9478 + Interview Questions in Physics Page 53 InterviewSolution

2601.	Show that when an object falls down a smooth incline then it's total energy is constant everywhere
Answer» Show that when an object falls down a smooth incline then it's total energy is constant everywhere

Discussion

2602.	Describe an experiment to show that sound does not travel in a vacuum.
Answer» Describe an experiment to show that sound does not travel in a vacuum.

Discussion

2603.	Liquids cannot conduct electricity. Do you agree? Justify your answer by giving examples.
Answer» Liquids cannot conduct electricity. Do you agree? Justify your answer by giving examples.

Discussion

2604.	{The number of moles of H}}_2}O2
Answer» {The number of moles of H}}_2}O2

Discussion

2605.	Question 06.4 Fill in the blanks in the following.Night birds have _________ cones than rods in their eyes.
Answer» Question 06.4 Fill in the blanks in the following. Night birds have _________ cones than rods in their eyes.

Discussion

2606.	How can fluid exert pressure?
Answer» How can fluid exert pressure?

Discussion

2607.	What is reduction
Answer» What is reduction

Discussion

2608.	What is the difference between error of improper designing/calibration and zero error which are instrumental errors?
Answer» What is the difference between error of improper designing/calibration and zero error which are instrumental errors?

Discussion

2609.	what is the difference between limiting friction and static friction ?
Answer» what is the difference between limiting friction and static friction ?

Discussion

2610.	43. The distance between consecutive crest and trough of a wave is 10cm. If the speed of wave is 200cm/a. Then the time period of wave is 1. 0.01 s 2. 0.2 s 3. 0.02 s 4. 0.1 s
Answer» 43. The distance between consecutive crest and trough of a wave is 10cm. If the speed of wave is 200cm/a. Then the time period of wave is 1. 0.01 s 2. 0.2 s 3. 0.02 s 4. 0.1 s

Discussion

2611.	Four positive charges, two with charge +Q and theother two with charge +q are connected by fourunstretchable strings of equal length, in theabsence of external forces the system is inequilibrium then tan0 is equal to
Answer» Four positive charges, two with charge +Q and theother two with charge +q are connected by fourunstretchable strings of equal length, in theabsence of external forces the system is inequilibrium then tan0 is equal to

Discussion

2612.	In a parallel connection, the current has ______ path(s).
Answer» In a parallel connection, the current has ______ path(s).

Discussion

2613.	two blocks of masses m and M are connected by an inextensible light string. when a con†an t horizontal force acts on the black of mass M. the tension in the string is
Answer» two blocks of masses m and M are connected by an inextensible light string. when a con†an t horizontal force acts on the black of mass M. the tension in the string is

Discussion

2614.	Question 6Loudness of sound is measured in units of(a) Decibel (dB)(b) Hertz (Hz)(c) Metre (m)(d) Metre/second (m/s)
Answer» Question 6 Loudness of sound is measured in units of (a) Decibel (dB) (b) Hertz (Hz) (c) Metre (m) (d) Metre/second (m/s)

Discussion

2615.	What do you mean by fluid friction? Which factors affect fluid friction?
Answer» What do you mean by fluid friction? Which factors affect fluid friction?

Discussion

2616.	In an idle conductor, the net charge will always be equal to .
Answer» In an idle conductor, the net charge will always be equal to .

Discussion

2617.	If a light ray from air enters three different media in such a way that the refracted angles are 450, 300 and 600 respectively. Identify the right statement with respect to the optical density of these media.
Answer» If a light ray from air enters three different media in such a way that the refracted angles are $45^{0}$ , $30^{0}$ and $60^{0}$ respectively. Identify the right statement with respect to the optical density of these media.

Discussion

2618.	A balloon has maximum capacity of 20 L. At oneatmospheric pressure 10 L of air is filled in the balloon. It will burst when pressure is (assumingisothermal condition)(a) > 0.5 atm (b) < 0.5 atm(c) = 0.5 atm (d) >or equal to 0.5 atm
Answer» A balloon has maximum capacity of 20 L. At one atmospheric pressure 10 L of air is filled in the balloon. It will burst when pressure is (assuming isothermal condition) (a) > 0.5 atm (b) < 0.5 atm (c) = 0.5 atm (d) >or equal to 0.5 atm

Discussion

2619.	Question 5Use the data in Table to answer the following –(a) Which among iron and mercury is a better conductor?(b) Which material is the best conductor?Table: Electrical resistivity of some substances at 20∘CMaterialResistivity(Ωm)ConductorsSilver1.60×10−8Copper1.62×10−8Aluminium2.63×10−8Tungsten5.20×10−8Nickel6.84×10−8Iron10.0×10−8Chromium12.9×10−8Mercury94.0×10−8Manganese1.84×10−6AlloysConstantan(alloy of Cu Ni)49×10−6Manganin(alloy of Cu,Mn and Ni)44×10−6Nichrome(alloy of Ni,Cr,Mn and Fe)100×10−6InsulatorsGlass1010−1014Hard rubber1013−1016Ebonite1015−1017Diamond1012−1013Paper(dry)1012
Answer» Question 5 Use the data in Table to answer the following – (a) Which among iron and mercury is a better conductor? (b) Which material is the best conductor? Table: Electrical resistivity of some substances at $20^{\circ} C$ $\begin{matrix} M a t e r i a l & R e s i s t i v i t y (Ω m) C o n d u c t o r s & S i l v e r & 1.60 \times 10^{- 8} C o p p e r & 1.62 \times 10^{- 8} A l u m i n i u m & 2.63 \times 10^{- 8} T u n g s t e n & 5.20 \times 10^{- 8} N i c k e l & 6.84 \times 10^{- 8} I r o n & 10.0 \times 10^{- 8} C h r o m i u m & 12.9 \times 10^{- 8} M e r c u r y & 94.0 \times 10^{- 8} M a n g a n e s e & 1.84 \times 10^{- 6} A l l o y s & C o n s t a n t a n (a l l o y o f C u N i) & 49 \times 10^{- 6} M a n g a n i n (a l l o y o f C u, M n a n d N i) & 44 \times 10^{- 6} N i c h r o m e (a l l o y o f N i, C r, M n a n d F e) & 100 \times 10^{- 6} I n s u l a t o r s & G l a s s & 10^{10} - 10^{14} H a r d r u b b e r & 10^{13} - 10^{16} E b o n i t e & 10^{15} - 10^{17} D i a m o n d & 10^{12} - 10^{13} P a p e r (d r y) & 10^{12} \end{matrix}$

Discussion

2620.	One end of a nichrome wire of length 2L and cross-sectional area A is attached to an end of another nichrome wire of length L and cross-sectional area 2A. If the free end of the longer wire is at an electric potential of 8.0 Volts, and the free end of the shorter wire is at an electric potential of 1.0 Volts, the potential at the junction of the two wires is equal to
Answer» One end of a nichrome wire of length $2 L$ and cross-sectional area $A$ is attached to an end of another nichrome wire of length $L$ and cross-sectional area $2 A$ . If the free end of the longer wire is at an electric potential of $8.0 Volts$ , and the free end of the shorter wire is at an electric potential of $1.0 Volts$ , the potential at the junction of the two wires is equal to

Discussion

2621.	elevation in boiling point of a molar (1M) glucose solution d=1.2 g/ml is
Answer» elevation in boiling point of a molar (1M) glucose solution d=1.2 g/ml is

Discussion

2622.	A box moving on a level ground at a constant velocity is an example of ___ acceleration.
Answer» A box moving on a level ground at a constant velocity is an example of ___ acceleration.

Discussion

2623.	Define the term matter. What is it composed of?
Answer» Define the term matter. What is it composed of?

Discussion

2624.	The value of G (gravitational constant) depends upon____
Answer» The value of G (gravitational constant) depends upon____

Discussion

2625.	A mixture of sodium chloride and sodium iodide when treated with sulphuric acid give sodium sulphate equal to the weight of original mixture. Find out percentage composition of sodium chloride and sodium iodide.
Answer» A mixture of sodium chloride and sodium iodide when treated with sulphuric acid give sodium sulphate equal to the weight of original mixture. Find out percentage composition of sodium chloride and sodium iodide.

Discussion

2626.	Which of the following graphs shows the variation in density of water with the temperature in the range from 0 ∘C to 10 ∘C?
Answer» Which of the following graphs shows the variation in density of water with the temperature in the range from 0 $^{\circ} C$ to 10 $^{\circ} C$ ?

Discussion

2627.	Our ears balance our body
Answer» Our ears balance our body

Discussion

2628.	molarity of 29% w/w H2So4 solutiom whose density is 1.22 g/ml
Answer» molarity of 29% w/w H2So4 solutiom whose density is 1.22 g/ml

Discussion

2629.	If z1, z2, z3 are complex numbers such that z1=z2=z3=1z1+1z2+1z3=1, then find the value of z1+z2+z3.
Answer» If z₁, z₂, z₃ are complex numbers such that $\|z_{1}\| = \|z_{2}\| = \|z_{3}\| = \|\frac{1}{z_{1}} + \frac{1}{z_{2}} + \frac{1}{z_{3}}\| = 1$ , then find the value of $\|z_{1} + z_{2} + z_{3}\|$ .

Discussion

2630.	What is an oscillation?what is the time taken by an oscillating body to complete one oscillation called?
Answer» What is an oscillation?what is the time taken by an oscillating body to complete one oscillation called?

Discussion

2631.	Which among the following statement is true?
Answer» Which among the following statement is true?

Discussion

2632.	A surface is rubbed to make it smoother. What effect will this have on friction? Give reasons.
Answer» A surface is rubbed to make it smoother. What effect will this have on friction? Give reasons.

Discussion

2633.	What are meteoroids? Which of the two is really a member of the solar system : Meteoroid or Meteor?
Answer» What are meteoroids? Which of the two is really a member of the solar system : Meteoroid or Meteor?

Discussion

2634.	Consider the clocked sequential circuit shown below:The state diagram of the above sequential circuit is
Answer» Consider the clocked sequential circuit shown below: The state diagram of the above sequential circuit is

Discussion

2635.	Which of the following process could be the final step in production of electricity in any power plant?
Answer» Which of the following process could be the final step in production of electricity in any power plant?

Discussion

2636.	Find the amount of electric current (in ampere) if a charge of 0.8 C flows through a conductor in 4 seconds.0.2
Answer» Find the amount of electric current (in ampere) if a charge of 0.8 C flows through a conductor in 4 seconds. 0.2

Discussion

2637.	1 g of a substance of relative density 2,and 4g of relative density 3 are mixed together .The relative density of their mixture is about -?
Answer» 1 g of a substance of relative density 2,and 4g of relative density 3 are mixed together .The relative density of their mixture is about -?

Discussion

2638.	18. An open pipe with length 3m and outer radius 10 cm has an outer layer of ice tgat is melting at the rate of 2π cm cube/ min. How fast is the thickness of ice decreasing when the ice is 2 cm thick.
Answer» 18. An open pipe with length 3m and outer radius 10 cm has an outer layer of ice tgat is melting at the rate of 2π cm cube/ min. How fast is the thickness of ice decreasing when the ice is 2 cm thick.

Discussion

2639.	Is their life on mars?
Answer» Is their life on mars?

Discussion

2640.	Give reasons. (a) A magnetic needle comes to rest in the north-south position. (b) A magnetic needle is used in a mariner’s compass. (c) If a bar magnet is suspended vertically it does not hang in the north-south direction. (d) Repulsion rather than attraction is the test for identifying a magnet.
Answer» Give reasons. (a) A magnetic needle comes to rest in the north-south position. (b) A magnetic needle is used in a mariner’s compass. (c) If a bar magnet is suspended vertically it does not hang in the north-south direction. (d) Repulsion rather than attraction is the test for identifying a magnet.

2640.

Give reasons. (a) A magnetic needle comes to rest in the north-south position. (b) A magnetic needle is used in a mariner’s compass. (c) If a bar magnet is suspended vertically it does not hang in the north-south direction. (d) Repulsion rather than attraction is the test for identifying a magnet.

Answer»

Give reasons.

(a) A magnetic needle comes to rest in the north-south position.

(b) A magnetic needle is used in a mariner’s compass.

(c) If a bar magnet is suspended vertically it does not hang in the north-south direction.

(d) Repulsion rather than attraction is the test for identifying a magnet.

Discussion

2641.	110.calculate the inductance and resistance required to operate a lamp( 60V,10W) from a source of 100V 50Hz ( the resistance and inductance are in separate circuits)
Answer» 110.calculate the inductance and resistance required to operate a lamp( 60V,10W) from a source of 100V 50Hz ( the resistance and inductance are in separate circuits)

Discussion

2642.	What is the unit of the Velocity ratio?
Answer» What is the unit of the Velocity ratio?

Discussion

2643.	The stress-strain curves are drawn for two differentmaterials X and Y. It is observed that the ultimatsstrength point and the fracture point are close toeach other for material X but are far apart for material Y.We can say that materials X and Y are likely tobe (respectively) (1) Plastic and ductile (2) Ductile and brittle(3) Brittle and ductile (4) Brittle and plastic
Answer» The stress-strain curves are drawn for two differentmaterials X and Y. It is observed that the ultimatsstrength point and the fracture point are close toeach other for material X but are far apart for material Y.We can say that materials X and Y are likely tobe (respectively) (1) Plastic and ductile (2) Ductile and brittle(3) Brittle and ductile (4) Brittle and plastic

Discussion

2644.	22. How to calculate equivalent weight of water?
Answer» 22. How to calculate equivalent weight of water?

Discussion

2645.	When an object is placed at a distance of 60 cm from a convex mirror, the magnification produced is 1/2. Where should the object be placed so that a virtual image of double the size is formed by the mirror?
Answer» When an object is placed at a distance of 60 cm from a convex mirror, the magnification produced is 1/2. Where should the object be placed so that a virtual image of double the size is formed by the mirror?

Discussion

2646.	Explain in detail the concept of unit cell
Answer» Explain in detail the concept of unit cell

Discussion

2647.	Which effect of current is responsible for electrolysis of salt solution?
Answer» Which effect of current is responsible for electrolysis of salt solution?

Discussion

2648.	What is polarization and diffraction ?
Answer» What is polarization and diffraction ?

Discussion

2649.	What is another name for the North Star?
Answer» What is another name for the North Star?

Discussion

2650.	An electroscope is a device which is used to find if an object is
Answer» An electroscope is a device which is used to find if an object is

Discussion

Explore topic-wise InterviewSolutions in .

Show that when an object falls down a smooth incline then it's total energy is constant everywhere

Describe an experiment to show that sound does not travel in a vacuum.

Liquids cannot conduct electricity. Do you agree? Justify your answer by giving examples.

{The number of moles of H}}_2}O2

Question 06.4 Fill in the blanks in the following.Night birds have _________ cones than rods in their eyes.

How can fluid exert pressure?

What is reduction

What is the difference between error of improper designing/calibration and zero error which are instrumental errors?

what is the difference between limiting friction and static friction ?

43. The distance between consecutive crest and trough of a wave is 10cm. If the speed of wave is 200cm/a. Then the time period of wave is 1. 0.01 s 2. 0.2 s 3. 0.02 s 4. 0.1 s

Four positive charges, two with charge +Q and theother two with charge +q are connected by fourunstretchable strings of equal length, in theabsence of external forces the system is inequilibrium then tan0 is equal to

In a parallel connection, the current has ______ path(s).

two blocks of masses m and M are connected by an inextensible light string. when a con†an t horizontal force acts on the black of mass M. the tension in the string is

Question 6Loudness of sound is measured in units of(a) Decibel (dB)(b) Hertz (Hz)(c) Metre (m)(d) Metre/second (m/s)

What do you mean by fluid friction? Which factors affect fluid friction?

In an idle conductor, the net charge will always be equal to .

If a light ray from air enters three different media in such a way that the refracted angles are 450, 300 and 600 respectively. Identify the right statement with respect to the optical density of these media.

A balloon has maximum capacity of 20 L. At oneatmospheric pressure 10 L of air is filled in the balloon. It will burst when pressure is (assumingisothermal condition)(a) > 0.5 atm (b) < 0.5 atm(c) = 0.5 atm (d) >or equal to 0.5 atm

elevation in boiling point of a molar (1M) glucose solution d=1.2 g/ml is

A box moving on a level ground at a constant velocity is an example of ___ acceleration.

Define the term matter. What is it composed of?

The value of G (gravitational constant) depends upon____

A mixture of sodium chloride and sodium iodide when treated with sulphuric acid give sodium sulphate equal to the weight of original mixture. Find out percentage composition of sodium chloride and sodium iodide.

Which of the following graphs shows the variation in density of water with the temperature in the range from 0 ∘C to 10 ∘C?

Our ears balance our body

molarity of 29% w/w H2So4 solutiom whose density is 1.22 g/ml

If z1, z2, z3 are complex numbers such that z1=z2=z3=1z1+1z2+1z3=1, then find the value of z1+z2+z3.

What is an oscillation?what is the time taken by an oscillating body to complete one oscillation called?

Which among the following statement is true?

A surface is rubbed to make it smoother. What effect will this have on friction? Give reasons.

What are meteoroids? Which of the two is really a member of the solar system : Meteoroid or Meteor?

Consider the clocked sequential circuit shown below:The state diagram of the above sequential circuit is

Which of the following process could be the final step in production of electricity in any power plant?

Find the amount of electric current (in ampere) if a charge of 0.8 C flows through a conductor in 4 seconds.0.2

1 g of a substance of relative density 2,and 4g of relative density 3 are mixed together .The relative density of their mixture is about -?

18. An open pipe with length 3m and outer radius 10 cm has an outer layer of ice tgat is melting at the rate of 2π cm cube/ min. How fast is the thickness of ice decreasing when the ice is 2 cm thick.

Is their life on mars?

110.calculate the inductance and resistance required to operate a lamp( 60V,10W) from a source of 100V 50Hz ( the resistance and inductance are in separate circuits)

What is the unit of the Velocity ratio?

22. How to calculate equivalent weight of water?

When an object is placed at a distance of 60 cm from a convex mirror, the magnification produced is 1/2. Where should the object be placed so that a virtual image of double the size is formed by the mirror?

Explain in detail the concept of unit cell

Which effect of current is responsible for electrolysis of salt solution?

What is polarization and diffraction ?

What is another name for the North Star?

An electroscope is a device which is used to find if an object is