6277 + Interview Questions in Physics Page 42 InterviewSolution

2051.	What will be the angle of reflection if a ray of light strikes the mirror normally?
Answer» What will be the angle of reflection if a ray of light strikes the mirror normally?

Discussion

2052.	what is focal length of a plane mirror.?
Answer» what is focal length of a plane mirror.?

Discussion

2053.	Two concentric coils of 20 turns each are situated in the same plane their radial are 0.2 m and 0.4 m and they carry 0.2 and 0.3 ampere current respectively in the same direction the magnetic field at the centre is
Answer» Two concentric coils of 20 turns each are situated in the same plane their radial are 0.2 m and 0.4 m and they carry 0.2 and 0.3 ampere current respectively in the same direction the magnetic field at the centre is

Discussion

2054.	14g of co at 27^° c is mixed with 16 g of o2 at 47^° c the temperature of mixture i
Answer» 14g of co at 27^° c is mixed with 16 g of o2 at 47^° c the temperature of mixture i

Discussion

2055.	It takes 20 min to melt 10 g of ice, when rays from the sun are focussed by a lens of diameter 5 cm on a block of ice. If the latent heat for ice is 80 cal/g, the heat received per unit area per unit time at the surface of earth (in cal cm–2min–1) is
Answer» It takes $20$ min to melt $10 g$ of ice, when rays from the sun are focussed by a lens of diameter $5 c m$ on a block of ice. If the latent heat for ice is $80 cal/g$ , the heat received per unit area per unit time at the surface of earth (in $c a l c m^{- 2} m i n^{- 1}$ ) is

Discussion

2056.	A plane mirror and an object approach each other with speeds of 5m/s and 10 m/s respectively. The speed of the image will be
Answer» A plane mirror and an object approach each other with speeds of 5m/s and 10 m/s respectively. The speed of the image will be

Discussion

2057.	A motion that repeats itself after equal intervals of time is known as __________.
Answer» A motion that repeats itself after equal intervals of time is known as __________.

Discussion

2058.	A solid cylinder is rolling without slipping on a plane having inclination thita and the coefficient of static friction is
Answer» A solid cylinder is rolling without slipping on a plane having inclination thita and the coefficient of static friction is

Discussion

2059.	The below graph represents the speed of an object moving with a constant speed of ________.
Answer» The below graph represents the speed of an object moving with a constant speed of ________.

Discussion

2060.	A tuning fork sends out so waves of wavelength 68.75 cm and 3 m in air and hydrogen respectively. If the velocity of sound in air is 330 m/s. Find the velocity of sound in hydrogen. Also, find the frequency of thetuning fork.
Answer» A tuning fork sends out so waves of wavelength 68.75 cm and 3 m in air and hydrogen respectively. If the velocity of sound in air is 330 m/s. Find the velocity of sound in hydrogen. Also, find the frequency of thetuning fork.

Discussion

2061.	Suppose you have three bodies A, B and C. When A and B are brought in contact, no heat flows between them. Now when B and C are brought in contact, heat flows from B to C until flow of heat stops. What will happen when A and C are brought in contact?
Answer» Suppose you have three bodies A, B and C. When A and B are brought in contact, no heat flows between them. Now when B and C are brought in contact, heat flows from B to C until flow of heat stops. What will happen when A and C are brought in contact?

Discussion

2062.	Which of the following has more inertia:(a) a rubber ball and a stone of the same size?
Answer» Which of the following has more inertia: (a) a rubber ball and a stone of the same size?

Discussion

2063.	Which of the following object is in motion with respect to you if you are sitting in a moving train?
Answer» Which of the following object is in motion with respect to you if you are sitting in a moving train?

Discussion

2064.	Two wires A and B are made of same material. The wire A has a length l and diameter r while the wire B has length 2l and diameter 2r. If the two wires are stretched by the same force, the elongation in A divided by elongation in B is
Answer» Two wires A and B are made of same material. The wire A has a length l and diameter r while the wire B has length 2l and diameter 2r. If the two wires are stretched by the same force, the elongation in A divided by elongation in B is

Discussion

2065.	Explain about conservation which is the fundamental property of charge
Answer» Explain about conservation which is the fundamental property of charge

Discussion

2066.	Which of the following option correctly defines wind?
Answer» Which of the following option correctly defines wind?

Discussion

2067.	A body weighs 2 kgf at equator. It's weight at the poles will be less than 2kgf or more
Answer» A body weighs 2 kgf at equator. It's weight at the poles will be less than 2kgf or more

Discussion

2068.	Given that sound travels in air at 340 ms−1, find the wavelength of the waves in air produced by the 20 kHz sound source.If the same source is put in a water tank, what would be the wavelength of the sound waves produced in water? Speed of sound in water = 1480 ms−1.
Answer» Given that sound travels in air at 340 ms $^{- 1}$ , find the wavelength of the waves in air produced by the 20 kHz sound source.If the same source is put in a water tank, what would be the wavelength of the sound waves produced in water? Speed of sound in water = 1480 ms $^{- 1}$ .

Discussion

2069.	A 12 cm wire is given the shape of a right angled triangle ABC having sides AB= 3cm, BC= 4cm, CA= 5cm . The resistance between two sides i.e. AB,BC,CA are measured by a multimeter . Calculate the ratio of the resistances.
Answer» A 12 cm wire is given the shape of a right angled triangle ABC having sides AB= 3cm, BC= 4cm, CA= 5cm . The resistance between two sides i.e. AB,BC,CA are measured by a multimeter . Calculate the ratio of the resistances.

Discussion

2070.	Three particles, each of mass m, are situated at the vertices of an equilateral triangle of side 'a'. The only forces acting on the particles are their mutual gravitational forces. It is intended that each particle moves along a circle while maintaining their original separation 'a'. Determine the initial velocity that should be given to each particle and the time period of the circular motion.
Answer» Three particles, each of mass m, are situated at the vertices of an equilateral triangle of side 'a'. The only forces acting on the particles are their mutual gravitational forces. It is intended that each particle moves along a circle while maintaining their original separation 'a'. Determine the initial velocity that should be given to each particle and the time period of the circular motion.

Discussion

2071.	In the figure shown below, a ray is incident on a plane mirror. Find the value of θ for which the ray retraces its path after the third reflection.
Answer» In the figure shown below, a ray is incident on a plane mirror. Find the value of $θ$ for which the ray retraces its path after the third reflection.

Discussion

2072.	The position vector of a particle is determined by the expression r=3tsquarei+4tsquarej+7k .The displacement traversed in first 10 second is : A. 100m B. 150m C. 300m D. 500m
Answer» The position vector of a particle is determined by the expression r=3tsquarei+4tsquarej+7k .The displacement traversed in first 10 second is : A. 100m B. 150m C. 300m D. 500m

Discussion

2073.	What do you mean by uniform and non-uniform motion? Give an example for each. [3 MARKS]
Answer» What do you mean by uniform and non-uniform motion? Give an example for each. [3 MARKS]

Discussion

2074.	20. What is doctor solution??and explain the Schrödinger wave equation??
Answer» 20. What is doctor solution??and explain the Schrödinger wave equation??

Discussion

2075.	You lift a heavy book from the floor of the room and keep it in the book shelf having a height 2 m. In this process you take 5 seconds. The work done by you will depend upon
Answer» You lift a heavy book from the floor of the room and keep it in the book shelf having a height 2 m. In this process you take 5 seconds. The work done by you will depend upon

2075.

You lift a heavy book from the floor of the room and keep it in the book shelf having a height 2 m. In this process you take 5 seconds. The work done by you will depend upon

Answer»

You lift a heavy book from the floor of the room and keep it in the book shelf having a height 2 m. In this process you take 5 seconds. The work done by you will depend upon

Discussion

2076.	The device which uses ultrasonic sound waves to measure the distance, direction, and speed of underwater objects is:
Answer» The device which uses ultrasonic sound waves to measure the distance, direction, and speed of underwater objects is:

Discussion

2077.	What is irregular or diffused reflection
Answer» What is irregular or diffused reflection

Discussion

2078.	Consider the following situation. Both A and B are at rest and the car is moving at 20 km/hr.The car appears to be in motion when seen by:
Answer» Consider the following situation. Both A and B are at rest and the car is moving at $20 k m / h r$ . The car appears to be in motion when seen by:

2078.

Consider the following situation. Both A and B are at rest and the car is moving at 20 km/hr.The car appears to be in motion when seen by:

Answer»

Consider the following situation. Both A and B are at rest and the car is moving at $20 k m / h r$ .

The car appears to be in motion when seen by:

Discussion

2079.	Question 5Suppose a new planet is discovered between Uranus and Neptune. Its time period would be(a) less than that of Neptune.(b) more than that of Neptune.(c) equal to that of Neptune or Uranus.(d) less than that of Uranus.
Answer» Question 5 Suppose a new planet is discovered between Uranus and Neptune. Its time period would be (a) less than that of Neptune. (b) more than that of Neptune. (c) equal to that of Neptune or Uranus. (d) less than that of Uranus.

Discussion

2080.	A boy whose eyes are 150 cm above the ground looks at his vertical mirror 200 cm away.The top and bottom of the mirror are 220 cm and 120 cm above the ground respectively.What length below his eyes can see himself in mirror
Answer» A boy whose eyes are 150 cm above the ground looks at his vertical mirror 200 cm away.The top and bottom of the mirror are 220 cm and 120 cm above the ground respectively.What length below his eyes can see himself in mirror

Discussion

2081.	Consider a U-tube, open at left end and closed at right end. If the pressure above the liquid in the right arm is P, find the value of P.Given: ρ2=2×13.6 g/cm3,ρ1=13.6 g/cm3, Atmospheric pressure Pa=76 cm of Hg.
Answer» Consider a U-tube, open at left end and closed at right end. If the pressure above the liquid in the right arm is $P$ , find the value of $P$ . Given: $ρ_{2} = 2 \times 13.6 {g/cm}^{3}, ρ_{1} = 13.6 {g/cm}^{3}$ , Atmospheric pressure $P_{a} = 76$ cm of $H g$ .

Discussion

2082.	A particle moves perpendicular towards a plane mirror with constant speed 4 cm/s. What is the speed of the image observed by an observer moving along the same direction with constant speed 2 cm/s if the mirror is moving in opposite direction with speed 10 cm/s ? 1 4cm/ 2 12cm/s 3 14cm/s 4 26cm/s Assume that all the speeds are with respect to ground frame.
Answer» A particle moves perpendicular towards a plane mirror with constant speed 4 cm/s. What is the speed of the image observed by an observer moving along the same direction with constant speed 2 cm/s if the mirror is moving in opposite direction with speed 10 cm/s ? 1 4cm/ 2 12cm/s 3 14cm/s 4 26cm/s Assume that all the speeds are with respect to ground frame.

Discussion

2083.	A charged particle of mass m= 2 kg and charge 1 μ C is thrown from a horizontal ground at an angle of 45^° with horizontal with a speed of 10m/s.In space a horizontal electric field E=2×10^7 N/C exists. Find the range of the projectil
Answer» A charged particle of mass m= 2 kg and charge 1 μ C is thrown from a horizontal ground at an angle of 45^° with horizontal with a speed of 10m/s.In space a horizontal electric field E=2×10^7 N/C exists. Find the range of the projectil

Discussion

2084.	if the mass of earth is very very large why its accelaration is very very smal
Answer» if the mass of earth is very very large why its accelaration is very very smal

Discussion

2085.	Two boys A and B are standing at two positions as shown in the diagram. Each step is 20 cm high and 20 cm wide. The mass of the ball is 300 grams, The potential energy is assumed to be zero at the ground. Consider g=10 m/s2 and assume that there is no loss of energy.What is the potential energy (in Joules) of the ball at the point of release?6.3
Answer» Two boys A and B are standing at two positions as shown in the diagram. Each step is 20 cm high and 20 cm wide. The mass of the ball is 300 grams, The potential energy is assumed to be zero at the ground. Consider $g = 10 m / s^{2}$ and assume that there is no loss of energy. What is the potential energy (in Joules) of the ball at the point of release? 6.3

Discussion

2086.	Question 2 Two clocks A and B are shown in the Figure. Clock A has an hour and a minute hand, whereas clock B has an hour hand, minute hand as well as a second hand. Which of the following statement is correct for these clocks? (a) Time interval of 30 seconds can be measured by clock A (b) Time interval of 30 seconds cannot be measured by clock B (c) Time interval of 5 minutes can be measured by both A and B (d) Time interval of 4 minutes 10 seconds can be measured by clock A
Answer» Question 2 Two clocks A and B are shown in the Figure. Clock A has an hour and a minute hand, whereas clock B has an hour hand, minute hand as well as a second hand. Which of the following statement is correct for these clocks? (a) Time interval of 30 seconds can be measured by clock A (b) Time interval of 30 seconds cannot be measured by clock B (c) Time interval of 5 minutes can be measured by both A and B (d) Time interval of 4 minutes 10 seconds can be measured by clock A

2086.

Question 2 Two clocks A and B are shown in the Figure. Clock A has an hour and a minute hand, whereas clock B has an hour hand, minute hand as well as a second hand. Which of the following statement is correct for these clocks? (a) Time interval of 30 seconds can be measured by clock A (b) Time interval of 30 seconds cannot be measured by clock B (c) Time interval of 5 minutes can be measured by both A and B (d) Time interval of 4 minutes 10 seconds can be measured by clock A

Answer»

Question 2

Two clocks A and B are shown in the Figure. Clock A has an hour and a minute hand, whereas clock B has an hour hand, minute hand as well as a second hand. Which of the following statement is correct for these clocks?

(a) Time interval of 30 seconds can be measured by clock A

(b) Time interval of 30 seconds cannot be measured by clock B

(c) Time interval of 5 minutes can be measured by both A and B

(d) Time interval of 4 minutes 10 seconds can be measured by clock A

Discussion

2087.	We know that If a ball of mass 1 kg is kept at a height 10 m possess potential energy mgh i.e. (1×10×10)=100 J. (Taking Earth surface as reference, where m = mass of object, g = acceleration due to gravity, h = height of object from earth surface.) what will be the kinetic energy of the ball falling freely from a height of 10 m when it reaches the ground? (take g = 10 m/s2 and neglect air drag)
Answer» We know that If a ball of mass 1 kg is kept at a height 10 m possess potential energy $m g h$ i.e. $(1 \times 10 \times 10) = 100$ J. (Taking Earth surface as reference, where $m$ = mass of object, $g$ = acceleration due to gravity, $h$ = height of object from earth surface.) what will be the kinetic energy of the ball falling freely from a height of 10 m when it reaches the ground? (take g = 10 $m / s^{2}$ and neglect air drag)

Discussion

2088.	Distinguish between the two methods of making artificial magnets
Answer» Distinguish between the two methods of making artificial magnets

Discussion

2089.	Let f(x)=2x=g(x)+h(x) where g(x) is an even function and h(x) is an odd function. If [.] represents the greatest integer function, then the value of [h(3)] is equal to
Answer» Let $f (x) = 2^{x} = g (x) + h (x)$ where $g (x)$ is an even function and $h (x)$ is an odd function. If $[.]$ represents the greatest integer function, then the value of $[h (3)]$ is equal to

Discussion

2090.	A bulb is kept burning just right above the following solids. Name the shape of the shadows obtained in each case. Attempt to give a rough sketch of the shadow.
Answer» A bulb is kept burning just right above the following solids. Name the shape of the shadows obtained in each case. Attempt to give a rough sketch of the shadow.

Discussion

2091.	Question 2Which of the following voices is likely to have the minimum frequency?(a) Baby girl(b) Baby boy(c) A man(d) A woman
Answer» Question 2 Which of the following voices is likely to have the minimum frequency? (a) Baby girl (b) Baby boy (c) A man (d) A woman

Discussion

2092.	Explain the difference:(a) Point sources and extended sources of light.(b) Umbra and penumbra.
Answer» Explain the difference: (a) Point sources and extended sources of light. (b) Umbra and penumbra.

Discussion

2093.	AN INFINTE LONG THREAD CARRIES A CHARGE UNIFORMLY SPREAD OVER ITS LENGTH . IT IS BENT IN THE FORM AS SHOWN. IF THE CHARGE PER UNIT LENGTH IS LAMBDA , THE ELECTRIC FIELD AT POINT O IS
Answer» AN INFINTE LONG THREAD CARRIES A CHARGE UNIFORMLY SPREAD OVER ITS LENGTH . IT IS BENT IN THE FORM AS SHOWN. IF THE CHARGE PER UNIT LENGTH IS LAMBDA , THE ELECTRIC FIELD AT POINT O IS

Discussion

2094.	Can speed time graph be used to calculate acceleration apart from velocity time graph?
Answer» Can speed time graph be used to calculate acceleration apart from velocity time graph?

Discussion

2095.	Identify any two types of motion happening in a car moving with a constant speed around a rectangular path.
Answer» Identify any two types of motion happening in a car moving with a constant speed around a rectangular path.

Discussion

2096.	What are the three effects of heat on an object?
Answer» What are the three effects of heat on an object?

Discussion

2097.	When seen from the ground, an apple falling from a tree is under______motion.
Answer» When seen from the ground, an apple falling from a tree is under______motion.

Discussion

2098.	Question 3An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be -(a) 100 W(b) 75 W(c) 50 W(d) 25 W
Answer» Question 3 An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be - (a) 100 W (b) 75 W (c) 50 W (d) 25 W

Discussion

2099.	A man start from point 'P' and goes 20 m due eastthen 5 m due North, then 35 m due west and finally25 m due South. His displacement from point 'P'
Answer» A man start from point 'P' and goes 20 m due east then 5 m due North, then 35 m due west and finally 25 m due South. His displacement from point 'P'

Discussion

2100.	Name the material of core of an electromagnet for temporary magnet permanent magnet.
Answer» Name the material of core of an electromagnet for temporary magnet permanent magnet.

2100.

Name the material of core of an electromagnet for temporary magnet permanent magnet.

Answer»

Name the material of core of an electromagnet for

temporary magnet

permanent magnet.

Discussion

Explore topic-wise InterviewSolutions in .

What will be the angle of reflection if a ray of light strikes the mirror normally?

what is focal length of a plane mirror.?

Two concentric coils of 20 turns each are situated in the same plane their radial are 0.2 m and 0.4 m and they carry 0.2 and 0.3 ampere current respectively in the same direction the magnetic field at the centre is

14g of co at 27^° c is mixed with 16 g of o2 at 47^° c the temperature of mixture i

It takes 20 min to melt 10 g of ice, when rays from the sun are focussed by a lens of diameter 5 cm on a block of ice. If the latent heat for ice is 80 cal/g, the heat received per unit area per unit time at the surface of earth (in cal cm–2min–1) is

A plane mirror and an object approach each other with speeds of 5m/s and 10 m/s respectively. The speed of the image will be

A motion that repeats itself after equal intervals of time is known as __________.

A solid cylinder is rolling without slipping on a plane having inclination thita and the coefficient of static friction is

The below graph represents the speed of an object moving with a constant speed of ________.

A tuning fork sends out so waves of wavelength 68.75 cm and 3 m in air and hydrogen respectively. If the velocity of sound in air is 330 m/s. Find the velocity of sound in hydrogen. Also, find the frequency of thetuning fork.

Suppose you have three bodies A, B and C. When A and B are brought in contact, no heat flows between them. Now when B and C are brought in contact, heat flows from B to C until flow of heat stops. What will happen when A and C are brought in contact?

Which of the following has more inertia:(a) a rubber ball and a stone of the same size?

Which of the following object is in motion with respect to you if you are sitting in a moving train?

Two wires A and B are made of same material. The wire A has a length l and diameter r while the wire B has length 2l and diameter 2r. If the two wires are stretched by the same force, the elongation in A divided by elongation in B is

Explain about conservation which is the fundamental property of charge

Which of the following option correctly defines wind?

A body weighs 2 kgf at equator. It's weight at the poles will be less than 2kgf or more

Given that sound travels in air at 340 ms−1, find the wavelength of the waves in air produced by the 20 kHz sound source.If the same source is put in a water tank, what would be the wavelength of the sound waves produced in water? Speed of sound in water = 1480 ms−1.

A 12 cm wire is given the shape of a right angled triangle ABC having sides AB= 3cm, BC= 4cm, CA= 5cm . The resistance between two sides i.e. AB,BC,CA are measured by a multimeter . Calculate the ratio of the resistances.

In the figure shown below, a ray is incident on a plane mirror. Find the value of θ for which the ray retraces its path after the third reflection.

The position vector of a particle is determined by the expression r=3tsquarei+4tsquarej+7k .The displacement traversed in first 10 second is : A. 100m B. 150m C. 300m D. 500m

What do you mean by uniform and non-uniform motion? Give an example for each. [3 MARKS]

20. What is doctor solution??and explain the Schrödinger wave equation??

You lift a heavy book from the floor of the room and keep it in the book shelf having a height 2 m. In this process you take 5 seconds. The work done by you will depend upon

The device which uses ultrasonic sound waves to measure the distance, direction, and speed of underwater objects is:

What is irregular or diffused reflection

Consider the following situation. Both A and B are at rest and the car is moving at 20 km/hr.The car appears to be in motion when seen by:

Question 5Suppose a new planet is discovered between Uranus and Neptune. Its time period would be(a) less than that of Neptune.(b) more than that of Neptune.(c) equal to that of Neptune or Uranus.(d) less than that of Uranus.

A boy whose eyes are 150 cm above the ground looks at his vertical mirror 200 cm away.The top and bottom of the mirror are 220 cm and 120 cm above the ground respectively.What length below his eyes can see himself in mirror

Consider a U-tube, open at left end and closed at right end. If the pressure above the liquid in the right arm is P, find the value of P.Given: ρ2=2×13.6 g/cm3,ρ1=13.6 g/cm3, Atmospheric pressure Pa=76 cm of Hg.

A charged particle of mass m= 2 kg and charge 1 μ C is thrown from a horizontal ground at an angle of 45^° with horizontal with a speed of 10m/s.In space a horizontal electric field E=2×10^7 N/C exists. Find the range of the projectil

if the mass of earth is very very large why its accelaration is very very smal

Distinguish between the two methods of making artificial magnets

Let f(x)=2x=g(x)+h(x) where g(x) is an even function and h(x) is an odd function. If [.] represents the greatest integer function, then the value of [h(3)] is equal to

A bulb is kept burning just right above the following solids. Name the shape of the shadows obtained in each case. Attempt to give a rough sketch of the shadow.

Question 2Which of the following voices is likely to have the minimum frequency?(a) Baby girl(b) Baby boy(c) A man(d) A woman

Explain the difference:(a) Point sources and extended sources of light.(b) Umbra and penumbra.

AN INFINTE LONG THREAD CARRIES A CHARGE UNIFORMLY SPREAD OVER ITS LENGTH . IT IS BENT IN THE FORM AS SHOWN. IF THE CHARGE PER UNIT LENGTH IS LAMBDA , THE ELECTRIC FIELD AT POINT O IS

Can speed time graph be used to calculate acceleration apart from velocity time graph?

Identify any two types of motion happening in a car moving with a constant speed around a rectangular path.

What are the three effects of heat on an object?

When seen from the ground, an apple falling from a tree is under______motion.

Question 3An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be -(a) 100 W(b) 75 W(c) 50 W(d) 25 W

A man start from point 'P' and goes 20 m due eastthen 5 m due North, then 35 m due west and finally25 m due South. His displacement from point 'P'

Name the material of core of an electromagnet for temporary magnet permanent magnet.