16569 + Interview Questions in Physics Page 35 InterviewSolution

1701.	Which of the following forms a transparent bulge on the front surface of the eye?
Answer» Which of the following forms a transparent bulge on the front surface of the eye?

Discussion

1702.	36. The specific conductance of a N/10 KCl at 25 degree C is 0.0112ohm-¹cm-¹. the resistance of cell containing solution at the same temperature was found to be 55ohm. The cell constant will be
Answer» 36. The specific conductance of a N/10 KCl at 25 degree C is 0.0112ohm-¹cm-¹. the resistance of cell containing solution at the same temperature was found to be 55ohm. The cell constant will be

Discussion

1703.	what is the value of Rydberg's constant-109677/cm or -2.18*10raised to the power-18
Answer» what is the value of Rydberg's constant-109677/cm or -2.18*10raised to the power-18

Discussion

1704.	A conductor is carrying a current, and a magnet is placed next to it as shown. Now it is known that the magnet moves away from you perpendicular to the plane. What should be the current in another wire (shown in green) in order to keep the magnet in place? (Consider the force only on the north pole)
Answer» A conductor is carrying a current, and a magnet is placed next to it as shown. Now it is known that the magnet moves away from you perpendicular to the plane. What should be the current in another wire (shown in green) in order to keep the magnet in place? (Consider the force only on the north pole)

Discussion

1705.	The flow of which of the following fundamental particles leads to the existence of electricity in a conductor?
Answer» The flow of which of the following fundamental particles leads to the existence of electricity in a conductor?

Discussion

1706.	Images formed by spherical mirrors are always virtual. Do you agree? Give reasons.
Answer» Images formed by spherical mirrors are always virtual. Do you agree? Give reasons.

Discussion

1707.	200 mL of 0.2 M HCl is mixed with 300 mL of0.1 M NaOH. The molar heat of neutralization of this reaction is −57.1 kJ. The increase in temperature in oC of the system on mixing is x×10−2. The value of x is (Nearest integer)[Given: Specific heat of water = 4.18 J g−1 K−1 Density of water = 1.00 g cm−3][Assume no volume change on mixing]
Answer» 200 mL of $0.2 M H C l$ is mixed with 300 mL of $0.1 M N a O H$ . The molar heat of neutralization of this reaction is $- 57.1 k J$ . The increase in temperature in $^{o} C$ of the system on mixing is $x \times 10^{- 2}$ . The value of x is (Nearest integer) [Given: Specific heat of water = 4.18 J $g^{- 1} K^{- 1}$ Density of water = 1.00 g $c m^{- 3}$ ] [Assume no volume change on mixing]

Discussion

1708.	79. The convex surface of a thin cancavo-convex lens of glass of refractive index 1.5 h
Answer» 79. The convex surface of a thin cancavo-convex lens of glass of refractive index 1.5 h

Discussion

1709.	A light ray is travelling from Region 1 to 4 as shown in the figure. The refractive index of the regions are also mentioned there. The angle of incidence θ for which the beam just missess entering region 4 is :
Answer» A light ray is travelling from Region $1$ to $4$ as shown in the figure. The refractive index of the regions are also mentioned there. The angle of incidence $θ$ for which the beam just missess entering region $4$ is :

Discussion

1710.	A long wire is bent into the shape PQRST as shown in the figure with QRS being a semicircle with centre O and radius r. A current I flows through it in the direction P→Q→R→S→T. The net magnetic field at point O is
Answer» A long wire is bent into the shape PQRST as shown in the figure with QRS being a semicircle with centre O and radius r. A current I flows through it in the direction $P \to Q \to R \to S \to T$ . The net magnetic field at point O is

Discussion

1711.	Compare the gravitational forces exerted by the Sun and the Moon on the Earth. Which one exerts a greater force on the Earth? (Given: mass of the Sun, Ms=4×1031 kg; the mass of Moon, Mm=6.3×1022 kg; distance between Sun and Earth, r=1.3×1012 m and the distance between Moon and Earth,r=4.5×108 m)
Answer» Compare the gravitational forces exerted by the Sun and the Moon on the Earth. Which one exerts a greater force on the Earth? (Given: mass of the Sun, $M_{s} = 4 \times 10^{31}$ kg; the mass of Moon, $M_{m} = 6.3 \times 10^{22}$ kg; distance between Sun and Earth, $r = 1.3 \times 10^{12}$ m and the distance between Moon and Earth, $r = 4.5 \times 10^{8}$ m)

Discussion

1712.	When the potential difference applied to an x-ray tube is 10 kV , the minimum wavelength of continuous x-ray spectrum is λ0. Further when the potential difference applied is increased from 10 kV to 20 kV , the difference of wavelengths of K0 line and minimum wavelength of continuous x- ray increases to twice of its initial value . Atomic number of anode material of x-ray tube is Z. If the value of Z−1 equals √ngλ0R, then find the value of n ______.
Answer» When the potential difference applied to an x-ray tube is $10 kV$ , the minimum wavelength of continuous x-ray spectrum is $λ_{0} .$ Further when the potential difference applied is increased from $10 kV to 20 kV$ , the difference of wavelengths of $K_{0}$ line and minimum wavelength of continuous x- ray increases to twice of its initial value . Atomic number of anode material of x-ray tube is $Z$ . If the value of $Z - 1$ equals $\sqrt{\frac{n}{g λ_{0} R}},$ then find the value of $n$ ______.

Discussion

1713.	The phenomenon responsible for twinkling of stars is ___
Answer» The phenomenon responsible for twinkling of stars is ___

Discussion

1714.	A simple pendulum has a time period T1 when on the earth's surface and T2 when taken to a height R above the earth's surface, where R is the radius of the earth. The value of T2T1 is
Answer» A simple pendulum has a time period $T_{1}$ when on the earth's surface and $T_{2}$ when taken to a height $R$ above the earth's surface, where $R$ is the radius of the earth. The value of $\frac{T_{2}}{T_{1}}$ is

Discussion

1715.	For the circuit shown below, IREF is equal to
Answer» For the circuit shown below, $I_{R E F}$ is equal to

Discussion

1716.	13.The following table gives the values of the angle of deviation for different values of the angle of incidence for a triangular prism Angle of incidence:33,38,42,52,60,71 Angle of deviation:60,50,46,40,43,50, For what values of the angle of incidence ,is the angle of emergence likely to be equal to the angle of incidence itself?
Answer» 13.The following table gives the values of the angle of deviation for different values of the angle of incidence for a triangular prism Angle of incidence:33,38,42,52,60,71 Angle of deviation:60,50,46,40,43,50, For what values of the angle of incidence ,is the angle of emergence likely to be equal to the angle of incidence itself?

Discussion

1717.	Two coils are having magnetic field B and 2B at their centres and current i and 2i, then the ratio of their radius is
Answer» Two coils are having magnetic field B and 2B at their centres and current i and 2i, then the ratio of their radius is

Discussion

1718.	Assertion: The magnetic field is stronger at a point which is nearer to the conductor andgoes on decreasing on moving away from the conductor. Reason: The magnetic field B produced by a straight current carrying wire is inverselyproportional to the distance from the wire.
Answer» Assertion: The magnetic field is stronger at a point which is nearer to the conductor and goes on decreasing on moving away from the conductor. Reason: The magnetic field B produced by a straight current carrying wire is inversely proportional to the distance from the wire.

Discussion

1719.	Select the correct relation(s) for pressure.
Answer» Select the correct relation(s) for pressure.

Discussion

1720.	In the adjacent diagram, AO is a ray of light incident on a rectangular glass slab. (a) Complete the path of the ray till it emerges out of the slab. (b) In the diagram, mark the angle of incidence (i) and the angle of refraction (r) at the first interface. How is the refractive index of glass related to the angles i and r ? (c) Mark angle of emergence by the letter e. How are the angles i and e related ? (d) Which two rays are parallel to each other ? (e) Indicate in the diagram the lateral displacement between the emergent ray and the incident ray. State one factor that affects the lateral displacement.
Answer» In the adjacent diagram, AO is a ray of light incident on a rectangular glass slab. (a) Complete the path of the ray till it emerges out of the slab. (b) In the diagram, mark the angle of incidence (i) and the angle of refraction (r) at the first interface. How is the refractive index of glass related to the angles i and r ? (c) Mark angle of emergence by the letter e. How are the angles i and e related ? (d) Which two rays are parallel to each other ? (e) Indicate in the diagram the lateral displacement between the emergent ray and the incident ray. State one factor that affects the lateral displacement.

1720.

In the adjacent diagram, AO is a ray of light incident on a rectangular glass slab. (a) Complete the path of the ray till it emerges out of the slab. (b) In the diagram, mark the angle of incidence (i) and the angle of refraction (r) at the first interface. How is the refractive index of glass related to the angles i and r ? (c) Mark angle of emergence by the letter e. How are the angles i and e related ? (d) Which two rays are parallel to each other ? (e) Indicate in the diagram the lateral displacement between the emergent ray and the incident ray. State one factor that affects the lateral displacement.

Answer»

In the adjacent diagram, AO is a ray of light incident on a rectangular glass slab.

(a) Complete the path of the ray till it emerges out of the slab.

(b) In the diagram, mark the angle of incidence (i) and the angle of refraction (r) at the first interface. How is the refractive index of glass related to the angles i and r ?

(c) Mark angle of emergence by the letter e. How are the angles i and e related ?

(d) Which two rays are parallel to each other ?

(e) Indicate in the diagram the lateral displacement between the emergent ray and the incident ray. State one factor that affects the lateral displacement.

Discussion

1721.	If the rate of change in the volume of a sphere is equal to the rate of change in its radius, then the radius is equal to
Answer» If the rate of change in the volume of a sphere is equal to the rate of change in its radius, then the radius is equal to

Discussion

1722.	a sheet of relative permeability 100 is placed inside the solenoid so as to fill the space what will be the energy stored inside the solenoid
Answer» a sheet of relative permeability 100 is placed inside the solenoid so as to fill the space what will be the energy stored inside the solenoid

Discussion

1723.	A stone dropped from a tower reaches the ground in 5s. The height of the tower is___ m.
Answer» A stone dropped from a tower reaches the ground in 5s. The height of the tower is___ m.

Discussion

1724.	Why ink of toner which is negatively charged stick to the paper even though it's neutral? How the is gets a negative charge?
Answer» Why ink of toner which is negatively charged stick to the paper even though it's neutral? How the is gets a negative charge?

Discussion

1725.	A student is not able to see what is written on the black board while sitting in the last row. What is the defect of vision in this case?
Answer» A student is not able to see what is written on the black board while sitting in the last row. What is the defect of vision in this case?

Discussion

1726.	Q. If the earth suddenly shrinks to half of its present size then acceleration due to gravity will be?
Answer» Q. If the earth suddenly shrinks to half of its present size then acceleration due to gravity will be?

Discussion

1727.	Where does the greatest degree of refraction of light occur in the eye ?
Answer» Where does the greatest degree of refraction of light occur in the eye ?

Discussion

1728.	The average atomic mass of a sample of an element X is 16.4 u. What are the percentage of isotopes 168X and 188X respectively in the sample?
Answer» The average atomic mass of a sample of an element $X$ is $16.4 u$ . What are the percentage of isotopes $_{8}^{16} X$ and $_{8}^{18} X$ respectively in the sample?

Discussion

1729.	What is the law of resistance is connected in series
Answer» What is the law of resistance is connected in series

Discussion

1730.	Write down a relation expressing the mechanical advantage of a lever.
Answer» Write down a relation expressing the mechanical advantage of a lever.

Discussion

1731.	22. Twelve wires of equal resistance R are connectedto form a cube. The effective resistance betweentwo diagonal ends A and E will beDA6R(2)5R(1)6(3) 12 R(4) 3 R
Answer» 22. Twelve wires of equal resistance R are connected to form a cube. The effective resistance between two diagonal ends A and E will be D A 6R (2) 5R (1) 6 (3) 12 R (4) 3 R

Discussion

1732.	A vessel contains water up to a height of 20 cm and above the water is oil up to another 20 cm. The refractive indices of the water and the oil are 1.33 and 1.30 respectively. The apparent depth of the vessel when viewed from above:
Answer» A vessel contains water up to a height of 20 cm and above the water is oil up to another 20 cm. The refractive indices of the water and the oil are 1.33 and 1.30 respectively. The apparent depth of the vessel when viewed from above:

Discussion

1733.	Answer the following : A) What will be the resistance of a metal wire of length 2 metres and area of cross section 1.55×10-6m2, If the resistivity of the metal be 2.8×10-8 ohm-metre? B) How does the presence of impurities in a metal affect it's resistance? C) What happens to the resistance as the conductor is made thinner?
Answer» Answer the following : A) What will be the resistance of a metal wire of length 2 metres and area of cross section 1.55×10^-6m², If the resistivity of the metal be 2.8×10^-8ohm-metre? B) How does the presence of impurities in a metal affect it's resistance? C) What happens to the resistance as the conductor is made thinner?

Discussion

1734.	20.What is electromagnetic induction?On what factors does the value of induced current produced in a circuit depend?Name and state the rule used for determination of direction of induced current. State one application of this phenomenon in everyday life.
Answer» 20.What is electromagnetic induction?On what factors does the value of induced current produced in a circuit depend?Name and state the rule used for determination of direction of induced current. State one application of this phenomenon in everyday life.

Discussion

1735.	Which of the following facts is false about HST?
Answer» Which of the following facts is false about HST?

Discussion

1736.	When stating the volume of a gas, the pressure and temperature should also be given. Why?
Answer» When stating the volume of a gas, the pressure and temperature should also be given. Why?

Discussion

1737.	Show by a diagram, the refraction of two light rays incident parallel to the prinicipal axis of a concave lens by treating it as a combination of a glass slab and two triangular glass prisms.
Answer» Show by a diagram, the refraction of two light rays incident parallel to the prinicipal axis of a concave lens by treating it as a combination of a glass slab and two triangular glass prisms.

Discussion

1738.	10.How will we get to know that the given values of electrode potential are oxidation potential or reduction potential?
Answer» 10.How will we get to know that the given values of electrode potential are oxidation potential or reduction potential?

Discussion

1739.	Match the formulae with their names
Answer» Match the formulae with their names

Discussion

1740.	If an electrical appliance of R Ω resistance draws a current I for time t, and is connected across a battery of potential V, then the energy consumed by the appliance is:
Answer» If an electrical appliance of $R Ω$ resistance draws a current $I$ for time $t$ , and is connected across a battery of potential $V$ , then the energy consumed by the appliance is:

Discussion

1741.	A thin biconvex lens having radius of curvature 10 cm is placed as shown in figure. Calculate the focal length of the lens, if parallel rays are incident as shown.
Answer» A thin biconvex lens having radius of curvature $10 cm$ is placed as shown in figure. Calculate the focal length of the lens, if parallel rays are incident as shown.

Discussion

1742.	A symmetric double convex lens is cut into two equal parts along a plane parallel to the principal axis. If the power of the original lens is 4 D, the power of cut lens will be:
Answer» A symmetric double convex lens is cut into two equal parts along a plane parallel to the principal axis. If the power of the original lens is $4 D$ , the power of cut lens will be:

Discussion

1743.	Why is there a cos theta in the formula of work done?
Answer» Why is there a cos theta in the formula of work done?

Discussion

1744.	In which medium convex lens will behave like plane mirror
Answer» In which medium convex lens will behave like plane mirror

Discussion

1745.	Any light that gives a spectrum similar to that of sunlight is often referred to as
Answer» Any light that gives a spectrum similar to that of sunlight is often referred to as

Discussion

1746.	A 230 V, 1800 rpm, long shunt, cumulative compound motor has a shunt field resistance of 460 Ω, series field resistance of 0.2 Ω and armature circuit resistance of 1.3 Ω. The full-load line current is 10.5 A. The rotational loss is 5% of the power developed. Then the efficiency (in percentage) of the motor at full load is________.84.57
Answer» A 230 V, 1800 rpm, long shunt, cumulative compound motor has a shunt field resistance of 460 $Ω$ , series field resistance of 0.2 $Ω$ and armature circuit resistance of 1.3 $Ω$ . The full-load line current is 10.5 A. The rotational loss is 5% of the power developed. Then the efficiency (in percentage) of the motor at full load is________. 84.57

Discussion

1747.	Question 1 Define Radioactivity. Write the name of any three radioactive elements. Who discovered Alpha, Beta and Gamma radiations?
Answer» Question 1 Define Radioactivity. Write the name of any three radioactive elements. Who discovered Alpha, Beta and Gamma radiations?

1747.

Question 1 Define Radioactivity. Write the name of any three radioactive elements. Who discovered Alpha, Beta and Gamma radiations?

Answer»

Question 1

Define Radioactivity.

Write the name of any three radioactive elements.

Who discovered Alpha, Beta and Gamma radiations?

Discussion

1748.	A solenoid (L=0.5 H) carries a steady current of 2 A. If the direction of current is reversed in 0.25 s, the magnitude of EMF induced in the solenoid is -
Answer» A solenoid $(L = 0.5 H)$ carries a steady current of $2 A$ . If the direction of current is reversed in $0.25 s$ , the magnitude of EMF induced in the solenoid is -

Discussion

1749.	Why is a voltmeter always connected in a parallel manner with the circuit? Explain
Answer» Why is a voltmeter always connected in a parallel manner with the circuit? Explain

Discussion

1750.	which contains max number of atoms? 1) 4 amu of he 2) 4g atom of he 3) 4g of he 4) 4 atoms of h
Answer» which contains max number of atoms? 1) 4 amu of he 2) 4g atom of he 3) 4g of he 4) 4 atoms of h

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following forms a transparent bulge on the front surface of the eye?

36. The specific conductance of a N/10 KCl at 25 degree C is 0.0112ohm-¹cm-¹. the resistance of cell containing solution at the same temperature was found to be 55ohm. The cell constant will be

what is the value of Rydberg's constant-109677/cm or -2.18*10raised to the power-18

The flow of which of the following fundamental particles leads to the existence of electricity in a conductor?

Images formed by spherical mirrors are always virtual. Do you agree? Give reasons.

79. The convex surface of a thin cancavo-convex lens of glass of refractive index 1.5 h

A light ray is travelling from Region 1 to 4 as shown in the figure. The refractive index of the regions are also mentioned there. The angle of incidence θ for which the beam just missess entering region 4 is :

A long wire is bent into the shape PQRST as shown in the figure with QRS being a semicircle with centre O and radius r. A current I flows through it in the direction P→Q→R→S→T. The net magnetic field at point O is

The phenomenon responsible for twinkling of stars is ___

A simple pendulum has a time period T1 when on the earth's surface and T2 when taken to a height R above the earth's surface, where R is the radius of the earth. The value of T2T1 is

For the circuit shown below, IREF is equal to

Two coils are having magnetic field B and 2B at their centres and current i and 2i, then the ratio of their radius is

Assertion: The magnetic field is stronger at a point which is nearer to the conductor andgoes on decreasing on moving away from the conductor. Reason: The magnetic field B produced by a straight current carrying wire is inverselyproportional to the distance from the wire.

Select the correct relation(s) for pressure.

If the rate of change in the volume of a sphere is equal to the rate of change in its radius, then the radius is equal to

a sheet of relative permeability 100 is placed inside the solenoid so as to fill the space what will be the energy stored inside the solenoid

A stone dropped from a tower reaches the ground in 5s. The height of the tower is___ m.

Why ink of toner which is negatively charged stick to the paper even though it's neutral? How the is gets a negative charge?

A student is not able to see what is written on the black board while sitting in the last row. What is the defect of vision in this case?

Q. If the earth suddenly shrinks to half of its present size then acceleration due to gravity will be?

Where does the greatest degree of refraction of light occur in the eye ?

The average atomic mass of a sample of an element X is 16.4 u. What are the percentage of isotopes 168X and 188X respectively in the sample?

What is the law of resistance is connected in series

Write down a relation expressing the mechanical advantage of a lever.

22. Twelve wires of equal resistance R are connectedto form a cube. The effective resistance betweentwo diagonal ends A and E will beDA6R(2)5R(1)6(3) 12 R(4) 3 R

A vessel contains water up to a height of 20 cm and above the water is oil up to another 20 cm. The refractive indices of the water and the oil are 1.33 and 1.30 respectively. The apparent depth of the vessel when viewed from above:

20.What is electromagnetic induction?On what factors does the value of induced current produced in a circuit depend?Name and state the rule used for determination of direction of induced current. State one application of this phenomenon in everyday life.

Which of the following facts is false about HST?

When stating the volume of a gas, the pressure and temperature should also be given. Why?

Show by a diagram, the refraction of two light rays incident parallel to the prinicipal axis of a concave lens by treating it as a combination of a glass slab and two triangular glass prisms.

10.How will we get to know that the given values of electrode potential are oxidation potential or reduction potential?

Match the formulae with their names

If an electrical appliance of R Ω resistance draws a current I for time t, and is connected across a battery of potential V, then the energy consumed by the appliance is:

A thin biconvex lens having radius of curvature 10 cm is placed as shown in figure. Calculate the focal length of the lens, if parallel rays are incident as shown.

A symmetric double convex lens is cut into two equal parts along a plane parallel to the principal axis. If the power of the original lens is 4 D, the power of cut lens will be:

Why is there a cos theta in the formula of work done?

In which medium convex lens will behave like plane mirror

Any light that gives a spectrum similar to that of sunlight is often referred to as

Question 1 Define Radioactivity. Write the name of any three radioactive elements. Who discovered Alpha, Beta and Gamma radiations?

A solenoid (L=0.5 H) carries a steady current of 2 A. If the direction of current is reversed in 0.25 s, the magnitude of EMF induced in the solenoid is -

Why is a voltmeter always connected in a parallel manner with the circuit? Explain

which contains max number of atoms? 1) 4 amu of he 2) 4g atom of he 3) 4g of he 4) 4 atoms of h