16569 + Interview Questions in Physics Page 3 InterviewSolution

101.	On which of the following factors does heat depend?
Answer» On which of the following factors does heat depend?

Discussion

102.	If ∑H and ∑V are the algebraic sums of the forces resolved horizontally and vertically respectively, and ∑M is the algebraic sum of the moments of forces about any point. For the equilibrium of the body acted upon ____________.
Answer» If $\sum H$ and $\sum V$ are the algebraic sums of the forces resolved horizontally and vertically respectively, and $\sum M$ is the algebraic sum of the moments of forces about any point. For the equilibrium of the body acted upon ____________.

Discussion

103.	In the common base mode of a transistor, the collector current is 5.488 mA for an emitter current of 5.60 mA. The value of the base current amplification factor (β) will be
Answer» In the common base mode of a transistor, the collector current is 5.488 mA for an emitter current of 5.60 mA. The value of the base current amplification factor $(β)$ will be

Discussion

104.	Question 6A copper wire has diameter 0.5 mm and resistivity of 1.6×10−8 Ω m. What will be the length of this wire to make its resistance 10 Ω ? How much does the resistance change if the diameter is doubled?
Answer» Question 6 A copper wire has diameter 0.5 mm and resistivity of $1.6 \times 10^{- 8} Ω m$ . What will be the length of this wire to make its resistance $10 Ω$ ? How much does the resistance change if the diameter is doubled?

Discussion

105.	Mass of a planet is twice that of the earth and its radius is four times of the earth .Find the value of' g 'on its surface .
Answer» Mass of a planet is twice that of the earth and its radius is four times of the earth .Find the value of' g 'on its surface .

Discussion

106.	two resistances r1 and r2 are connected turn by turn in series and parallel . plot the nature or v-i graph to represent the same
Answer» two resistances r1 and r2 are connected turn by turn in series and parallel . plot the nature or v-i graph to represent the same

Discussion

107.	The percentage error in the measurement of the voltage V is 3% and in the measurement of the current is 2%. The percentage error in the measurement of the resis†an ce is
Answer» The percentage error in the measurement of the voltage V is 3% and in the measurement of the current is 2%. The percentage error in the measurement of the resis†an ce is

Discussion

108.	A 50W,220V bulb is connected in series with a room heater across the mains .If the 50W bulb is replaced by 100W,220Vbulb,then heater output will be
Answer» A 50W,220V bulb is connected in series with a room heater across the mains .If the 50W bulb is replaced by 100W,220Vbulb,then heater output will be

Discussion

109.	Is delta r divided by delta t equal to v in uniform circular motion?? Explain how
Answer» Is delta r divided by delta t equal to v in uniform circular motion?? Explain how

Discussion

110.	A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf by applying an effort at a distance of 15 cm from the fulcrum. Find : (i) the mechanical advantage of the fire tongs , and (ii) the effort needed.
Answer» A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf by applying an effort at a distance of 15 cm from the fulcrum. Find : (i) the mechanical advantage of the fire tongs , and (ii) the effort needed.

Discussion

111.	Why rubber is an insulator
Answer» Why rubber is an insulator

Discussion

112.	At the magnetic poles of earth the compass needle will be 1.vertical 2.bent slightly 3.horizontal 4.inclined at 45 degree to horizontal
Answer» At the magnetic poles of earth the compass needle will be 1.vertical 2.bent slightly 3.horizontal 4.inclined at 45 degree to horizontal

Discussion

113.	which of thecfollowing functionnof time represents (a) SHM and (b) periodic but not simple harmonic Give the period for eachcase.(1) sinwt-cos wt)(2) sin^2 t explain with math
Answer» which of thecfollowing functionnof time represents (a) SHM and (b) periodic but not simple harmonic Give the period for eachcase.(1) sinwt-cos wt)(2) sin^2 t explain with math

Discussion

114.	A student used the set up given here to study the dependence of current (I) on the potential difference (V) across a resistor.He kept the contact C in four different positions marked as P, Q, R and S in the figure. On calculating the values of the ratio VI for his four readings, he would find that the value of this ratio :(1) for contact at point P is 14th of that for contact at point S.(2) for contact at point Q is 24th of that for contact at point S.(3) for contact at point R is 34th of that for contact at point S.(4) is the same for all the four readings
Answer» A student used the set up given here to study the dependence of current (I) on the potential difference (V) across a resistor. He kept the contact C in four different positions marked as P, Q, R and S in the figure. On calculating the values of the ratio $\frac{V}{I}$ for his four readings, he would find that the value of this ratio : (1) for contact at point P is $\frac{1}{4} th$ of that for contact at point S. (2) for contact at point Q is $\frac{2}{4} th$ of that for contact at point S. (3) for contact at point R is $\frac{3}{4} th$ of that for contact at point S. (4) is the same for all the four readings

Discussion

115.	Two friends start a race, and together they run for 50 m. Rohan turns right and runs 60 m while Rocky turns left and runs 40 m. Then Rohan turns left and runs 50 m while Rocky turns right and runs 50 m. How far are the two friends now from each other?
Answer» Two friends start a race, and together they run for $50 m$ . Rohan turns right and runs $60 m$ while Rocky turns left and runs $40 m$ . Then Rohan turns left and runs $50 m$ while Rocky turns right and runs $50 m$ . How far are the two friends now from each other?

Discussion

116.	Choose the correct word for the given images
Answer» Choose the correct word for the given images

Discussion

117.	What happens to the following light rays after reflection from a concave mirror?1. A ray of light passing through the C2. A ray of light passing throgh F3. A ray of light parallel to the principal axis.
Answer» What happens to the following light rays after reflection from a concave mirror? 1. A ray of light passing through the C 2. A ray of light passing throgh F 3. A ray of light parallel to the principal axis.

Discussion

118.	An object is placed at a distance of 30 cm from a convex mirror. A plane mirror is placed b/w them form in such a way that both mirror for the image at the same place . Calculate the focal length of the convex mirror. If the distance between two mirrors is 10 cm
Answer» An object is placed at a distance of 30 cm from a convex mirror. A plane mirror is placed b/w them form in such a way that both mirror for the image at the same place . Calculate the focal length of the convex mirror. If the distance between two mirrors is 10 cm

Discussion

119.	A block and tackle system of 5 pulleys is used to raise a load of 50 kgf steadily through a height of 20 m. Calculate the effort and MA
Answer» A block and tackle system of 5 pulleys is used to raise a load of 50 kgf steadily through a height of 20 m. Calculate the effort and MA

Discussion

120.	(a) What is meant by the 'series combination' and 'parallel combination' of resistors? Explain with diagrams.(b) What is the combined resistance of the three resistors of 5 Ω, 3 Ω and 2 Ω connected as shown in the figure?
Answer» (a) What is meant by the 'series combination' and 'parallel combination' of resistors? Explain with diagrams. (b) What is the combined resistance of the three resistors of 5 Ω, 3 Ω and 2 Ω connected as shown in the figure?

Discussion

121.	A charged particle of mass m and charge q is projected with a velocity uî in a region with non-uniform magnetic field B_{0 }x(-\overrightarrow{k } ). what is maximum x coordinate of partile
Answer» A charged particle of mass m and charge q is projected with a velocity uî in a region with non-uniform magnetic field B_{0 }x(-\overrightarrow{k } ). what is maximum x coordinate of partile

Discussion

122.	Why nichrome wire is used for making heatng coils in electrical heaters?
Answer» Why nichrome wire is used for making heatng coils in electrical heaters?

Discussion

123.	An object is placed at a certain distance from a convex lens of focal length 20 cm. Find the distance of the object if the image obtained is magnified 4 times.
Answer» An object is placed at a certain distance from a convex lens of focal length 20 cm. Find the distance of the object if the image obtained is magnified 4 times.

Discussion

124.	Two parallel rays of red and violet colours travelling through air, meet the air-glass boundary as shown in the given figure: The path of the 2 light rays inside the glass will be such that
Answer» Two parallel rays of red and violet colours travelling through air, meet the air-glass boundary as shown in the given figure: The path of the 2 light rays inside the glass will be such that

124.

Two parallel rays of red and violet colours travelling through air, meet the air-glass boundary as shown in the given figure: The path of the 2 light rays inside the glass will be such that

Answer»

Two parallel rays of red and violet colours travelling through air, meet the air-glass boundary as shown in the given figure:

The path of the 2 light rays inside the glass will be such that

Discussion

125.	A convex lens of diameter 8 cm is used to focus to parallel beam of light of wavelength 6200 ˙A. If the light be focused at a distance of 20 cm from the lens. What would be the radius of the central bright spot formed?
Answer» A convex lens of diameter $8 cm$ is used to focus to parallel beam of light of wavelength $6200 ˙ A$ . If the light be focused at a distance of $20 cm$ from the lens. What would be the radius of the central bright spot formed?

Discussion

126.	Draw a labelled diagram with the necessary switch, regulator, etc. to connect a bulb and a fan with the mains. In what arrangement are they connected to the mains : series or parallel?
Answer» Draw a labelled diagram with the necessary switch, regulator, etc. to connect a bulb and a fan with the mains. In what arrangement are they connected to the mains : series or parallel?

126.

Draw a labelled diagram with the necessary switch, regulator, etc. to connect a bulb and a fan with the mains. In what arrangement are they connected to the mains : series or parallel?

Answer»

Draw a labelled diagram with the necessary switch, regulator, etc. to connect a bulb and a fan with the mains. In what arrangement are they connected to the mains : series or parallel?

Discussion

127.	Find the work done to transfer 1019 electrons from point A to B which is maintained at a potential difference of 5 volts.
Answer» Find the work done to transfer $10^{19}$ electrons from point A to B which is maintained at a potential difference of 5 volts.

Discussion

128.	Why does a magnetic compass shows different deflection of its needle when put below and above the wire of a circuit????
Answer» Why does a magnetic compass shows different deflection of its needle when put below and above the wire of a circuit????

Discussion

129.	If an object of mass m moves in uniform circular motion, a force F acts on it, whose direction is always towards the centre of the circular path .if F depends on m speed v of the object and radius r of the circular path, find an expression for F
Answer» If an object of mass m moves in uniform circular motion, a force F acts on it, whose direction is always towards the centre of the circular path .if F depends on m speed v of the object and radius r of the circular path, find an expression for F

Discussion

130.	Question 2 The phenomenon of electromagnetic induction is (a) the process of charging a body. (b) the process of generating magnetic field due to a current passing through a coil. (c) producing induced current in a coil due to relative motion between a magnet and the coil. (d) the process of rotating a coil of an electric motor.
Answer» Question 2 The phenomenon of electromagnetic induction is (a) the process of charging a body. (b) the process of generating magnetic field due to a current passing through a coil. (c) producing induced current in a coil due to relative motion between a magnet and the coil. (d) the process of rotating a coil of an electric motor.

Discussion

131.	Sound travels faster in rarer medium but Why density of air decreases with increasing humidity or moisture and is said that density of humid air is 5\8 th times density of normal air? Should not density of air increase with more water vapour ?
Answer» Sound travels faster in rarer medium but Why density of air decreases with increasing humidity or moisture and is said that density of humid air is 5\8 th times density of normal air? Should not density of air increase with more water vapour ?

Discussion

132.	91.A convex glass lens (μ = 1.5) has a focal length of 8 cm when placed in air. What is the focal length of the lens when it is immersed in water (μ = 4/3)? 1) 32 cm 2) 6 cm 3) 16 cm 4) 30 cm
Answer» 91.A convex glass lens (μ = 1.5) has a focal length of 8 cm when placed in air. What is the focal length of the lens when it is immersed in water (μ = 4/3)? 1) 32 cm 2) 6 cm 3) 16 cm 4) 30 cm

Discussion

133.	What is household electrical supply?What does 50HZ specify ? (3 Marks)
Answer» What is household electrical supply?What does 50HZ specify ? (3 Marks)

Discussion

134.	Which of the following phenomenon enables us to drink a liquid through a straw?
Answer» Which of the following phenomenon enables us to drink a liquid through a straw?

Discussion

135.	47.When a point source of monochromatic light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and saturation current are 0.6 volt and 18 mA respectively. If the same source is placed 0.6 m away from photoelectric cell, then (1) Stopping potential will be 0.2 volt (2) Stopping potential will be 0.6 volt (3) The saturation current will be 6 mA (4) The saturation current will be 18 mA
Answer» 47.When a point source of monochromatic light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and saturation current are 0.6 volt and 18 mA respectively. If the same source is placed 0.6 m away from photoelectric cell, then (1) Stopping potential will be 0.2 volt (2) Stopping potential will be 0.6 volt (3) The saturation current will be 6 mA (4) The saturation current will be 18 mA

Discussion

136.	Name one medical technique which is based on magnetism produced in human body. For what purpose is this technique used?
Answer» Name one medical technique which is based on magnetism produced in human body. For what purpose is this technique used?

Discussion

137.	52.At what angle will a Ray of light incident on one face of an equilateral prism so that the emergent ray grazes the second surface of the prism(u=2) 1) 30 degree 2) 90 degree 3) 45 degree 4) 60 degree
Answer» 52.At what angle will a Ray of light incident on one face of an equilateral prism so that the emergent ray grazes the second surface of the prism(u=2) 1) 30 degree 2) 90 degree 3) 45 degree 4) 60 degree

Discussion

138.	What is mediated particles ?Meaning of- gravitational force are not affected by presence of other bodies and intervening medium.
Answer» What is mediated particles ? Meaning of- gravitational force are not affected by presence of other bodies and intervening medium.

Discussion

139.	What change do you expect in the characteristics of a musical sound if: i) its frequency is increased ii) its amplitude is increased
Answer» What change do you expect in the characteristics of a musical sound if: i) its frequency is increased ii) its amplitude is increased

139.

What change do you expect in the characteristics of a musical sound if: i) its frequency is increased ii) its amplitude is increased

Answer»

What change do you expect in the characteristics of a musical sound if:

i) its frequency is increased ii) its amplitude is increased

Discussion

140.	When resistors R1 and R2 are connected in series across a battery of potential difference V, the power dissipated by the resistors are P1 and P2 respectively. When they are connected in parallel across a battery of potential difference E, the power dissipated is P3 and P4 respectively. Which one of the following is true?
Answer» When resistors $R_{1} a n d R_{2}$ are connected in series across a battery of potential difference V, the power dissipated by the resistors are $P_{1} a n d P_{2}$ respectively. When they are connected in parallel across a battery of potential difference E, the power dissipated is $P_{3} a n d P_{4}$ respectively. Which one of the following is true?

Discussion

141.	Question 13The laws of reflection hold good for(a) plane mirror only(b) concave mirror only(c) convex mirror only(d) all mirrors irrespective of their shape
Answer» Question 13 The laws of reflection hold good for (a) plane mirror only (b) concave mirror only (c) convex mirror only (d) all mirrors irrespective of their shape

Discussion

142.	when a point source of monochromatic light is at a distanceof 0.2m from a photo electric cell,the cut-off voltage and the saturation current are 0.6 volt and 18mA respectively.If the same source is placed 0.6m away from the photoelectric cell then find the new stoping potential and saturation current .
Answer» when a point source of monochromatic light is at a distanceof 0.2m from a photo electric cell,the cut-off voltage and the saturation current are 0.6 volt and 18mA respectively.If the same source is placed 0.6m away from the photoelectric cell then find the new stoping potential and saturation current .

Discussion

143.	A thin prism of angle A=6∘ produces minimum deviation of δmin=3∘. Find the refractive index of the material of the prism.
Answer» A thin prism of angle $A = 6^{\circ}$ produces minimum deviation of $δ_{m i n} = 3^{\circ}$ . Find the refractive index of the material of the prism.

Discussion

144.	What is modulus
Answer» What is modulus

Discussion

145.	Number of electrons in a charge of 16 C will be
Answer» Number of electrons in a charge of $16 C$ will be

Discussion

146.	Why are metals good conductors of electricity? (please answer in points)
Answer» Why are metals good conductors of electricity? (please answer in points)

Discussion

147.	Out of rods and cones in the retina of your eye : (a) which detect colour ? (b) which work in dim light ?
Answer» Out of rods and cones in the retina of your eye : (a) which detect colour ? (b) which work in dim light ?

Discussion

148.	Two wires A and B of the same material, having radii in the ratio 1 : 2 and carry currents in the ratio 4 : 1. The ratio of drift speeds of electrons in A and B is:
Answer» Two wires A and B of the same material, having radii in the ratio 1 : 2 and carry currents in the ratio 4 : 1. The ratio of drift speeds of electrons in A and B is:

Discussion

149.	21. Why is the spectrum of white light ranging from red to violet is called a continuous spectrum?
Answer» 21. Why is the spectrum of white light ranging from red to violet is called a continuous spectrum?

Discussion

150.	A force of 72 dyne is inclined to the horizontal at angle of 60* find a in a mass of 9g which moves in the effect of this force in a horizontal direction
Answer» A force of 72 dyne is inclined to the horizontal at angle of 60* find a in a mass of 9g which moves in the effect of this force in a horizontal direction

Discussion

Explore topic-wise InterviewSolutions in .

On which of the following factors does heat depend?

If ∑H and ∑V are the algebraic sums of the forces resolved horizontally and vertically respectively, and ∑M is the algebraic sum of the moments of forces about any point. For the equilibrium of the body acted upon ____________.

In the common base mode of a transistor, the collector current is 5.488 mA for an emitter current of 5.60 mA. The value of the base current amplification factor (β) will be

Question 6A copper wire has diameter 0.5 mm and resistivity of 1.6×10−8 Ω m. What will be the length of this wire to make its resistance 10 Ω ? How much does the resistance change if the diameter is doubled?

Mass of a planet is twice that of the earth and its radius is four times of the earth .Find the value of' g 'on its surface .

two resistances r1 and r2 are connected turn by turn in series and parallel . plot the nature or v-i graph to represent the same

The percentage error in the measurement of the voltage V is 3% and in the measurement of the current is 2%. The percentage error in the measurement of the resis†an ce is

A 50W,220V bulb is connected in series with a room heater across the mains .If the 50W bulb is replaced by 100W,220Vbulb,then heater output will be

Is delta r divided by delta t equal to v in uniform circular motion?? Explain how

A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf by applying an effort at a distance of 15 cm from the fulcrum. Find : (i) the mechanical advantage of the fire tongs , and (ii) the effort needed.

Why rubber is an insulator

At the magnetic poles of earth the compass needle will be 1.vertical 2.bent slightly 3.horizontal 4.inclined at 45 degree to horizontal

which of thecfollowing functionnof time represents (a) SHM and (b) periodic but not simple harmonic Give the period for eachcase.(1) sinwt-cos wt)(2) sin^2 t explain with math

Two friends start a race, and together they run for 50 m. Rohan turns right and runs 60 m while Rocky turns left and runs 40 m. Then Rohan turns left and runs 50 m while Rocky turns right and runs 50 m. How far are the two friends now from each other?

Choose the correct word for the given images

What happens to the following light rays after reflection from a concave mirror?1. A ray of light passing through the C2. A ray of light passing throgh F3. A ray of light parallel to the principal axis.

An object is placed at a distance of 30 cm from a convex mirror. A plane mirror is placed b/w them form in such a way that both mirror for the image at the same place . Calculate the focal length of the convex mirror. If the distance between two mirrors is 10 cm

A block and tackle system of 5 pulleys is used to raise a load of 50 kgf steadily through a height of 20 m. Calculate the effort and MA

(a) What is meant by the 'series combination' and 'parallel combination' of resistors? Explain with diagrams.(b) What is the combined resistance of the three resistors of 5 Ω, 3 Ω and 2 Ω connected as shown in the figure?

A charged particle of mass m and charge q is projected with a velocity uî in a region with non-uniform magnetic field B_{0 }x(-\overrightarrow{k } ). what is maximum x coordinate of partile

Why nichrome wire is used for making heatng coils in electrical heaters?

An object is placed at a certain distance from a convex lens of focal length 20 cm. Find the distance of the object if the image obtained is magnified 4 times.

Two parallel rays of red and violet colours travelling through air, meet the air-glass boundary as shown in the given figure: The path of the 2 light rays inside the glass will be such that

A convex lens of diameter 8 cm is used to focus to parallel beam of light of wavelength 6200 ˙A. If the light be focused at a distance of 20 cm from the lens. What would be the radius of the central bright spot formed?

Draw a labelled diagram with the necessary switch, regulator, etc. to connect a bulb and a fan with the mains. In what arrangement are they connected to the mains : series or parallel?

Find the work done to transfer 1019 electrons from point A to B which is maintained at a potential difference of 5 volts.

Why does a magnetic compass shows different deflection of its needle when put below and above the wire of a circuit????

If an object of mass m moves in uniform circular motion, a force F acts on it, whose direction is always towards the centre of the circular path .if F depends on m speed v of the object and radius r of the circular path, find an expression for F

Sound travels faster in rarer medium but Why density of air decreases with increasing humidity or moisture and is said that density of humid air is 5\8 th times density of normal air? Should not density of air increase with more water vapour ?

91.A convex glass lens (μ = 1.5) has a focal length of 8 cm when placed in air. What is the focal length of the lens when it is immersed in water (μ = 4/3)? 1) 32 cm 2) 6 cm 3) 16 cm 4) 30 cm

What is household electrical supply?What does 50HZ specify ? (3 Marks)

Which of the following phenomenon enables us to drink a liquid through a straw?

Name one medical technique which is based on magnetism produced in human body. For what purpose is this technique used?

52.At what angle will a Ray of light incident on one face of an equilateral prism so that the emergent ray grazes the second surface of the prism(u=2) 1) 30 degree 2) 90 degree 3) 45 degree 4) 60 degree

What is mediated particles ?Meaning of- gravitational force are not affected by presence of other bodies and intervening medium.

What change do you expect in the characteristics of a musical sound if: i) its frequency is increased ii) its amplitude is increased

Question 13The laws of reflection hold good for(a) plane mirror only(b) concave mirror only(c) convex mirror only(d) all mirrors irrespective of their shape

A thin prism of angle A=6∘ produces minimum deviation of δmin=3∘. Find the refractive index of the material of the prism.

What is modulus

Number of electrons in a charge of 16 C will be

Why are metals good conductors of electricity? (please answer in points)

Out of rods and cones in the retina of your eye : (a) which detect colour ? (b) which work in dim light ?

Two wires A and B of the same material, having radii in the ratio 1 : 2 and carry currents in the ratio 4 : 1. The ratio of drift speeds of electrons in A and B is:

21. Why is the spectrum of white light ranging from red to violet is called a continuous spectrum?

A force of 72 dyne is inclined to the horizontal at angle of 60* find a in a mass of 9g which moves in the effect of this force in a horizontal direction