9478 + Interview Questions in Physics Page 40 InterviewSolution

1951.	What is the other name of the voice box which enables us to speak?
Answer» What is the other name of the voice box which enables us to speak?

Discussion

1952.	The value of critical angle for material of refractive index 2√33 is:
Answer» The value of critical angle for material of refractive index $\frac{2 \sqrt{3}}{3}$ is:

Discussion

1953.	The power consumed by the 4 V battery, in the given circuit shown below, is,
Answer» The power consumed by the $4 V$ battery, in the given circuit shown below, is,

Discussion

1954.	In the given diagram, PO is the incident ray, OQ is the reflected ray and ON is the normal to the reflecting surface. Find the angle x.
Answer» In the given diagram, PO is the incident ray, OQ is the reflected ray and ON is the normal to the reflecting surface. Find the angle x.

Discussion

1955.	Which of the following are transferred in a wave?
Answer» Which of the following are transferred in a wave?

Discussion

1956.	Static electricity is referred to that electricity :
Answer» Static electricity is referred to that electricity :

Discussion

1957.	Neha has to push a lighter iron box and Sohit has to push a heavier box of iron on the same floor. Who will have to apply a larger force?
Answer» Neha has to push a lighter iron box and Sohit has to push a heavier box of iron on the same floor. Who will have to apply a larger force?

Discussion

1958.	Question 5 (c)Uranus is the farthest planet in the solar system. (T/F)
Answer» Question 5 (c) Uranus is the farthest planet in the solar system. (T/F)

1958.

Question 5 (c)Uranus is the farthest planet in the solar system. (T/F)

Answer»

Question 5 (c)

Uranus is the farthest planet in the solar system. (T/F)

Discussion

1959.	Which lubricant is generally used by motorcycle mechanic to increase the efficiency of the vehicles?
Answer» Which lubricant is generally used by motorcycle mechanic to increase the efficiency of the vehicles?

Discussion

1960.	A smooth narrow tube in the form of an arc AB of a circle of centre O and radius r is fixed so that A is vertically above O and OB is horizontal. Particles P of mass m and Q of mass 2 m with a light inextensible string of length (πr/2) connecting them are placed inside the tube with P at A and Q at B and released from rest. Assuming the string remains taut during motion, find the speed of particles when P reaches B.
Answer» A smooth narrow tube in the form of an arc AB of a circle of centre O and radius r is fixed so that A is vertically above O and OB is horizontal. Particles P of mass m and Q of mass 2 m with a light inextensible string of length (πr/2) connecting them are placed inside the tube with P at A and Q at B and released from rest. Assuming the string remains taut during motion, find the speed of particles when P reaches B.

Discussion

1961.	Do you think all the stars in the sky move? Explain. Suppose a new planet is discovered between Uranus and Neptune. What will be its time period?
Answer» Do you think all the stars in the sky move? Explain. Suppose a new planet is discovered between Uranus and Neptune. What will be its time period?

Discussion

1962.	Simplifyand express the result in power notation with positive exponent.(i) (ii) (iii) (iv) (v)
Answer» Simplify and express the result in power notation with positive exponent. (i) (ii) (iii) (iv) (v)

1962.

Simplifyand express the result in power notation with positive exponent.(i) (ii) (iii) (iv) (v)

Answer»

Simplify
and express the result in power notation with positive exponent.

(i) (ii)

(iii) (iv)

(v)

Discussion

1963.	Please elaborate difference between refraction through prism and refraction through glass slab.
Answer» Please elaborate difference between refraction through prism and refraction through glass slab.

Discussion

1964.	Number of unit cells in 100g of fcc crystal with density 10g/cm^3 and cell edge as 200pm are how many
Answer» Number of unit cells in 100g of fcc crystal with density 10g/cm^3 and cell edge as 200pm are how many

Discussion

1965.	73.The dimentional formula of relative density is
Answer» 73.The dimentional formula of relative density is

Discussion

1966.	If direlectric cons†an t and voltage are given calculate tye capaci†an ce of the capacitor
Answer» If direlectric cons†an t and voltage are given calculate tye capaci†an ce of the capacitor

Discussion

1967.	22.The torque acting on the wheel about the centre is F1 is equal to 3N
Answer» 22.The torque acting on the wheel about the centre is F1 is equal to 3N

Discussion

1968.	Identify a noise polluter from the following -
Answer» Identify a noise polluter from the following -

Discussion

1969.	What will be the problem if 'large' concave mirror is used as dentist's mirror instead of 'small' concave mirror?
Answer» What will be the problem if 'large' concave mirror is used as dentist's mirror instead of 'small' concave mirror?

Discussion

1970.	Name three characteristics which are used to describe oscillations (or vibrations).
Answer» Name three characteristics which are used to describe oscillations (or vibrations).

Discussion

1971.	Statement 1: Moon is a natural satellite of earth. Statement 2: Man-made satellites launched from earth to orbit around it, are known as artificial satellites. But, moon is a naturally occuring celestial body, which revolves around the earth.
Answer» Statement 1: Moon is a natural satellite of earth. Statement 2: Man-made satellites launched from earth to orbit around it, are known as artificial satellites. But, moon is a naturally occuring celestial body, which revolves around the earth.

1971.

Statement 1: Moon is a natural satellite of earth. Statement 2: Man-made satellites launched from earth to orbit around it, are known as artificial satellites. But, moon is a naturally occuring celestial body, which revolves around the earth.

Answer»

Statement 1: Moon is a natural satellite of earth.

Statement 2: Man-made satellites launched from earth to orbit around it, are known as artificial satellites. But, moon is a naturally occuring celestial body, which revolves around the earth.

Discussion

1972.	44. 3 capillaries of lengthsL,L/2,L/3 are connected in series.their radii arer,r/2,r/3 respectively.if streamline flow is maintained and the pressure across the 1st capillary is p,then the a)pressure difference across ends od 2nd capillary is 8p b)pressure difference across 3rd capillary is 43p c)pressure difference across ends of 2nd capillary is 16p d)pressure difference across 3rd capillary is 56p
Answer» 44. 3 capillaries of lengthsL,L/2,L/3 are connected in series.their radii arer,r/2,r/3 respectively.if streamline flow is maintained and the pressure across the 1st capillary is p,then the a)pressure difference across ends od 2nd capillary is 8p b)pressure difference across 3rd capillary is 43p c)pressure difference across ends of 2nd capillary is 16p d)pressure difference across 3rd capillary is 56p

Discussion

1973.	Angle of incidence is equal to angle of reflection.
Answer» Angle of incidence is equal to angle of reflection.

Discussion

1974.	Label the parts of the ray diagram.
Answer» Label the parts of the ray diagram.

Discussion

1975.	Why is velocity of uniform circular motion along x axis negative?
Answer» Why is velocity of uniform circular motion along x axis negative?

Discussion

1976.	Explain why an iron needle sinks in water, but a ship made of iron floats on water.
Answer» Explain why an iron needle sinks in water, but a ship made of iron floats on water.

Discussion

1977.	The boiling point of water in Fahrenheit scale is:
Answer» The boiling point of water in Fahrenheit scale is:

Discussion

1978.	When will be the magnitudes of Displacement and distance are equal?
Answer» When will be the magnitudes of Displacement and distance are equal?

Discussion

1979.	What is the process through which energy is produced in the thermal power plants?
Answer» What is the process through which energy is produced in the thermal power plants?

Discussion

1980.	The weather becomes very cold after a hailstorm.
Answer» The weather becomes very cold after a hail storm.

Discussion

1981.	What are the disadvantages of using a Mercury Barometer how does an aneroid barometer takes care of this
Answer» What are the disadvantages of using a Mercury Barometer how does an aneroid barometer takes care of this

Discussion

1982.	Which among the following will have the highest increase in temperature for the same amount of heat?
Answer» Which among the following will have the highest increase in temperature for the same amount of heat?

Discussion

1983.	What are the uses of electromagnets?
Answer» What are the uses of electromagnets?

Discussion

1984.	Select the correct alternative: (a) The correct relation is (i) Density = Mass × Volume (ii) Mass = Density × Volume (iii) Volume =Denstity × Mass (iv) Density = Mass + Volume (b) The relative density of alcohol is 0.8. Its density is (i) 0.8 (ii) 800 kg m−3 (iii) 800 g cm−3 (iv) 0.8 kg m−3 (c) A block of wood of density of 0.8 g cm−3 has a volume of 60 cm3. The mass of the block is (i) 60.8 g (ii) 75 g (iii) 48 g (iv) 0.013 g (d) The density of aluminium is 2.7 g cm−3 and that of brass 8.4 g cm−3. The correct statement is : (i) Equal masses of aluminium and brass have equal volumes (ii) The mass of a certain volume of brass is more than the mass of equal volume of aluminium (iii) The volume of a certain mass of brass is more than the volume of equal mass of aluminium (iv) Equal volumes of aluminium and brass have equal masses. (e) A density bottle has a marking 25 mL on it. It means that : (i) the mass of density bottle is 25g (ii) the density bottle will store 25 mL of any liquid it (iii) the density bottle store 25 mL.of water, but more volume of liquid denser than water. (iv) the density bottle will store 25 mL of water but more volume of liquid lighter than water. (f) The correct statement is : (i) The buoyant force on a body is equal to the volume of the liquid displaced by it. (ii) The buoyant force on a body is equal to the volume of the body (iii) The buoyant force on a body is equal to the weight of the liquid displaced by it. (iv) The buoyant force on a body is always equal to the weight of the body. (g) A piece of wood floats on water. The buoyant force on wood will be : (i) zero (ii) more than the weight of the wood piece (iii) equal to the weight of the wood piece. (iv)less than the weight of the wood piece. (h) The weight of a body is more than the buoyant force experienced by it, due to a liquid. The body will : (i) sink (ii) float with its some part outside the liquid (iii) float just below the surface of liquid (iv) float with whole of its volume above the surface of liquid.
Answer» Select the correct alternative: (a) The correct relation is (i) Density = Mass $\times$ Volume (ii) Mass = Density $\times$ Volume (iii) Volume =Denstity $\times$ Mass (iv) Density = Mass + Volume (b) The relative density of alcohol is 0.8. Its density is (i) 0.8 (ii) 800 kg $m^{-} 3$ (iii) 800 g $c m - 3$ (iv) 0.8 kg $m^{-} 3$ (c) A block of wood of density of 0.8 g $c m^{-} 3$ has a volume of 60 $c m^{3}$ . The mass of the block is (i) 60.8 g (ii) 75 g (iii) 48 g (iv) 0.013 g (d) The density of aluminium is 2.7 g $c m^{-} 3$ and that of brass 8.4 g $c m^{-} 3$ . The correct statement is : (i) Equal masses of aluminium and brass have equal volumes (ii) The mass of a certain volume of brass is more than the mass of equal volume of aluminium (iii) The volume of a certain mass of brass is more than the volume of equal mass of aluminium (iv) Equal volumes of aluminium and brass have equal masses. (e) A density bottle has a marking 25 mL on it. It means that : (i) the mass of density bottle is 25g (ii) the density bottle will store 25 mL of any liquid it (iii) the density bottle store 25 mL.of water, but more volume of liquid denser than water. (iv) the density bottle will store 25 mL of water but more volume of liquid lighter than water. (f) The correct statement is : (i) The buoyant force on a body is equal to the volume of the liquid displaced by it. (ii) The buoyant force on a body is equal to the volume of the body (iii) The buoyant force on a body is equal to the weight of the liquid displaced by it. (iv) The buoyant force on a body is always equal to the weight of the body. (g) A piece of wood floats on water. The buoyant force on wood will be : (i) zero (ii) more than the weight of the wood piece (iii) equal to the weight of the wood piece. (iv)less than the weight of the wood piece. (h) The weight of a body is more than the buoyant force experienced by it, due to a liquid. The body will : (i) sink (ii) float with its some part outside the liquid (iii) float just below the surface of liquid (iv) float with whole of its volume above the surface of liquid.

1984.

Select the correct alternative: (a) The correct relation is (i) Density = Mass × Volume (ii) Mass = Density × Volume (iii) Volume =Denstity × Mass (iv) Density = Mass + Volume (b) The relative density of alcohol is 0.8. Its density is (i) 0.8 (ii) 800 kg m−3 (iii) 800 g cm−3 (iv) 0.8 kg m−3 (c) A block of wood of density of 0.8 g cm−3 has a volume of 60 cm3. The mass of the block is (i) 60.8 g (ii) 75 g (iii) 48 g (iv) 0.013 g (d) The density of aluminium is 2.7 g cm−3 and that of brass 8.4 g cm−3. The correct statement is : (i) Equal masses of aluminium and brass have equal volumes (ii) The mass of a certain volume of brass is more than the mass of equal volume of aluminium (iii) The volume of a certain mass of brass is more than the volume of equal mass of aluminium (iv) Equal volumes of aluminium and brass have equal masses. (e) A density bottle has a marking 25 mL on it. It means that : (i) the mass of density bottle is 25g (ii) the density bottle will store 25 mL of any liquid it (iii) the density bottle store 25 mL.of water, but more volume of liquid denser than water. (iv) the density bottle will store 25 mL of water but more volume of liquid lighter than water. (f) The correct statement is : (i) The buoyant force on a body is equal to the volume of the liquid displaced by it. (ii) The buoyant force on a body is equal to the volume of the body (iii) The buoyant force on a body is equal to the weight of the liquid displaced by it. (iv) The buoyant force on a body is always equal to the weight of the body. (g) A piece of wood floats on water. The buoyant force on wood will be : (i) zero (ii) more than the weight of the wood piece (iii) equal to the weight of the wood piece. (iv)less than the weight of the wood piece. (h) The weight of a body is more than the buoyant force experienced by it, due to a liquid. The body will : (i) sink (ii) float with its some part outside the liquid (iii) float just below the surface of liquid (iv) float with whole of its volume above the surface of liquid.

Answer»

Select the correct alternative:

(a) The correct relation is

(i) Density = Mass $\times$ Volume

(ii) Mass = Density $\times$ Volume

(iii) Volume =Denstity $\times$ Mass

(iv) Density = Mass + Volume

(b) The relative density of alcohol is 0.8. Its density is

(i) 0.8 (ii) 800 kg $m^{-} 3$

(iii) 800 g $c m - 3$ (iv) 0.8 kg $m^{-} 3$

(c) A block of wood of density of 0.8 g $c m^{-} 3$ has a volume of 60 $c m^{3}$ . The mass of the block is

(i) 60.8 g (ii) 75 g

(iii) 48 g (iv) 0.013 g

(d) The density of aluminium is 2.7 g $c m^{-} 3$ and that of brass 8.4 g $c m^{-} 3$ . The correct statement is :

(i) Equal masses of aluminium and brass have equal volumes

(ii) The mass of a certain volume of brass is more than the mass of equal volume of aluminium

(iii) The volume of a certain mass of brass is more than the volume of equal mass of aluminium

(iv) Equal volumes of aluminium and brass have equal masses.

(e) A density bottle has a marking 25 mL on it. It means that :

(i) the mass of density bottle is 25g

(ii) the density bottle will store 25 mL of any liquid it

(iii) the density bottle store 25 mL.of water, but more volume of liquid denser than water.

(iv) the density bottle will store 25 mL of water but more volume of liquid lighter than water.

(f) The correct statement is :

(i) The buoyant force on a body is equal to the volume of the liquid displaced by it.

(ii) The buoyant force on a body is equal to the volume of the body

(iii) The buoyant force on a body is equal to the weight of the liquid displaced by it.

(iv) The buoyant force on a body is always equal to the weight of the body.

(g) A piece of wood floats on water. The buoyant force on wood will be :

(i) zero

(ii) more than the weight of the wood piece

(iii) equal to the weight of the wood piece.

(iv)less than the weight of the wood piece.

(h) The weight of a body is more than the buoyant force experienced by it, due to a liquid. The body will :

(i) sink

(ii) float with its some part outside the liquid

(iii) float just below the surface of liquid

(iv) float with whole of its volume above the surface of liquid.

Discussion

1985.	What causes the moon to shine?
Answer» What causes the moon to shine?

Discussion

1986.	How is a spherical mirror used to diverge a beam of light from a point ? Name the type of mirror used.
Answer» How is a spherical mirror used to diverge a beam of light from a point ? Name the type of mirror used.

Discussion

1987.	What will be the molar heat capacity in a process if ratio of specific heat at constant pressure to constant volume is gamma of a gas and " Q " heat is supplied to it to do a work " nQ " ?
Answer» What will be the molar heat capacity in a process if ratio of specific heat at constant pressure to constant volume is gamma of a gas and " Q " heat is supplied to it to do a work " nQ " ?

Discussion

1988.	Two blocks of mass 5 kg and 10 kg are rest on a smooth horizontal table in contact with each other. A horizontal push of 10 N is first applied on a 5 kg block and then 10 kg block. Calculate the force between two blocks in each case.
Answer» Two blocks of mass 5 kg and 10 kg are rest on a smooth horizontal table in contact with each other. A horizontal push of 10 N is first applied on a 5 kg block and then 10 kg block. Calculate the force between two blocks in each case.

Discussion

1989.	What do you mean by this statement : The density of iron is 7.8gm cm-3
Answer» What do you mean by this statement : The density of iron is 7.8gm cm^-3

1989.

What do you mean by this statement : The density of iron is 7.8gm cm-3

Answer»

What do you mean by this statement :

The density of iron is 7.8gm cm^-3

Discussion

1990.	A wheel of moment of inertia 1 kg.m^2 is rotatimg at a speed of 30 rad/s. Due to friction on the axis it comes to rest in 10 minutes. Calculate the average torque of the friction. second average torque of the friction p
Answer» A wheel of moment of inertia 1 kg.m^2 is rotatimg at a speed of 30 rad/s. Due to friction on the axis it comes to rest in 10 minutes. Calculate the average torque of the friction. second average torque of the friction p

Discussion

1991.	How this is possible that algebric sum of voltage across each element of Series RLC A.C. circuit is greater then applied instantaneous voltage ??
Answer» How this is possible that algebric sum of voltage across each element of Series RLC A.C. circuit is greater then applied instantaneous voltage ??

Discussion

1992.	Which of the following is NOT used to reduce friction?
Answer» Which of the following is NOT used to reduce friction?

Discussion

1993.	What is the pressure experienced by a charged surface having surface charge density of 3×10−5 C/m2.
Answer» What is the pressure experienced by a charged surface having surface charge density of $3 \times 10^{- 5} {C/m}^{2}$ .

Discussion

1994.	The least count of a stop watch is 1/5s. The time of 20 oscillations of a pendulum is measured to be 25s. What is the maximum percentage error in this measurement?
Answer» The least count of a stop watch is 1/5s. The time of 20 oscillations of a pendulum is measured to be 25s. What is the maximum percentage error in this measurement?

Discussion

1995.	What is potential difference and conventional current?
Answer» What is potential difference and conventional current?

Discussion

1996.	Static friction is slightly smaller than rolling friction. State true or false.
Answer» Static friction is slightly smaller than rolling friction. State true or false.

Discussion

1997.	What will happen to the world if there is no friction?
Answer» What will happen to the world if there is no friction?

Discussion

1998.	Name the three types of musical instruments. How is sound produced in each type?
Answer» Name the three types of musical instruments. How is sound produced in each type?

Discussion

1999.	What is viscous drag force w.r.t millikan's oil drop experiment ?
Answer» What is viscous drag force w.r.t millikan's oil drop experiment ?

Discussion

2000.	ntTime period of a simple pendulum of length l is T1 and time period of a uniform rod of same length l is pivoted about one end and oscillating in a vertical plane is T2.Amplitude of oscillations in both cases is small.Then T1/T2 isn nta)1/sqrt3n ntb)1n ntc)sqrt4/sqrt3n ntd)sqrt3/sqrt2n
Answer» ntTime period of a simple pendulum of length l is T1 and time period of a uniform rod of same length l is pivoted about one end and oscillating in a vertical plane is T2.Amplitude of oscillations in both cases is small.Then T1/T2 isn nta)1/sqrt3n ntb)1n ntc)sqrt4/sqrt3n ntd)sqrt3/sqrt2n

Discussion

Explore topic-wise InterviewSolutions in .

What is the other name of the voice box which enables us to speak?

The value of critical angle for material of refractive index 2√33 is:

The power consumed by the 4 V battery, in the given circuit shown below, is,

In the given diagram, PO is the incident ray, OQ is the reflected ray and ON is the normal to the reflecting surface. Find the angle x.

Which of the following are transferred in a wave?

Static electricity is referred to that electricity :

Neha has to push a lighter iron box and Sohit has to push a heavier box of iron on the same floor. Who will have to apply a larger force?

Question 5 (c)Uranus is the farthest planet in the solar system. (T/F)

Which lubricant is generally used by motorcycle mechanic to increase the efficiency of the vehicles?

Do you think all the stars in the sky move? Explain. Suppose a new planet is discovered between Uranus and Neptune. What will be its time period?

Simplifyand express the result in power notation with positive exponent.(i) (ii) (iii) (iv) (v)

Please elaborate difference between refraction through prism and refraction through glass slab.

Number of unit cells in 100g of fcc crystal with density 10g/cm^3 and cell edge as 200pm are how many

73.The dimentional formula of relative density is

If direlectric cons†an t and voltage are given calculate tye capaci†an ce of the capacitor

22.The torque acting on the wheel about the centre is F1 is equal to 3N

Identify a noise polluter from the following -

What will be the problem if 'large' concave mirror is used as dentist's mirror instead of 'small' concave mirror?

Name three characteristics which are used to describe oscillations (or vibrations).

Statement 1: Moon is a natural satellite of earth. Statement 2: Man-made satellites launched from earth to orbit around it, are known as artificial satellites. But, moon is a naturally occuring celestial body, which revolves around the earth.

Angle of incidence is equal to angle of reflection.

Label the parts of the ray diagram.

Why is velocity of uniform circular motion along x axis negative?

Explain why an iron needle sinks in water, but a ship made of iron floats on water.

The boiling point of water in Fahrenheit scale is:

When will be the magnitudes of Displacement and distance are equal?

What is the process through which energy is produced in the thermal power plants?

The weather becomes very cold after a hailstorm.

What are the disadvantages of using a Mercury Barometer how does an aneroid barometer takes care of this

Which among the following will have the highest increase in temperature for the same amount of heat?

What are the uses of electromagnets?

What causes the moon to shine?

How is a spherical mirror used to diverge a beam of light from a point ? Name the type of mirror used.

What will be the molar heat capacity in a process if ratio of specific heat at constant pressure to constant volume is gamma of a gas and " Q " heat is supplied to it to do a work " nQ " ?

Two blocks of mass 5 kg and 10 kg are rest on a smooth horizontal table in contact with each other. A horizontal push of 10 N is first applied on a 5 kg block and then 10 kg block. Calculate the force between two blocks in each case.

What do you mean by this statement : The density of iron is 7.8gm cm-3

A wheel of moment of inertia 1 kg.m^2 is rotatimg at a speed of 30 rad/s. Due to friction on the axis it comes to rest in 10 minutes. Calculate the average torque of the friction. second average torque of the friction p

How this is possible that algebric sum of voltage across each element of Series RLC A.C. circuit is greater then applied instantaneous voltage ??

Which of the following is NOT used to reduce friction?

What is the pressure experienced by a charged surface having surface charge density of 3×10−5 C/m2.

The least count of a stop watch is 1/5s. The time of 20 oscillations of a pendulum is measured to be 25s. What is the maximum percentage error in this measurement?

What is potential difference and conventional current?

Static friction is slightly smaller than rolling friction. State true or false.

What will happen to the world if there is no friction?

Name the three types of musical instruments. How is sound produced in each type?

What is viscous drag force w.r.t millikan's oil drop experiment ?

ntTime period of a simple pendulum of length l is T1 and time period of a uniform rod of same length l is pivoted about one end and oscillating in a vertical plane is T2.Amplitude of oscillations in both cases is small.Then T1/T2 isn nta)1/sqrt3n ntb)1n ntc)sqrt4/sqrt3n ntd)sqrt3/sqrt2n