9478 + Interview Questions in Physics Page 82 InterviewSolution

4051.	Two identical parallel plate capacitors are connected in series and then joined with a battery of 100 V. A sheet of dielectric constant 4.0 is inserted between the plates of second capacitor. The potential difference across the capacitor will be
Answer» Two identical parallel plate capacitors are connected in series and then joined with a battery of 100 V. A sheet of dielectric constant 4.0 is inserted between the plates of second capacitor. The potential difference across the capacitor will be

Discussion

4052.	A lightning strike is so strong that it can destroy life and property. Select the safe measure(s) to be taken to protect life:
Answer» A lightning strike is so strong that it can destroy life and property. Select the safe measure(s) to be taken to protect life:

Discussion

4053.	In which of the following situations is frictional force acting?
Answer» In which of the following situations is frictional force acting?

Discussion

4054.	Which of the following actions on a ball results in a force acting on the ball?
Answer» Which of the following actions on a ball results in a force acting on the ball?

Discussion

4055.	Find the value of the angle of emergence from the prism. Refractive index of the glass is √3.
Answer» Find the value of the angle of emergence from the prism. Refractive index of the glass is $\sqrt{3}$ .

Discussion

4056.	(i) State reasons for the following statements:(a) Tap water conducts electricity, whereas distilled water does not.(b) During the summer season, a milkman usually adds a very small amount of baking soda to fresh milk.(c) For dilution of acid, acid is added into water and not water into acid.(d) Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does.(ii) How is Bleaching powder prepared? Give its important uses?
Answer» (i) State reasons for the following statements: (a) Tap water conducts electricity, whereas distilled water does not. (b) During the summer season, a milkman usually adds a very small amount of baking soda to fresh milk. (c) For dilution of acid, acid is added into water and not water into acid. (d) Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does. (ii) How is Bleaching powder prepared? Give its important uses?

4056.

(i) State reasons for the following statements:(a) Tap water conducts electricity, whereas distilled water does not.(b) During the summer season, a milkman usually adds a very small amount of baking soda to fresh milk.(c) For dilution of acid, acid is added into water and not water into acid.(d) Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does.(ii) How is Bleaching powder prepared? Give its important uses?

Answer»

(i) State reasons for the following statements:

(a) Tap water conducts electricity, whereas distilled water does not.

(b) During the summer season, a milkman usually adds a very small amount of baking soda to fresh milk.

(c) For dilution of acid, acid is added into water and not water into acid.

(d) Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does.

(ii) How is Bleaching powder prepared? Give its important uses?

Discussion

4057.	Sometimes, a crackling sound is heard while taking off sweater during winters. Explain.
Answer» Sometimes, a crackling sound is heard while taking off sweater during winters. Explain.

Discussion

4058.	The buzzing sound produced by bees or mosquitoes is due
Answer» The buzzing sound produced by bees or mosquitoes is due

4058.

The buzzing sound produced by bees or mosquitoes is due

Answer»

The buzzing sound produced by bees or mosquitoes is due

Discussion

4059.	A: Light from a distant quasar follows curved patharound a black hole.R An object curves the space around it due to itsmass.
Answer» A: Light from a distant quasar follows curved patharound a black hole.R An object curves the space around it due to itsmass.

Discussion

4060.	17. For the quadratic equation a * x ^ 2 + bx + c = 0, a, 1 and c are rational numbers and D = b ^ 2 - 4ac is a non-zero perfect square. The roots of the equation are
Answer» 17. For the quadratic equation a * x ^ 2 + bx + c = 0, a, 1 and c are rational numbers and D = b ^ 2 - 4ac is a non-zero perfect square. The roots of the equation are

Discussion

4061.	Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted to a charged balloon?
Answer» Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted to a charged balloon?

Discussion

4062.	Name any two effects of electric current.
Answer» Name any two effects of electric current.

Discussion

4063.	What is the effect on conductivity of decreased temperature
Answer» What is the effect on conductivity of decreased temperature

Discussion

4064.	A bus departs from the bus stand at 14:20 hours. It takes 6 hours and 23 minutes to reach the destination bus stand. What will be the time of arrival shown on a 12−hour clock?
Answer» A bus departs from the bus stand at $14 : 20$ hours. It takes $6$ hours and $23$ minutes to reach the destination bus stand. What will be the time of arrival shown on a $12 -$ hour clock?

Discussion

4065.	If length of the conductor of resistance 1 Ω is stretched to thrice of its initial length, then find the new resistance of the conductor.
Answer» If length of the conductor of resistance 1 Ω is stretched to thrice of its initial length, then find the new resistance of the conductor.

Discussion

4066.	A 20 N force is applied on an area of 2.5 m2. Compute the pressure in Pa.8
Answer» A $20 N$ force is applied on an area of $2.5 m^{2}$ . Compute the pressure in $Pa$ . 8

Discussion

4067.	Water from a pipe is coming at a rate of 100 litres per minute. If the radius of the pipe is 5 cm, the Reynolds number for the flow is of the order of (density of water =1000 kg/m3, coefficient of viscosity of water =1 mPa).
Answer» Water from a pipe is coming at a rate of $100 l i t r e s$ per minute. If the radius of the pipe is $5 c m$ , the Reynolds number for the flow is of the order of (density of water $= 1000 k g / m^{3}$ , coefficient of viscosity of water $= 1 m P a$ ).

Discussion

4068.	Which of the following is not a constellation?
Answer» Which of the following is not a constellation?

Discussion

4069.	How does the length of the air column contribute to the pitch being higher or lower?
Answer» How does the length of the air column contribute to the pitch being higher or lower?

Discussion

4070.	If a,b ,c are roots of the cubic equation x^3+3x^2-1=0 ,find a^2b+b^2c+c^2a
Answer» If a,b ,c are roots of the cubic equation x^3+3x^2-1=0 ,find a^2b+b^2c+c^2a

Discussion

4071.	13.Significance of electric field and Gauss theorm
Answer» 13.Significance of electric field and Gauss theorm

Discussion

4072.	When you press a rubber sucker on a smooth surface it sticks to the surface .Explain why this happens
Answer» When you press a rubber sucker on a smooth surface it sticks to the surface .Explain why this happens

Discussion

4073.	Two identical cubes A and B are placed in a tank containing a liquid as shown below. Choose the correct statement regarding pressures exerted on them.
Answer» Two identical cubes A and B are placed in a tank containing a liquid as shown below. Choose the correct statement regarding pressures exerted on them.

Discussion

4074.	The definition of "distance traveled by light through space in one year" best fits which science term?
Answer» The definition of "distance traveled by light through space in one year" best fits which science term?

Discussion

4075.	Identify a planet from the following clues.
Answer» Identify a planet from the following clues.

Discussion

4076.	Does pure water conduct electricity? If not, what can we do to make it conducting?
Answer» Does pure water conduct electricity? If not, what can we do to make it conducting?

Discussion

4077.	36. Initial velocity of a particle is u (at t = 0) and the acceleration f is given by a×t . Then select proper option. A. v=u + at²/2 B. v=u+ at C. v=u+ at²
Answer» 36. Initial velocity of a particle is u (at t = 0) and the acceleration f is given by a×t . Then select proper option. A. v=u + at²/2 B. v=u+ at C. v=u+ at²

Discussion

4078.	If the radius of curvature of a mirror is 20 cm, what is the focal length?
Answer» If the radius of curvature of a mirror is 20 cm, what is the focal length?

Discussion

4079.	A ball is rolled down on a surface made of glass and another surface made of soil. In which case will the ball move a longer distance?
Answer» A ball is rolled down on a surface made of glass and another surface made of soil. In which case will the ball move a longer distance?

Discussion

4080.	9. Hydrometallurgy is used for reduction of which of the following : (a) gold (b) copper Givr reason
Answer» 9. Hydrometallurgy is used for reduction of which of the following : (a) gold (b) copper Givr reason

Discussion

4081.	The shear modulus (G), modulus of elasticity (E) and the Poisson's ratio (v) of a material are related as,
Answer» The shear modulus $(G)$ , modulus of elasticity $(E)$ and the Poisson's ratio $(v)$ of a material are related as,

Discussion

4082.	The colour coding on a resistor from the left are blue, yellow, red and silver as shown in figure. The value of resistance is
Answer» The colour coding on a resistor from the left are blue, yellow, red and silver as shown in figure. The value of resistance is

Discussion

4083.	The equation of a stationary wave is y=2sin(50πt)cos(4πx/75) where y represent the displacement of a particle in cm at a distance x in cm from the origin at a time t. Then a node will occur from origin at a distance near Option 2.45 7.64.79.4
Answer» The equation of a stationary wave is y=2sin(50πt)cos(4πx/75) where y represent the displacement of a particle in cm at a distance x in cm from the origin at a time t. Then a node will occur from origin at a distance near Option 2.45 7.6 4.7 9.4

Discussion

4084.	Beam GHI is supported by three pontoons as shown in the figure below. The horizontal cross-sectional area of each pontoon is 8m2, the flexural rigidity of the beam is 10000kN−m2 and the unit weight of water is 10kN/m3.When the middle pontoon is brought back to its position as shwon in the figure above, the reaction at H will be
Answer» Beam GHI is supported by three pontoons as shown in the figure below. The horizontal cross-sectional area of each pontoon is $8 m^{2},$ the flexural rigidity of the beam is $10000 k N - m^{2}$ and the unit weight of water is $10 k N / m^{3} .$ When the middle pontoon is brought back to its position as shwon in the figure above, the reaction at H will be

Discussion

4085.	What will be the ratio of critical specific energy for two triangular channel having apex angle Θ1 and Θ2 respectively for a constant discharge ?
Answer» What will be the ratio of critical specific energy for two triangular channel having apex angle $Θ_{1}$ and $Θ_{2}$ respectively for a constant discharge ?

Discussion

4086.	A block of mass 10 kg is held against a vertical wall by applying a horizontal force of 50 N.The coefficient of friction is 0.2 between the block and the wall. What is the frictional force acting? (Take acceleration due to gravity, g=10 m/s2)
Answer» A block of mass $10 k g$ is held against a vertical wall by applying a horizontal force of $50 N$ .The coefficient of friction is 0.2 between the block and the wall. What is the frictional force acting? (Take acceleration due to gravity, $g = 10 m / s^{2}$ )

Discussion

4087.	Question 1Morning star is the name given to(a) pole star (b) planet Jupiter(c) star Sirius(d) planet Venus
Answer» Question 1 Morning star is the name given to (a) pole star (b) planet Jupiter (c) star Sirius (d) planet Venus

Discussion

4088.	What is isodiapher's?
Answer» What is isodiapher's?

Discussion

4089.	Why does Earth look blue-green when viewed from the space?
Answer» Why does Earth look blue-green when viewed from the space?

Discussion

4090.	38.Briefly describe the active mass and the partial pressure
Answer» 38.Briefly describe the active mass and the partial pressure

Discussion

4091.	Find the area between two concentric circles of radii 4 cm and 30 mm respectively.
Answer» Find the area between two concentric circles of radii $4 cm$ and $30 mm$ respectively.

Discussion

4092.	Four plastic bottles of different shapes and sizes are joined together as shown in the figure. Water is poured in the bottle kept at the rightmost end.Discuss whether the water level in the bottle in which water is poured will rise first or the water level in all the bottles will rise simultaneously.
Answer» Four plastic bottles of different shapes and sizes are joined together as shown in the figure. Water is poured in the bottle kept at the rightmost end. Discuss whether the water level in the bottle in which water is poured will rise first or the water level in all the bottles will rise simultaneously.

Discussion

4093.	Match the following : Column A Column B (a) kg m−3 (i) relative density (b) No unit (ii) sinks in alcohol (c) Relative density (iii) floats on water (d) Iron (iv) density (e) Wood (v) density bottle
Answer» Match the following : Column A Column B (a) kg $m^{-} 3$ (i) relative density (b) No unit (ii) sinks in alcohol (c) Relative density (iii) floats on water (d) Iron (iv) density (e) Wood (v) density bottle

4093.

Match the following : Column A Column B (a) kg m−3 (i) relative density (b) No unit (ii) sinks in alcohol (c) Relative density (iii) floats on water (d) Iron (iv) density (e) Wood (v) density bottle

Answer»

Match the following :

Column A Column B

(a) kg $m^{-} 3$ (i) relative density

(b) No unit (ii) sinks in alcohol

(c) Relative density (iii) floats on water

(d) Iron (iv) density

(e) Wood (v) density bottle

Discussion

4094.	Whether air bubble in water and soap bubble in water has same excess pressure??
Answer» Whether air bubble in water and soap bubble in water has same excess pressure??

Discussion

4095.	In order to get a diminished and virtual image, the object can be placed anywhere in front of a:
Answer» In order to get a diminished and virtual image, the object can be placed anywhere in front of a:

Discussion

4096.	Mark the correct alternative in the following question:For real numbers x and y, define xRy iff x-y+2 is an irrational number. Then the relation R is(a) reflexive (b) symmetric (c) transitive (d) none of these
Answer» Mark the correct alternative in the following question: For real numbers x and y, define xRy iff $x - y + \sqrt{2}$ is an irrational number. Then the relation R is (a) reflexive (b) symmetric (c) transitive (d) none of these

Discussion

4097.	Which of the following statement is true?
Answer» Which of the following statement is true?

Discussion

4098.	the dencity of water is gg/cm the numerical value of dencity in new unitkg/m3 os
Answer» the dencity of water is gg/cm the numerical value of dencity in new unitkg/m3 os

Discussion

4099.	A body sliding on a smooth inclined plane requires 4 second to reach the bottom starting from rest at the top .How much time does it take to cover one fourth dis†an ce starting from rest at the top
Answer» A body sliding on a smooth inclined plane requires 4 second to reach the bottom starting from rest at the top .How much time does it take to cover one fourth dis†an ce starting from rest at the top

Discussion

4100.	State the number of images of an object placed between two mirrors inclined at 75o to each other
Answer» State the number of images of an object placed between two mirrors inclined at 75^o to each other

Discussion

Explore topic-wise InterviewSolutions in .

Two identical parallel plate capacitors are connected in series and then joined with a battery of 100 V. A sheet of dielectric constant 4.0 is inserted between the plates of second capacitor. The potential difference across the capacitor will be

A lightning strike is so strong that it can destroy life and property. Select the safe measure(s) to be taken to protect life:

In which of the following situations is frictional force acting?

Which of the following actions on a ball results in a force acting on the ball?

Find the value of the angle of emergence from the prism. Refractive index of the glass is √3.

Sometimes, a crackling sound is heard while taking off sweater during winters. Explain.

The buzzing sound produced by bees or mosquitoes is due

A: Light from a distant quasar follows curved patharound a black hole.R An object curves the space around it due to itsmass.

17. For the quadratic equation a * x ^ 2 + bx + c = 0, a, 1 and c are rational numbers and D = b ^ 2 - 4ac is a non-zero perfect square. The roots of the equation are

Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted to a charged balloon?

Name any two effects of electric current.

What is the effect on conductivity of decreased temperature

A bus departs from the bus stand at 14:20 hours. It takes 6 hours and 23 minutes to reach the destination bus stand. What will be the time of arrival shown on a 12−hour clock?

If length of the conductor of resistance 1 Ω is stretched to thrice of its initial length, then find the new resistance of the conductor.

A 20 N force is applied on an area of 2.5 m2. Compute the pressure in Pa.8

Water from a pipe is coming at a rate of 100 litres per minute. If the radius of the pipe is 5 cm, the Reynolds number for the flow is of the order of (density of water =1000 kg/m3, coefficient of viscosity of water =1 mPa).

Which of the following is not a constellation?

How does the length of the air column contribute to the pitch being higher or lower?

If a,b ,c are roots of the cubic equation x^3+3x^2-1=0 ,find a^2b+b^2c+c^2a

13.Significance of electric field and Gauss theorm

When you press a rubber sucker on a smooth surface it sticks to the surface .Explain why this happens

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

The definition of "distance traveled by light through space in one year" best fits which science term?

Identify a planet from the following clues.

Does pure water conduct electricity? If not, what can we do to make it conducting?

36. Initial velocity of a particle is u (at t = 0) and the acceleration f is given by a×t . Then select proper option. A. v=u + at²/2 B. v=u+ at C. v=u+ at²

If the radius of curvature of a mirror is 20 cm, what is the focal length?

A ball is rolled down on a surface made of glass and another surface made of soil. In which case will the ball move a longer distance?

9. Hydrometallurgy is used for reduction of which of the following : (a) gold (b) copper Givr reason

The shear modulus (G), modulus of elasticity (E) and the Poisson's ratio (v) of a material are related as,

The colour coding on a resistor from the left are blue, yellow, red and silver as shown in figure. The value of resistance is

The equation of a stationary wave is y=2sin(50πt)cos(4πx/75) where y represent the displacement of a particle in cm at a distance x in cm from the origin at a time t. Then a node will occur from origin at a distance near Option 2.45 7.64.79.4

What will be the ratio of critical specific energy for two triangular channel having apex angle Θ1 and Θ2 respectively for a constant discharge ?

A block of mass 10 kg is held against a vertical wall by applying a horizontal force of 50 N.The coefficient of friction is 0.2 between the block and the wall. What is the frictional force acting? (Take acceleration due to gravity, g=10 m/s2)

Question 1Morning star is the name given to(a) pole star (b) planet Jupiter(c) star Sirius(d) planet Venus

What is isodiapher's?

Why does Earth look blue-green when viewed from the space?

38.Briefly describe the active mass and the partial pressure

Find the area between two concentric circles of radii 4 cm and 30 mm respectively.

Match the following : Column A Column B (a) kg m−3 (i) relative density (b) No unit (ii) sinks in alcohol (c) Relative density (iii) floats on water (d) Iron (iv) density (e) Wood (v) density bottle

Whether air bubble in water and soap bubble in water has same excess pressure??

In order to get a diminished and virtual image, the object can be placed anywhere in front of a:

Mark the correct alternative in the following question:For real numbers x and y, define xRy iff x-y+2 is an irrational number. Then the relation R is(a) reflexive (b) symmetric (c) transitive (d) none of these

Which of the following statement is true?

the dencity of water is gg/cm the numerical value of dencity in new unitkg/m3 os

A body sliding on a smooth inclined plane requires 4 second to reach the bottom starting from rest at the top .How much time does it take to cover one fourth dis†an ce starting from rest at the top

State the number of images of an object placed between two mirrors inclined at 75o to each other