9478 + Interview Questions in Physics Page 52 InterviewSolution

2551.	What is an electrolytic cell
Answer» What is an electrolytic cell

Discussion

2552.	22.Two point charges of +3microcoloumb +4microcoloumb repel each other with a force of 10N. If each is given an additional charge of -6microcoloumb, the new force is?
Answer» 22.Two point charges of +3microcoloumb +4microcoloumb repel each other with a force of 10N. If each is given an additional charge of -6microcoloumb, the new force is?

Discussion

2553.	Figure shows a uniform rod of length 30 cm havinga mass 3.0 kg. The rod is pulled by constantforces of 20 N and 32 N as shown. Find the forceexerted by 20 cm part of the rod on the 10 cmpart (all surfaces are smooth) is24.20 N32 N10 cm 20 cm
Answer» Figure shows a uniform rod of length 30 cm havinga mass 3.0 kg. The rod is pulled by constantforces of 20 N and 32 N as shown. Find the forceexerted by 20 cm part of the rod on the 10 cmpart (all surfaces are smooth) is24.20 N32 N10 cm 20 cm

Discussion

2554.	Statement 1: The flow of current in a poor conductor is impossible. Statement 2: Under certain conditions, current can flow through a poor conductor.
Answer» Statement 1: The flow of current in a poor conductor is impossible. Statement 2: Under certain conditions, current can flow through a poor conductor.

Discussion

2555.	The tones that are separated by three octaves have a frequency ratio of
Answer» The tones that are separated by three octaves have a frequency ratio of

Discussion

2556.	Which of the following examples can be explained using Newton's first law of motion
Answer» Which of the following examples can be explained using Newton's first law of motion

Discussion

2557.	A ball thrown vertically upwards with a speed of 19.6 m/s from the top of a tower returns to the base of tower in 6s. Find the height of tower : ( Assume accelaration due to gravity 9.8m/s2
Answer» A ball thrown vertically upwards with a speed of 19.6 m/s from the top of a tower returns to the base of tower in 6s. Find the height of tower : ( Assume accelaration due to gravity $9.8 m / s^{2}$

Discussion

2558.	Question 24You are provided with a magnetic compass, an empty matchbox, a battery of two cells and connecting wires. Using these objects how will you make a tester for testing an electric circuit? Draw the necessary circuit diagram and explain.
Answer» Question 24 You are provided with a magnetic compass, an empty matchbox, a battery of two cells and connecting wires. Using these objects how will you make a tester for testing an electric circuit? Draw the necessary circuit diagram and explain.

Discussion

2559.	25, A ball of density and radius r is dropped on thesurface of a liquid of density p from certain height, ifspeed of ball does not change even on entering inliquid and viscosity of liquid is η , then the heightfrom which ball dropped is2 ,29η 2(o-p)r(3)--9η (4) 2g9η
Answer» 25, A ball of density and radius r is dropped on thesurface of a liquid of density p from certain height, ifspeed of ball does not change even on entering inliquid and viscosity of liquid is η , then the heightfrom which ball dropped is2 ,29η 2(o-p)r(3)--9η (4) 2g9η

Discussion

2560.	Why do our ears ache when we travel by an aeroplane?
Answer» Why do our ears ache when we travel by an aeroplane?

Discussion

2561.	A u shaped wire is dipped in a soap solution and removed.The thin soap film formed between the wire and a light slider supports a weight of 1.5*10-2N.The l of the slider is 30cm.What is the surface tension of the film
Answer» A u shaped wire is dipped in a soap solution and removed.The thin soap film formed between the wire and a light slider supports a weight of 1.5*10-2N.The l of the slider is 30cm.What is the surface tension of the film

Discussion

2562.	Explain what happens when a negatively charged body is placed on the ground? [3 MARKS]
Answer» Explain what happens when a negatively charged body is placed on the ground? [3 MARKS]

Discussion

2563.	What is the frictional force exerted by fluids on objects moving through them known as?
Answer» What is the frictional force exerted by fluids on objects moving through them known as?

Discussion

2564.	an electron is rotating around an infinite positive linear charge in a circle of radius 0.1 m ,if the linear charge density is 1 microcoulomb /metre then the velocity of eletron in m/s will be what??
Answer» an electron is rotating around an infinite positive linear charge in a circle of radius 0.1 m ,if the linear charge density is 1 microcoulomb /metre then the velocity of eletron in m/s will be what??

Discussion

2565.	A horizontal plate has been joined to a vertical post using four rivets arranged as shown in the figure. the magnitude of the load on the worst loaded rivet (in N) is1839.83
Answer» A horizontal plate has been joined to a vertical post using four rivets arranged as shown in the figure. the magnitude of the load on the worst loaded rivet (in N) is 1839.83

Discussion

2566.	What is the SI unit of power?
Answer» What is the SI unit of power?

Discussion

2567.	An unlabelled analog clock seen through a mirror shows two o'clock. What is the actual time shown by the clock?
Answer» An unlabelled analog clock seen through a mirror shows two o'clock. What is the actual time shown by the clock?

Discussion

2568.	What is aperture of a mirror?
Answer» What is aperture of a mirror?

Discussion

2569.	121.Dimensions for li linear charge density
Answer» 121.Dimensions for li linear charge density

Discussion

2570.	A diminished image ofan object is to be obtained on a screen 1 m from it. This can b achieved by appropriately placing (A) A convex mirror of suitable focal length (B) A concave mirrror of suitable focal length (C) A concave lens of suitable focal length (D) A convex lens of suitable focal length less than 0.25 m
Answer» A diminished image ofan object is to be obtained on a screen 1 m from it. This can b achieved by appropriately placing (A) A convex mirror of suitable focal length (B) A concave mirrror of suitable focal length (C) A concave lens of suitable focal length (D) A convex lens of suitable focal length less than 0.25 m

Discussion

2571.	Four containers contain water at same height as shown. Rank them according to pressure exerted at the bottom of containers in ascending order.
Answer» Four containers contain water at same height as shown. Rank them according to pressure exerted at the bottom of containers in ascending order.

2571.

Four containers contain water at same height as shown. Rank them according to pressure exerted at the bottom of containers in ascending order.

Answer»

Four containers contain water at same height as shown. Rank them according to pressure exerted at the bottom of containers in ascending order.

Discussion

2572.	65. what is electropositive and electronegative elements in redox reaction ?
Answer» 65. what is electropositive and electronegative elements in redox reaction ?

Discussion

2573.	Two iron rods - one 10 m long and the other 5 m long, are heated to the same rise in temperature. Which will expand more?
Answer» Two iron rods - one 10 m long and the other 5 m long, are heated to the same rise in temperature. Which will expand more?

Discussion

2574.	If the pressure of 7k pa is acting on the cube of10 cm what is the force?
Answer» If the pressure of 7k pa is acting on the cube of10 cm what is the force?

Discussion

2575.	(a) What is hypermetropia?(b) What are the causes of hypermetropia?(c) Name the lens used to correct hypermetropia?
Answer» (a) What is hypermetropia? (b) What are the causes of hypermetropia? (c) Name the lens used to correct hypermetropia?

Discussion

2576.	If a rectangular tank of depth 8 metre is full of water μ=43, then the bottom is seen at a depth of___metres.
Answer» If a rectangular tank of depth 8 metre is full of water $μ = \frac{4}{3}$ , then the bottom is seen at a depth of___metres.

Discussion

2577.	If the power factor of an AC RL circuit changes from 12 to 14 keeping resistance constant, what is the percentage change in the impedance of the circuit?
Answer» If the power factor of an AC RL circuit changes from $\frac{1}{2}$ to $\frac{1}{4}$ keeping resistance constant, what is the percentage change in the impedance of the circuit?

Discussion

2578.	Calculate the pressure at a depth of 60 m under the sea in kPa, if the density of seawater is 1,025 kg m−3. (1 kPa=1000 Pa and g=10 m s−2)615
Answer» Calculate the pressure at a depth of $60 m$ under the sea in $kPa$ , if the density of seawater is $1, 025 {kg m}^{- 3}$ . ( $1 kPa = 1000 Pa$ and $g = 10 {m s}^{- 2}$ ) 615

Discussion

2579.	A glass rod is rubbed with silk. Explain the charging of the glass rod and the silk on the basis of electron movement.
Answer» A glass rod is rubbed with silk. Explain the charging of the glass rod and the silk on the basis of electron movement.

Discussion

2580.	why does magnets repel similar poles (e.g.north and north) when they are brought close enough.
Answer» why does magnets repel similar poles (e.g.north and north) when they are brought close enough.

Discussion

2581.	Does electron move as a particle or wave or both as particle or wave simu†an eously.Expain with diagram
Answer» Does electron move as a particle or wave or both as particle or wave simu†an eously.Expain with diagram

Discussion

2582.	Which methods will you use to obtain salt from the sea water in salt pans − evaporation or distillation?
Answer» Which methods will you use to obtain salt from the sea water in salt pans − evaporation or distillation?

Discussion

2583.	Question 16 A gas filled balloon moves up. Is the upward force acting on it larger or smaller than the force of gravity?
Answer» Question 16 A gas filled balloon moves up. Is the upward force acting on it larger or smaller than the force of gravity?

Discussion

2584.	36.The density of a piece of clay is 1.8 in CGS system of units . The corresponding value in SI unit of system is ?
Answer» 36.The density of a piece of clay is 1.8 in CGS system of units . The corresponding value in SI unit of system is ?

Discussion

2585.	Which of the following is/are image?
Answer» Which of the following is/are image?

Discussion

2586.	order of polarizability Hg2+,Ag+,Pb2+?
Answer» order of polarizability Hg2+,Ag+,Pb2+?

Discussion

2587.	122.An object is projected from ground with speed u at an angle with the horizontal. Then the radius of its trajectory at its maximum height from ground is?
Answer» 122.An object is projected from ground with speed u at an angle with the horizontal. Then the radius of its trajectory at its maximum height from ground is?

Discussion

2588.	23.DerivAtion of kinetic energy of rolling motion
Answer» 23.DerivAtion of kinetic energy of rolling motion

Discussion

2589.	a force F vector=_k(yicap+xjcap)(where k is cons†an t)act on a particle moving in xy plane.starting from origin the particle is taken along y axis to point (0,a)the work done by agent applying the forceF on the particl o
Answer» a force F vector=_k(yicap+xjcap)(where k is cons†an t)act on a particle moving in xy plane.starting from origin the particle is taken along y axis to point (0,a)the work done by agent applying the forceF on the particl o

Discussion

2590.	If the amplitude of sound wave is doubled then the loudness will become:
Answer» If the amplitude of sound wave is doubled then the loudness will become:

Discussion

2591.	Why electric field line is more fundamental than electric field?
Answer» Why electric field line is more fundamental than electric field?

Discussion

2592.	When a balloon is rubbed with a piece of wool which type of charge does it acquire? Is it -ve or +ve?
Answer» When a balloon is rubbed with a piece of wool which type of charge does it acquire? Is it -ve or +ve?

Discussion

2593.	Draw a neat and labelled diagram of an electric bell and describe its working.
Answer» Draw a neat and labelled diagram of an electric bell and describe its working.

Discussion

2594.	What will happen if the wings of a aeroplane are bent towards the ground?
Answer» What will happen if the wings of a aeroplane are bent towards the ground?

Discussion

2595.	A given quantity of a liquid is heated. Which of the following quantities will vary and how?(a) mass (b) volume and (c) density.
Answer» A given quantity of a liquid is heated. Which of the following quantities will vary and how? (a) mass (b) volume and (c) density.

2595.

A given quantity of a liquid is heated. Which of the following quantities will vary and how?(a) mass (b) volume and (c) density.

Answer»

A given quantity of a liquid is heated. Which of the following quantities will vary and how?

(a) mass (b) volume and (c) density.

Discussion

2596.	The elastic limit of brass is 379 MPa. What should be the minimum diameter of a brass rod, if it is to support a 400 N ?
Answer» The elastic limit of brass is $379 MPa$ . What should be the minimum diameter of a brass rod, if it is to support a $400 N$ ?

Discussion

2597.	A square body has side 14 cm and mass 1080 g. The surface density of the body is
Answer» A square body has side $14 c m$ and mass $1080 g$ . The surface density of the body is

Discussion

2598.	Two charged particle A and B each having a charge Q are placed a distance d apart. Where should a third particle of q placed on the perpendicular bisector of AB so that it experiences maximum force? Also find the magnitude of the maximum force.
Answer» Two charged particle A and B each having a charge Q are placed a distance d apart. Where should a third particle of q placed on the perpendicular bisector of AB so that it experiences maximum force? Also find the magnitude of the maximum force.

Discussion

2599.	The loudness of a sound is a factor of
Answer» The loudness of a sound is a factor of

2599.

The loudness of a sound is a factor of

Answer»

The loudness of a sound is a factor of

Discussion

2600.	A 40μF capacitor in a defibrillator is charged to 3000 V. The energy stored in the capacitor is sent through the patient during a pulse of duration 2 ms. The power delivered to the patient is
Answer» A $40 μ F$ capacitor in a defibrillator is charged to $3000 V$ . The energy stored in the capacitor is sent through the patient during a pulse of duration $2 ms$ . The power delivered to the patient is

Discussion

Explore topic-wise InterviewSolutions in .

What is an electrolytic cell

22.Two point charges of +3microcoloumb +4microcoloumb repel each other with a force of 10N. If each is given an additional charge of -6microcoloumb, the new force is?

Figure shows a uniform rod of length 30 cm havinga mass 3.0 kg. The rod is pulled by constantforces of 20 N and 32 N as shown. Find the forceexerted by 20 cm part of the rod on the 10 cmpart (all surfaces are smooth) is24.20 N32 N10 cm 20 cm

Statement 1: The flow of current in a poor conductor is impossible. Statement 2: Under certain conditions, current can flow through a poor conductor.

The tones that are separated by three octaves have a frequency ratio of

Which of the following examples can be explained using Newton's first law of motion

A ball thrown vertically upwards with a speed of 19.6 m/s from the top of a tower returns to the base of tower in 6s. Find the height of tower : ( Assume accelaration due to gravity 9.8m/s2

Question 24You are provided with a magnetic compass, an empty matchbox, a battery of two cells and connecting wires. Using these objects how will you make a tester for testing an electric circuit? Draw the necessary circuit diagram and explain.

25, A ball of density and radius r is dropped on thesurface of a liquid of density p from certain height, ifspeed of ball does not change even on entering inliquid and viscosity of liquid is η , then the heightfrom which ball dropped is2 ,29η 2(o-p)r(3)--9η (4) 2g9η

Why do our ears ache when we travel by an aeroplane?

A u shaped wire is dipped in a soap solution and removed.The thin soap film formed between the wire and a light slider supports a weight of 1.5*10-2N.The l of the slider is 30cm.What is the surface tension of the film

Explain what happens when a negatively charged body is placed on the ground? [3 MARKS]

What is the frictional force exerted by fluids on objects moving through them known as?

an electron is rotating around an infinite positive linear charge in a circle of radius 0.1 m ,if the linear charge density is 1 microcoulomb /metre then the velocity of eletron in m/s will be what??

A horizontal plate has been joined to a vertical post using four rivets arranged as shown in the figure. the magnitude of the load on the worst loaded rivet (in N) is1839.83

What is the SI unit of power?

An unlabelled analog clock seen through a mirror shows two o'clock. What is the actual time shown by the clock?

What is aperture of a mirror?

121.Dimensions for li linear charge density

Four containers contain water at same height as shown. Rank them according to pressure exerted at the bottom of containers in ascending order.

65. what is electropositive and electronegative elements in redox reaction ?

Two iron rods - one 10 m long and the other 5 m long, are heated to the same rise in temperature. Which will expand more?

If the pressure of 7k pa is acting on the cube of10 cm what is the force?

(a) What is hypermetropia?(b) What are the causes of hypermetropia?(c) Name the lens used to correct hypermetropia?

If a rectangular tank of depth 8 metre is full of water μ=43, then the bottom is seen at a depth of___metres.

If the power factor of an AC RL circuit changes from 12 to 14 keeping resistance constant, what is the percentage change in the impedance of the circuit?

Calculate the pressure at a depth of 60 m under the sea in kPa, if the density of seawater is 1,025 kg m−3. (1 kPa=1000 Pa and g=10 m s−2)615

A glass rod is rubbed with silk. Explain the charging of the glass rod and the silk on the basis of electron movement.

why does magnets repel similar poles (e.g.north and north) when they are brought close enough.

Does electron move as a particle or wave or both as particle or wave simu†an eously.Expain with diagram

Which methods will you use to obtain salt from the sea water in salt pans − evaporation or distillation?

Question 16 A gas filled balloon moves up. Is the upward force acting on it larger or smaller than the force of gravity?

36.The density of a piece of clay is 1.8 in CGS system of units . The corresponding value in SI unit of system is ?

Which of the following is/are image?

order of polarizability Hg2+,Ag+,Pb2+?

122.An object is projected from ground with speed u at an angle with the horizontal. Then the radius of its trajectory at its maximum height from ground is?

23.DerivAtion of kinetic energy of rolling motion

a force F vector=_k(yicap+xjcap)(where k is cons†an t)act on a particle moving in xy plane.starting from origin the particle is taken along y axis to point (0,a)the work done by agent applying the forceF on the particl o

If the amplitude of sound wave is doubled then the loudness will become:

Why electric field line is more fundamental than electric field?

When a balloon is rubbed with a piece of wool which type of charge does it acquire? Is it -ve or +ve?

Draw a neat and labelled diagram of an electric bell and describe its working.

What will happen if the wings of a aeroplane are bent towards the ground?

A given quantity of a liquid is heated. Which of the following quantities will vary and how?(a) mass (b) volume and (c) density.

The elastic limit of brass is 379 MPa. What should be the minimum diameter of a brass rod, if it is to support a 400 N ?

A square body has side 14 cm and mass 1080 g. The surface density of the body is

Two charged particle A and B each having a charge Q are placed a distance d apart. Where should a third particle of q placed on the perpendicular bisector of AB so that it experiences maximum force? Also find the magnitude of the maximum force.

The loudness of a sound is a factor of

A 40μF capacitor in a defibrillator is charged to 3000 V. The energy stored in the capacitor is sent through the patient during a pulse of duration 2 ms. The power delivered to the patient is