13232 + Interview Questions in Physics Page 91 InterviewSolution

4501.	A sound wave has a frequency of 1000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?
Answer» A sound wave has a frequency of $1000 H z$ and a wavelength of $34 c m$ . How long will it take to travel $1 k m$ ?

Discussion

4502.	69. Two trains each 50 m long travelling in opposite direction with velocity 10 m/s and 15 m/s per .The time of crossing is:
Answer» 69. Two trains each 50 m long travelling in opposite direction with velocity 10 m/s and 15 m/s per .The time of crossing is:

Discussion

4503.	In the following circuit diagram, the potential of points A,B and C are 10 V,20 V and 20 V respectively. The potential of the junction O is[0.77 Mark]
Answer» In the following circuit diagram, the potential of points $A, B$ and $C$ are $10 V, 20 V$ and $20 V$ respectively. The potential of the junction $O$ is $[$ 0.77 Mark $]$

Discussion

4504.	Why does a sharp knife cut objects more effectively than a blunt knife ?
Answer» Why does a sharp knife cut objects more effectively than a blunt knife ?

Discussion

4505.	Write answers to the following questions:(a) Distinguish between the two methods of making artificial magnets.(b) Which substances are used for making electromagnets?(c) Write a note on 'magnetic field'.(d) Why is a magnetic needle used in a compass?(e) Explain with the help of a diagram how the intensity and direction of the magnetic field of a bar magnet can be determined.
Answer» Write answers to the following questions: (a) Distinguish between the two methods of making artificial magnets. (b) Which substances are used for making electromagnets? (c) Write a note on 'magnetic field'. (d) Why is a magnetic needle used in a compass? (e) Explain with the help of a diagram how the intensity and direction of the magnetic field of a bar magnet can be determined.

Discussion

4506.	The density of a solid metal sphere is determined by measuring its mass and its diameter, the maximum error in the density of the sphere is (x100)%. If the relative errors in measuring the mass and the diameter are 6.0 % and 1.5 % respectively, the value of x is
Answer» The density of a solid metal sphere is determined by measuring its mass and its diameter, the maximum error in the density of the sphere is $(\frac{x}{100})$ %. If the relative errors in measuring the mass and the diameter are $6.0 %$ and $1.5 %$ respectively, the value of $x$ is

Discussion

4507.	What type of motion, uniform or non-uniform, is exhibited by a freely falling body? Give reason for your answer.
Answer» What type of motion, uniform or non-uniform, is exhibited by a freely falling body? Give reason for your answer.

Discussion

4508.	Use the following information to answer the next question. Arun has a combination of two plane mirrors, M1 and M2. The mirrors are placed at an angle θ with each other, as shown in the given figure. A light ray is incident on M1, with the incident angle being 20°. For what value of , will angle be 30°?
Answer» Use the following information to answer the next question. Arun has a combination of two plane mirrors, M₁ and M₂. The mirrors are placed at an angle θ with each other, as shown in the given figure. A light ray is incident on M₁, with the incident angle being 20°. For what value of , will angle be 30°?

4508.

Use the following information to answer the next question. Arun has a combination of two plane mirrors, M1 and M2. The mirrors are placed at an angle θ with each other, as shown in the given figure. A light ray is incident on M1, with the incident angle being 20°. For what value of , will angle be 30°?

Answer»

Use the following information to answer the next question.

Arun has a combination of two plane mirrors, M₁ and M₂. The mirrors are placed at an angle θ with each other, as shown in the given figure.

A light ray is incident on M₁, with the incident angle being 20°.

For what value of , will angle be 30°?

Discussion

4509.	What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis?
Answer» What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis?

Discussion

4510.	Question 11The calorific value of a fuel is expressed in a unit called(a) kilojoule per litre(b) kilogram per mililitre(c) kilojoule per gram(d) kilojoule per kilogram
Answer» Question 11 The calorific value of a fuel is expressed in a unit called (a) kilojoule per litre (b) kilogram per mililitre (c) kilojoule per gram (d) kilojoule per kilogram

Discussion

4511.	Is work a scalar or a vector quantity ?
Answer» Is work a scalar or a vector quantity ?

Discussion

4512.	The 'Professor' knew too much. How did he prove himself? Fill up the space with suitable examples from the story, using the given clues: about muzzle velocity:
Answer» The 'Professor' knew too much. How did he prove himself? Fill up the space with suitable examples from the story, using the given clues: about muzzle velocity:

4512.

The 'Professor' knew too much. How did he prove himself? Fill up the space with suitable examples from the story, using the given clues: about muzzle velocity:

Answer»

The
'Professor' knew too much. How did he prove himself? Fill up the
space with suitable examples from the story, using the given clues:

about
muzzle velocity:

Discussion

4513.	How can we build invisible containers for plasma ? (2 marks)
Answer» How can we build invisible containers for plasma ? (2 marks)

4513.

How can we build invisible containers for plasma ? (2 marks)

Answer»

How can we build invisible containers for plasma ?

(2 marks)

Discussion

4514.	A nucleus X220 at rest decays by emitting an α particle. If energy of the daughter nucleus is 0.2 MeV, then the Q value of the reaction is
Answer» A nucleus $X^{220}$ at rest decays by emitting an $α$ particle. If energy of the daughter nucleus is $0.2 MeV$ , then the $Q$ value of the reaction is

Discussion

4515.	a boy stands 60 m infront of a wall and claps . he continues to clap every time an echo is heard . another boy finds that time taken between 1st and 51st clap is 20s find the speed of sound in air .
Answer» a boy stands 60 m infront of a wall and claps . he continues to clap every time an echo is heard . another boy finds that time taken between 1st and 51st clap is 20s find the speed of sound in air .

Discussion

4516.	if earth suddenly stop rotating, then the weight of an object of mass m at equator will \lbrackω is angular speed of earth andR
Answer» if earth suddenly stop rotating, then the weight of an object of mass m at equator will \lbrackω is angular speed of earth andR

Discussion

4517.	Show how you would connect three resistors, each of resistance 6Ω, so that thecombination has a resistance of (i) 9Ω (ii) 2Ω
Answer» Show how you would connect three resistors, each of resistance $6 Ω$ , so that the combination has a resistance of (i) $9 Ω$ (ii) $2 Ω$

Discussion

4518.	the capacitance of a spherical condenser whose inner sphere is grounded is 1 microfarad.if the spacing between the two spheres is 1 mm then what is the radius of the outer sphere
Answer» the capacitance of a spherical condenser whose inner sphere is grounded is 1 microfarad.if the spacing between the two spheres is 1 mm then what is the radius of the outer sphere

Discussion

4519.

pot caught cook boon dot bought hook soon cot taught book moon hot fought took spoon

Answer»

pot	caught	cook	boon
dot	bought	hook	soon
cot	taught	book	moon
hot	fought	took	spoon

Discussion

4520.	Position of a moving object with acceleration 'a' is given by x=Ka^mt^n, here t is time . the values of m and n are given as (K is dimensionless )
Answer» Position of a moving object with acceleration 'a' is given by x=Ka^mt^n, here t is time . the values of m and n are given as (K is dimensionless )

Discussion

4521.	The fundamental frequency of a closed organ pipe is equal to the first overtone frequency of an open organ pipe. If the length of the open pipe is 60 cm, what is the length of the closed pipe?
Answer» The fundamental frequency of a closed organ pipe is equal to the first overtone frequency of an open organ pipe. If the length of the open pipe is $60 cm$ , what is the length of the closed pipe?

Discussion

4522.	'' Boat man tie the boat to a nearby tree to avoid the tendency of boat to slip back water when the passengers alight from the boat'' Pair of particular law and one more activity to above incident is: A Newton's third law of motion: flying bird B Newton's third law of motion :ball bouncing back after hitting the wall C Newton's second law of motion: launched rocket D Newton's first law of motion :bullet triggered fro m a gun
Answer» '' Boat man tie the boat to a nearby tree to avoid the tendency of boat to slip back water when the passengers alight from the boat'' Pair of particular law and one more activity to above incident is: A Newton's third law of motion: flying bird B Newton's third law of motion :ball bouncing back after hitting the wall C Newton's second law of motion: launched rocket D Newton's first law of motion :bullet triggered fro m a gun

Discussion

4523.	A body goes from C to D with a velocity of 20m/s and comes back from D to C with a velocity of 30m/s. The average velocity of the body during the whole journey is:
Answer» A body goes from C to D with a velocity of $20 m / s$ and comes back from D to C with a velocity of $30 m / s$ . The average velocity of the body during the whole journey is:

Discussion

4524.	A galvanometer of 50 ohms resistance has2.25 divisions. A current of 4 x104 amperes givesa deflection of one division. To convert thisgalvanometer into a voltmeter having a rangeof 25 volts, it should be connected with aresistance of:-(1) 2450 Ω in parallel (2) 2550 Ω in series(3) 2450 Ω in series(4) 2500(2 in parallel
Answer» A galvanometer of 50 ohms resistance has2.25 divisions. A current of 4 x104 amperes givesa deflection of one division. To convert thisgalvanometer into a voltmeter having a rangeof 25 volts, it should be connected with aresistance of:-(1) 2450 Ω in parallel (2) 2550 Ω in series(3) 2450 Ω in series(4) 2500(2 in parallel

Discussion

4525.	The number of significant figures in 50000.020×10−3 is ______.
Answer» The number of significant figures in $50000.020 \times 10^{- 3}$ is ______.

Discussion

4526.	1. What is the mass of an object whose weight is 49 N? 2.State three Kepler's law of planetary motion. [5 MARKS]
Answer» 1. What is the mass of an object whose weight is 49 N? 2.State three Kepler's law of planetary motion. [5 MARKS]

Discussion

4527.	What is mechanical wave?
Answer» What is mechanical wave?

Discussion

4528.	A 10 kg iron dumbbell is dropped from a height of 80 cm onto a stone floor. If the dumbbell comes to rest after hitting the floor, how much momentum (in kg m s−1 ) will the floor acquire? Take the acceleration caused in the dumbbell due to gravity, to be 10 m s−240
Answer» A $10 kg$ iron dumbbell is dropped from a height of $80 cm$ onto a stone floor. If the dumbbell comes to rest after hitting the floor, how much momentum (in ${kg m s}^{- 1}$ ) will the floor acquire? Take the acceleration caused in the dumbbell due to gravity, to be $10 {m s}^{- 2}$ 40

Discussion

4529.	Calculate the resistance of an aluminium wire of length 50 cm and cross-sectional area 2.0 mm2. The resistivity of aluminium is 2.6×10−8 Ωm.
Answer» Calculate the resistance of an aluminium wire of length $50 cm$ and cross-sectional area $2.0 {mm}^{2}$ . The resistivity of aluminium is $2.6 \times 10^{- 8} Ω m$ .

Discussion

4530.	a bubble is exhaled by a man 45 m under water had 1 cm as radius it went up and burst what is radius of bubble at time of bursting
Answer» a bubble is exhaled by a man 45 m under water had 1 cm as radius it went up and burst what is radius of bubble at time of bursting

Discussion

4531.	The water level in a beaker rises by 200 ml when 10 marbles are dropped in it. What will be the volume of 30 marbles (in cu cm) ?
Answer» The water level in a beaker rises by 200 ml when 10 marbles are dropped in it. What will be the volume of 30 marbles (in cu cm) ?

Discussion

4532.	A body of mass 5 kg is moving with an acceleration of 5 ms-2 gets a displacement of 2m, the work done by the force is:
Answer» A body of mass 5 kg is moving with an acceleration of 5 ms^-2 gets a displacement of 2m, the work done by the force is:

Discussion

4533.	27.A body mass 5kg is acted upon by two perpendicular forces 8n and 6n give the magnitude and direction of the acceleration of the body
Answer» 27.A body mass 5kg is acted upon by two perpendicular forces 8n and 6n give the magnitude and direction of the acceleration of the body

Discussion

4534.	As shown in the figure, a rod is moving with velocity, v=20 m/s. For the rod to move with constant velocity, we must need to apply an external force in the right direction. What is the value of this external force?Given: Magnetic field, B=3 T and length of the rod, l=1 m.Assume resistance of the rod and connecting wires to be small.
Answer» As shown in the figure, a rod is moving with velocity, $v = 20 m/s$ . For the rod to move with constant velocity, we must need to apply an external force in the right direction. What is the value of this external force? Given: Magnetic field, $B = 3 T$ and length of the rod, $l = 1 m$ . Assume resistance of the rod and connecting wires to be small.

Discussion

4535.	23 Density of ice is 0.921 g cm calculate mass of cubic block of side 76 mm of each side
Answer» 23 Density of ice is 0.921 g cm calculate mass of cubic block of side 76 mm of each side

Discussion

4536.	Weight of an object is ___.
Answer» Weight of an object is ___.

Discussion

4537.	Find magnetic moment due to a hollow charged sphere.
Answer» Find magnetic moment due to a hollow charged sphere.

Discussion

4538.	Question 5From the given v – t graph (Fig.), it can be inferred that the object is(a) in uniform motion(b) at rest(c) in non-uniform motion(d) moving with uniform acceleration
Answer» Question 5 From the given v – t graph (Fig.), it can be inferred that the object is (a) in uniform motion (b) at rest (c) in non-uniform motion (d) moving with uniform acceleration

Discussion

4539.	Find the surface energy of water kept in a cylindrical vessel of radius 6 cm. Surface tension of water = 0.075 J/m2
Answer» Find the surface energy of water kept in a cylindrical vessel of radius 6 cm. Surface tension of water = 0.075 J/m²

Discussion

4540.	The electrical resistivity of a given metallic wire depends upon:
Answer» The electrical resistivity of a given metallic wire depends upon:

Discussion

4541.	a block of lead has dimensions of 4.50cm by 5.20cm by 6.00cm. the block weighs 1587g. from this information, calculate the density of lead in g/cm^3
Answer» a block of lead has dimensions of 4.50cm by 5.20cm by 6.00cm. the block weighs 1587g. from this information, calculate the density of lead in g/cm^3

Discussion

4542.	Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?
Answer» Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?

Discussion

4543.	A car is moving on a circular road of radius r 150 m and its speed is increasing at a rate 8 m/s2. At someinstant its speed is 30 m/s, net acceleration of the car at this instant is(1) 8 m/s2(2) 6 m/s2(3) 10 m/s2(4) 14 m/s2
Answer» A car is moving on a circular road of radius r 150 m and its speed is increasing at a rate 8 m/s2. At someinstant its speed is 30 m/s, net acceleration of the car at this instant is(1) 8 m/s2(2) 6 m/s2(3) 10 m/s2(4) 14 m/s2

Discussion

4544.	The least count of the ammeter shown below is :(1) 0.05 A(2) 0.5 A(3) 0.1 A(4) 1 A
Answer» The least count of the ammeter shown below is : (1) 0.05 A (2) 0.5 A (3) 0.1 A (4) 1 A

Discussion

4545.	11. Two metailic sphere of mass M are suspended by two strings each of length L. The distance betw upper ends of strings is L. The angle which the strings will make with the vertical due to mutual a ttraction sphere is (if each mass horizontally moved by a distance of due to mutual attraction) -11 GM gL ,GM 2gL (2) tan GM 4GM (4) tan gl2
Answer» 11. Two metailic sphere of mass M are suspended by two strings each of length L. The distance betw upper ends of strings is L. The angle which the strings will make with the vertical due to mutual a ttraction sphere is (if each mass horizontally moved by a distance of due to mutual attraction) -11 GM gL ,GM 2gL (2) tan GM 4GM (4) tan gl2

Discussion

4546.	Match the following derived quantities with their corresponding symbols of units.
Answer» Match the following derived quantities with their corresponding symbols of units.

Discussion

4547.	The force required just to move a body up an inclined plane is double the force required just to prevent the body sliding down. If the coefficient of friction is 0.25, the angle of inclination of the plane is
Answer» The force required just to move a body up an inclined plane is double the force required just to prevent the body sliding down. If the coefficient of friction is 0.25, the angle of inclination of the plane is

Discussion

4548.	Question 2A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is,(a) u2(b) u22g(c) u2g(d) u2g
Answer» Question 2 A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is, (a) $\frac{u}{2}$ (b) $\frac{u^{2}}{2 g}$ (c) $\frac{u^{2}}{g}$ (d) $\frac{u}{2 g}$

Discussion

4549.	A molecule of mass m of an ideal gas collides with the wall of the vessel with the velocity v and returns back with the same velocity. The change in the linear momentum of the molecule will be
Answer» A molecule of mass m of an ideal gas collides with the wall of the vessel with the velocity v and returns back with the same velocity. The change in the linear momentum of the molecule will be

Discussion

4550.	What does the acronym SONAR stand for?
Answer» What does the acronym SONAR stand for?

Discussion

Explore topic-wise InterviewSolutions in .

A sound wave has a frequency of 1000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?

69. Two trains each 50 m long travelling in opposite direction with velocity 10 m/s and 15 m/s per .The time of crossing is:

In the following circuit diagram, the potential of points A,B and C are 10 V,20 V and 20 V respectively. The potential of the junction O is[0.77 Mark]

Why does a sharp knife cut objects more effectively than a blunt knife ?

The density of a solid metal sphere is determined by measuring its mass and its diameter, the maximum error in the density of the sphere is (x100)%. If the relative errors in measuring the mass and the diameter are 6.0 % and 1.5 % respectively, the value of x is

What type of motion, uniform or non-uniform, is exhibited by a freely falling body? Give reason for your answer.

What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis?

Question 11The calorific value of a fuel is expressed in a unit called(a) kilojoule per litre(b) kilogram per mililitre(c) kilojoule per gram(d) kilojoule per kilogram

Is work a scalar or a vector quantity ?

The 'Professor' knew too much. How did he prove himself? Fill up the space with suitable examples from the story, using the given clues: about muzzle velocity:

How can we build invisible containers for plasma ? (2 marks)

A nucleus X220 at rest decays by emitting an α particle. If energy of the daughter nucleus is 0.2 MeV, then the Q value of the reaction is

a boy stands 60 m infront of a wall and claps . he continues to clap every time an echo is heard . another boy finds that time taken between 1st and 51st clap is 20s find the speed of sound in air .

if earth suddenly stop rotating, then the weight of an object of mass m at equator will \lbrackω is angular speed of earth andR

Show how you would connect three resistors, each of resistance 6Ω, so that thecombination has a resistance of (i) 9Ω (ii) 2Ω

the capacitance of a spherical condenser whose inner sphere is grounded is 1 microfarad.if the spacing between the two spheres is 1 mm then what is the radius of the outer sphere

pot caught cook boon dot bought hook soon cot taught book moon hot fought took spoon

Position of a moving object with acceleration 'a' is given by x=Ka^mt^n, here t is time . the values of m and n are given as (K is dimensionless )

The fundamental frequency of a closed organ pipe is equal to the first overtone frequency of an open organ pipe. If the length of the open pipe is 60 cm, what is the length of the closed pipe?

A body goes from C to D with a velocity of 20m/s and comes back from D to C with a velocity of 30m/s. The average velocity of the body during the whole journey is:

The number of significant figures in 50000.020×10−3 is ______.

1. What is the mass of an object whose weight is 49 N? 2.State three Kepler's law of planetary motion. [5 MARKS]

What is mechanical wave?

A 10 kg iron dumbbell is dropped from a height of 80 cm onto a stone floor. If the dumbbell comes to rest after hitting the floor, how much momentum (in kg m s−1 ) will the floor acquire? Take the acceleration caused in the dumbbell due to gravity, to be 10 m s−240

Calculate the resistance of an aluminium wire of length 50 cm and cross-sectional area 2.0 mm2. The resistivity of aluminium is 2.6×10−8 Ωm.

a bubble is exhaled by a man 45 m under water had 1 cm as radius it went up and burst what is radius of bubble at time of bursting

The water level in a beaker rises by 200 ml when 10 marbles are dropped in it. What will be the volume of 30 marbles (in cu cm) ?

A body of mass 5 kg is moving with an acceleration of 5 ms-2 gets a displacement of 2m, the work done by the force is:

27.A body mass 5kg is acted upon by two perpendicular forces 8n and 6n give the magnitude and direction of the acceleration of the body

23 Density of ice is 0.921 g cm calculate mass of cubic block of side 76 mm of each side

Weight of an object is ___.

Find magnetic moment due to a hollow charged sphere.

Question 5From the given v – t graph (Fig.), it can be inferred that the object is(a) in uniform motion(b) at rest(c) in non-uniform motion(d) moving with uniform acceleration

Find the surface energy of water kept in a cylindrical vessel of radius 6 cm. Surface tension of water = 0.075 J/m2

The electrical resistivity of a given metallic wire depends upon:

a block of lead has dimensions of 4.50cm by 5.20cm by 6.00cm. the block weighs 1587g. from this information, calculate the density of lead in g/cm^3

Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?

A car is moving on a circular road of radius r 150 m and its speed is increasing at a rate 8 m/s2. At someinstant its speed is 30 m/s, net acceleration of the car at this instant is(1) 8 m/s2(2) 6 m/s2(3) 10 m/s2(4) 14 m/s2

The least count of the ammeter shown below is :(1) 0.05 A(2) 0.5 A(3) 0.1 A(4) 1 A

Match the following derived quantities with their corresponding symbols of units.

The force required just to move a body up an inclined plane is double the force required just to prevent the body sliding down. If the coefficient of friction is 0.25, the angle of inclination of the plane is

Question 2A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is,(a) u2(b) u22g(c) u2g(d) u2g

A molecule of mass m of an ideal gas collides with the wall of the vessel with the velocity v and returns back with the same velocity. The change in the linear momentum of the molecule will be

What does the acronym SONAR stand for?