles (d) iris

Supply of oxygen to the biogas plant will have:

Two spheres have masses in the ratio 2:3 but have same gravitational PE. Calculate the ratio of their heights & weights.