9478 + Interview Questions in Physics Page 58 InterviewSolution

2851.	Which of the following statement is/are true (i) As long as a metal has some iron in it, you can magnetize it using a magnet (ii) A magnet is an oxide of iron, hence materials which have iron or is an oxide of iron can be made into a temporary magnet.
Answer» Which of the following statement is/are true (i) As long as a metal has some iron in it, you can magnetize it using a magnet (ii) A magnet is an oxide of iron, hence materials which have iron or is an oxide of iron can be made into a temporary magnet.

2851.

Which of the following statement is/are true (i) As long as a metal has some iron in it, you can magnetize it using a magnet (ii) A magnet is an oxide of iron, hence materials which have iron or is an oxide of iron can be made into a temporary magnet.

Answer»

Which of the following statement is/are true

(i) As long as a metal has some iron in it, you can magnetize it using a magnet

(ii) A magnet is an oxide of iron, hence materials which have iron or is an oxide of iron can be made into a temporary magnet.

Discussion

2852.	Three different vibrating objects produce three of sounds X, Y and Z. The sounds X and Y cannot be heard by a man having normal range of hearing but sound Z can be heard easily. The sound X can be heard by a bat whereas the sound Y can be heard by a rhinoceros. What type of sounds are X, Y and Z ?
Answer» Three different vibrating objects produce three of sounds X, Y and Z. The sounds X and Y cannot be heard by a man having normal range of hearing but sound Z can be heard easily. The sound X can be heard by a bat whereas the sound Y can be heard by a rhinoceros. What type of sounds are X, Y and Z ?

Discussion

2853.	A ray of light is incident on the interface between water and glass at an angle i and refracted parallel to the water surface, then value of ug , refractive index of glass will be:
Answer» A ray of light is incident on the interface between water and glass at an angle i and refracted parallel to the water surface, then value of ug , refractive index of glass will be:

Discussion

2854.	Mention three methods by which we can reduce friction between two bodies. [3 MARKS]
Answer» Mention three methods by which we can reduce friction between two bodies. [3 MARKS]

Discussion

2855.	When two balls, one of iron and the other of aluminium, are completely immersed in strong salty water, they undergo an equal loss in weight. This shows that iron and aluminium balls have :(1) the same densities(2) the same masses(3) the same volumes(4) the same weights
Answer» When two balls, one of iron and the other of aluminium, are completely immersed in strong salty water, they undergo an equal loss in weight. This shows that iron and aluminium balls have : (1) the same densities (2) the same masses (3) the same volumes (4) the same weights

Discussion

2856.	n equal resistances are first connected in series, and then the same n equal resistances are connected in parallel. The ratio of net resistance in series combination to that in parallel combination is[0.77 Mark]
Answer» $n$ equal resistances are first connected in series, and then the same $n$ equal resistances are connected in parallel. The ratio of net resistance in series combination to that in parallel combination is $[$ 0.77 Mark $]$

Discussion

2857.	Two identical cubes A and B are placed in a tank containing a liquid as shown below. Choose the correct statement regarding pressures exerted on them.
Answer» Two identical cubes A and B are placed in a tank containing a liquid as shown below. Choose the correct statement regarding pressures exerted on them.

Discussion

2858.	Two spherical conductors b and c having equal radii carrying equal charge repel each other with a force F when kept apart a distance . A third indemnify c spherical conductor initially in charged is brought in contact with b and with c and finally removed. Find the new force of repulsion between b and c
Answer» Two spherical conductors b and c having equal radii carrying equal charge repel each other with a force F when kept apart a distance . A third indemnify c spherical conductor initially in charged is brought in contact with b and with c and finally removed. Find the new force of repulsion between b and c

Discussion

2859.	Is there any way to identify the Direction of friction in pure rolling and rolling motion instantly??
Answer» Is there any way to identify the Direction of friction in pure rolling and rolling motion instantly??

Discussion

2860.	What is overloading
Answer» What is overloading

Discussion

2861.	power unit is 1kwatt length 100m time is 1s what will be the unit of mass
Answer» power unit is 1kwatt length 100m time is 1s what will be the unit of mass

Discussion

2862.	If the two terminals of a battery of 21 V is connected across A and B, the charge flown through the battery will beGiven:C1=2pF,C2=13 pF,C3=6 pFC4=1pFandC5=12 pF
Answer» If the two terminals of a battery of $21 V$ is connected across $A$ and $B$ , the charge flown through the battery will be $G i v e n : C_{1} = 2 pF, C_{2} = 13 pF, C_{3} = 6 pF C_{4} = 1 pF and C_{5} = 12 pF$

Discussion

2863.	When a capillary tube is immersed in a liquid the liquid of mass M rises in the capillary tube if the capillary tube of double radius is taken the mass of the same leg rising in the tube is
Answer» When a capillary tube is immersed in a liquid the liquid of mass M rises in the capillary tube if the capillary tube of double radius is taken the mass of the same leg rising in the tube is

Discussion

2864.	Question 25 If 1 m2=x mm2, then the value of x is (a) 1000 (b) 10000 (c) 100000 (d) 1000000
Answer» Question 25 If $1 m^{2} = x m m^{2},$ then the value of x is (a) 1000 (b) 10000 (c) 100000 (d) 1000000

Discussion

2865.	The planet nearest to the sun is ____.
Answer» The planet nearest to the sun is ____.

Discussion

2866.	What causes the charging of two objects when they are rubbed together?
Answer» What causes the charging of two objects when they are rubbed together?

Discussion

2867.	A stone is dropped from the top of a tower and travels 24.5m in the last second of its journey.The height of the tower is____
Answer» A stone is dropped from the top of a tower and travels 24.5m in the last second of its journey.The height of the tower is____

Discussion

2868.	7.1) if distance between the sun and the earth is increased by three times then attraction between two will 1) decreases by 63% 2) decreases by 89%
Answer» 7.1) if distance between the sun and the earth is increased by three times then attraction between two will 1) decreases by 63% 2) decreases by 89%

Discussion

2869.	A uniform rope of length L is pulled by a constant force F.what is the tension in the rope at a distance l from the end where the force is applied
Answer» A uniform rope of length L is pulled by a constant force F.what is the tension in the rope at a distance l from the end where the force is applied

Discussion

2870.	Why does the moon shine at night?
Answer» Why does the moon shine at night?

Discussion

2871.	Define:(i) Focus(ii) Focal length, for a spherical mirror. If the focal length of a convex mirror is 20 cm, find its radius of curvature.
Answer» Define: (i) Focus (ii) Focal length, for a spherical mirror. If the focal length of a convex mirror is $20 cm$ , find its radius of curvature.

Discussion

2872.	Question 22Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2 Ω in series with a combination of two resistors (4 Ω each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2 Ω resistors be the same as that across the parallel combination of 4Ω resistors? Give reason.
Answer» Question 22 Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2 $Ω$ in series with a combination of two resistors (4 $Ω$ each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2 $Ω$ resistors be the same as that across the parallel combination of 4 $Ω$ resistors? Give reason.

Discussion

2873.	3 Prove that root5+root7 is irrational
Answer» 3 Prove that root5+root7 is irrational

Discussion

2874.	21. The metal that cannot be obtained by electrolysis of an aqua solution of its salt is
Answer» 21. The metal that cannot be obtained by electrolysis of an aqua solution of its salt is

Discussion

2875.	Explain with four examples that sometimes, force of friction is desirable.
Answer» Explain with four examples that sometimes, force of friction is desirable.

Discussion

2876.	Why 3 rd harmonic is called 1 st overtone and 5 th harmonic is called 2 nd overtone?
Answer» Why 3 rd harmonic is called 1 st overtone and 5 th harmonic is called 2 nd overtone?

Discussion

2877.	What could happen if I threw the light on the mirror along the normal?
Answer» What could happen if I threw the light on the mirror along the normal?

Discussion

2878.	What is the name of a small opening in the iris of an eye?
Answer» What is the name of a small opening in the iris of an eye?

Discussion

2879.	A charge Q is uniformiy distributed over a semi-circular ring of radius R. A point charge q is kepton the center of semi-circular ring as shown. Theelectrostatic force experienced by the point chargein given arrangement is
Answer» A charge Q is uniformiy distributed over a semi-circular ring of radius R. A point charge q is kepton the center of semi-circular ring as shown. Theelectrostatic force experienced by the point chargein given arrangement is

Discussion

2880.	How many reflected rays can there be for a given single incident ray falling on a plane mirror?
Answer» How many reflected rays can there be for a given single incident ray falling on a plane mirror?

Discussion

2881.	The diagram shows a graph of the sound wave given out by a tuning fork. Trace it on a graph paper and draw graphs to show:1. Louder sound of the same pitch.2. Sound of the same loudness but greater pitch3. Sound that is louder and also has greater pitch
Answer» The diagram shows a graph of the sound wave given out by a tuning fork. Trace it on a graph paper and draw graphs to show: 1. Louder sound of the same pitch. 2. Sound of the same loudness but greater pitch 3. Sound that is louder and also has greater pitch

Discussion

2882.	Consider the following statements and choose the correct option.1. Magnetic field lines form closed loops.2. No two field lines intersect
Answer» Consider the following statements and choose the correct option. 1. Magnetic field lines form closed loops. 2. No two field lines intersect

Discussion

2883.	Question 10Where do we apply a force while walking?
Answer» Question 10 Where do we apply a force while walking?

Discussion

2884.	A positive surge of height 0.60 m occurs in a rectangular channel with a depth of 1.8 m. The celerity of surge (in ms) is5.2
Answer» A positive surge of height 0.60 m occurs in a rectangular channel with a depth of 1.8 m. The celerity of surge (in $\frac{m}{s})$ is 5.2

Discussion

2885.	Is ac current is used for charging a capacitor
Answer» Is ac current is used for charging a capacitor

Discussion

2886.	Why can't plane mirror be used for rear view mirror?
Answer» Why can't plane mirror be used for rear view mirror?

Discussion

2887.	why isthe mass of moon in 1/6?
Answer» why isthe mass of moon in 1/6?

Discussion

2888.	Explain why sliding friction is less than static friction?
Answer» Explain why sliding friction is less than static friction?

Discussion

2889.	In an electric circuit, the positive terminal of the electric cell is marked P and the negative terminal is marked N. What is the direction of flow of current in the circuit?
Answer» In an electric circuit, the positive terminal of the electric cell is marked P and the negative terminal is marked N. What is the direction of flow of current in the circuit?

Discussion

2890.	29.Why vapour density of fully dissociated NH_4Cl is half the vapour density of pure NH_4Cl??
Answer» 29.Why vapour density of fully dissociated NH_4Cl is half the vapour density of pure NH_4Cl??

Discussion

2891.	We cannot see air pressure but we know it exists. This is because
Answer» We cannot see air pressure but we know it exists. This is because

Discussion

2892.	Which of these is not an organ system?(a) lung(b) circulatory(c) digestive(d) excretory
Answer» Which of these is not an organ system? (a) lung (b) circulatory (c) digestive (d) excretory

Discussion

2893.	An object at rest starts moving and attains a velocity of 10 ms−1 after 5 s. What is the acceleration?
Answer» An object at rest starts moving and attains a velocity of $10 m s^{- 1}$ after 5 s. What is the acceleration?

Discussion

2894.	Question 03.3 Mention in the following case whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer. Cardboard surface
Answer» Question 03.3 Mention in the following case whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer. Cardboard surface

Discussion

2895.	How many Earth years does it take for Mars to go around the Sun?
Answer» How many Earth years does it take for Mars to go around the Sun?

Discussion

2896.	In the movie gravity, astronauts Sandra Bullock & George Clooney are stranded in space and connected by a string. To come closer to each other they both start pulling the string from their ends. Assuming that if the astronauts are pulling the string with a force F then the tension in the string should be equal and in opposite direction and should pull the astronaut (According to Newton's 3rd law).Then in that case the net force on each astronaut should be 0 and they shouldn't move according to 1st law. Why are the moving towards each other?
Answer» In the movie gravity, astronauts Sandra Bullock & George Clooney are stranded in space and connected by a string. To come closer to each other they both start pulling the string from their ends. Assuming that if the astronauts are pulling the string with a force F then the tension in the string should be equal and in opposite direction and should pull the astronaut (According to Newton's 3rd law). Then in that case the net force on each astronaut should be 0 and they shouldn't move according to 1st law. Why are the moving towards each other?

2896.

In the movie gravity, astronauts Sandra Bullock & George Clooney are stranded in space and connected by a string. To come closer to each other they both start pulling the string from their ends. Assuming that if the astronauts are pulling the string with a force F then the tension in the string should be equal and in opposite direction and should pull the astronaut (According to Newton's 3rd law).Then in that case the net force on each astronaut should be 0 and they shouldn't move according to 1st law. Why are the moving towards each other?

Answer»

In the movie gravity, astronauts Sandra Bullock & George Clooney are stranded in space and connected by a string. To come closer to each other they both start pulling the string from their ends. Assuming that if the astronauts are pulling the string with a force F then the tension in the string should be equal and in opposite direction and should pull the astronaut (According to Newton's 3rd law).

Then in that case the net force on each astronaut should be 0 and they shouldn't move according to 1st law. Why are the moving towards each other?

Discussion

2897.	The pressure acting on a bolt at a depth of 6 cm in a liquid of 1420 kilogram per cubic metre, is.
Answer» The pressure acting on a bolt at a depth of 6 cm in a liquid of 1420 kilogram per cubic metre, is.

Discussion

2898.	A lens has a focal length 10cm.An object is placed in front of it. Where should a convex mirror placed so that image is formed at the object itself,when a focal length of a convex mirroris 12cm.? 1) 4cm from lens 2) 6cm from len
Answer» A lens has a focal length 10cm.An object is placed in front of it. Where should a convex mirror placed so that image is formed at the object itself,when a focal length of a convex mirroris 12cm.? 1) 4cm from lens 2) 6cm from len

Discussion

2899.	Find G.C.D of 2^{60}-1 , 2^{50}-1 .
Answer» Find G.C.D of 2^{60}-1 , 2^{50}-1 .

Discussion

2900.	In two triangles ABC and PQR,Given that and, which of the following is true?
Answer» In two triangles ABC and PQR,Given that and, which of the following is true?

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following statement is/are true (i) As long as a metal has some iron in it, you can magnetize it using a magnet (ii) A magnet is an oxide of iron, hence materials which have iron or is an oxide of iron can be made into a temporary magnet.

Three different vibrating objects produce three of sounds X, Y and Z. The sounds X and Y cannot be heard by a man having normal range of hearing but sound Z can be heard easily. The sound X can be heard by a bat whereas the sound Y can be heard by a rhinoceros. What type of sounds are X, Y and Z ?

A ray of light is incident on the interface between water and glass at an angle i and refracted parallel to the water surface, then value of ug , refractive index of glass will be: ￼

Mention three methods by which we can reduce friction between two bodies. [3 MARKS]

When two balls, one of iron and the other of aluminium, are completely immersed in strong salty water, they undergo an equal loss in weight. This shows that iron and aluminium balls have :(1) the same densities(2) the same masses(3) the same volumes(4) the same weights

n equal resistances are first connected in series, and then the same n equal resistances are connected in parallel. The ratio of net resistance in series combination to that in parallel combination is[0.77 Mark]

Two identical cubes A and B are placed in a tank containing a liquid as shown below. Choose the correct statement regarding pressures exerted on them.

Is there any way to identify the Direction of friction in pure rolling and rolling motion instantly??

What is overloading

power unit is 1kwatt length 100m time is 1s what will be the unit of mass

If the two terminals of a battery of 21 V is connected across A and B, the charge flown through the battery will beGiven:C1=2pF,C2=13 pF,C3=6 pFC4=1pFandC5=12 pF

When a capillary tube is immersed in a liquid the liquid of mass M rises in the capillary tube if the capillary tube of double radius is taken the mass of the same leg rising in the tube is

Question 25 If 1 m2=x mm2, then the value of x is (a) 1000 (b) 10000 (c) 100000 (d) 1000000

The planet nearest to the sun is ____.

What causes the charging of two objects when they are rubbed together?

A stone is dropped from the top of a tower and travels 24.5m in the last second of its journey.The height of the tower is____

7.1) if distance between the sun and the earth is increased by three times then attraction between two will 1) decreases by 63% 2) decreases by 89%

A uniform rope of length L is pulled by a constant force F.what is the tension in the rope at a distance l from the end where the force is applied

Why does the moon shine at night?

Define:(i) Focus(ii) Focal length, for a spherical mirror. If the focal length of a convex mirror is 20 cm, find its radius of curvature.

3 Prove that root5+root7 is irrational

21. The metal that cannot be obtained by electrolysis of an aqua solution of its salt is

Explain with four examples that sometimes, force of friction is desirable.

Why 3 rd harmonic is called 1 st overtone and 5 th harmonic is called 2 nd overtone?

What could happen if I threw the light on the mirror along the normal?

What is the name of a small opening in the iris of an eye?

A charge Q is uniformiy distributed over a semi-circular ring of radius R. A point charge q is kepton the center of semi-circular ring as shown. Theelectrostatic force experienced by the point chargein given arrangement is

How many reflected rays can there be for a given single incident ray falling on a plane mirror?

The diagram shows a graph of the sound wave given out by a tuning fork. Trace it on a graph paper and draw graphs to show:1. Louder sound of the same pitch.2. Sound of the same loudness but greater pitch​3. Sound that is louder and also has greater pitch

Consider the following statements and choose the correct option.1. Magnetic field lines form closed loops.2. No two field lines intersect

Question 10Where do we apply a force while walking?

A positive surge of height 0.60 m occurs in a rectangular channel with a depth of 1.8 m. The celerity of surge (in ms) is5.2

Is ac current is used for charging a capacitor

Why can't plane mirror be used for rear view mirror?

why isthe mass of moon in 1/6?

Explain why sliding friction is less than static friction?

In an electric circuit, the positive terminal of the electric cell is marked P and the negative terminal is marked N. What is the direction of flow of current in the circuit?

29.Why vapour density of fully dissociated NH_4Cl is half the vapour density of pure NH_4Cl??

We cannot see air pressure but we know it exists. This is because

Which of these is not an organ system?(a) lung(b) circulatory(c) digestive(d) excretory

An object at rest starts moving and attains a velocity of 10 ms−1 after 5 s. What is the acceleration?

Question 03.3 Mention in the following case whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer. Cardboard surface

How many Earth years does it take for Mars to go around the Sun?

The pressure acting on a bolt at a depth of 6 cm in a liquid of 1420 kilogram per cubic metre, is.

A lens has a focal length 10cm.An object is placed in front of it. Where should a convex mirror placed so that image is formed at the object itself,when a focal length of a convex mirroris 12cm.? 1) 4cm from lens 2) 6cm from len

Find G.C.D of 2^{60}-1 , 2^{50}-1 .

In two triangles ABC and PQR,Given that and, which of the following is true?

A ray of light is incident on the interface between water and glass at an angle i and refracted parallel to the water surface, then value of ug , refractive index of glass will be:

The diagram shows a graph of the sound wave given out by a tuning fork. Trace it on a graph paper and draw graphs to show:1. Louder sound of the same pitch.2. Sound of the same loudness but greater pitch3. Sound that is louder and also has greater pitch