9478 + Interview Questions in Physics Page 31 InterviewSolution

1501.	n identical cells of emf e and internal resistance r are connected in series to form a closed loop . it is found that by mistake m cells (2m
Answer» n identical cells of emf e and internal resistance r are connected in series to form a closed loop . it is found that by mistake m cells (2m

Discussion

1502.	If the aqueous solutions of the following salts AgNO3,FeCl3,HfCl4,ZnSO4 are electrolysed for 1 hour with 10 ampere current, which solution will deposit the maximum mass of the metal at cathode? The atomic weights are: Fe=56 u, Zn=65 u, Ag=108 u, Hf=178 u
Answer» If the aqueous solutions of the following salts $A g N O_{3}, F e C l_{3}, H f C l_{4}, Z n S O_{4}$ are electrolysed for 1 hour with $10$ ampere current, which solution will deposit the maximum mass of the metal at cathode? The atomic weights are: $F e = 56 u, Z n = 65 u, A g = 108 u, H f = 178 u$

Discussion

1503.	When someone opens a door(in a house), how does another door, that was left slightly opened,open suddenly?
Answer» When someone opens a door(in a house), how does another door, that was left slightly opened,open suddenly?

Discussion

1504.	Which of the following are non-contact forces?
Answer» Which of the following are non-contact forces?

Discussion

1505.	The below arrangement in its current state can attract iron filings if ___________ i) the switch is closed. ii) the terminals are reversed and the switch is closed.
Answer» The below arrangement in its current state can attract iron filings if ___________ i) the switch is closed. ii) the terminals are reversed and the switch is closed.

1505.

The below arrangement in its current state can attract iron filings if ___________ i) the switch is closed. ii) the terminals are reversed and the switch is closed.

Answer»

The below arrangement in its current state can attract iron filings if ___________

i) the switch is closed.

ii) the terminals are reversed and the switch is closed.

Discussion

1506.	A concave mirror:
Answer» A concave mirror:

Discussion

1507.	Which type of motion is associated with solids
Answer» Which type of motion is associated with solids

Discussion

1508.	The volume occupied by 1.8 g of water vapour at 374 °C and 1 bar pressure will be :-
Answer» The volume occupied by 1.8 g of water vapour at 374 °C and 1 bar pressure will be :-

Discussion

1509.	The bisector of an angle lies in its
Answer» The bisector of an angle lies in its

Discussion

1510.	What was the magnitude of Bhuj and Kashmir earthquakes on the Richter Scale?
Answer» What was the magnitude of Bhuj and Kashmir earthquakes on the Richter Scale?

Discussion

1511.	(WHY) there is gravity
Answer» (WHY) there is gravity

Discussion

1512.	why for sustained interference same polarization state light is required?
Answer» why for sustained interference same polarization state light is required?

Discussion

1513.	During boiling or vaporization, __
Answer» During boiling or vaporization, __

Discussion

1514.	________charge is acquired by a glass rod when it is rubbed with wool.
Answer» ________charge is acquired by a glass rod when it is rubbed with wool.

Discussion

1515.	What is the name of supersonic surface-to-air missile which was tested at Chandipur recently?
Answer» What is the name of supersonic surface-to-air missile which was tested at Chandipur recently?

Discussion

1516.	Among the three scubadivers, who would experience a higher liquid pressure than the others?
Answer» Among the three scubadivers, who would experience a higher liquid pressure than the others?

Discussion

1517.	The middle surface of a plane mirror is covered with a dark paper. How many images of yourself will you see in the mirror if earlier you could only see one image of yourself on that mirror?
Answer» The middle surface of a plane mirror is covered with a dark paper. How many images of yourself will you see in the mirror if earlier you could only see one image of yourself on that mirror?

1517.

The middle surface of a plane mirror is covered with a dark paper. How many images of yourself will you see in the mirror if earlier you could only see one image of yourself on that mirror?

Answer»

The middle surface of a plane mirror is covered with a dark paper. How many images of yourself will you see in the mirror if earlier you could only see one image of yourself on that mirror?

Discussion

1518.	A 156g block of dry ice (CO2) sublimed at 25°C &740 mm Hg. What volume does the gas occupy?
Answer» A 156g block of dry ice (CO2) sublimed at 25°C &740 mm Hg. What volume does the gas occupy?

Discussion

1519.	6. x=whole root m+n +whole root m-n divided by whole root m+n - whole root m-n where n is not equal to 0 then find the value of nx whole square -2mx+n
Answer» 6. x=whole root m+n +whole root m-n divided by whole root m+n - whole root m-n where n is not equal to 0 then find the value of nx whole square -2mx+n

Discussion

1520.	Question 5You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor? Why?
Answer» Question 5 You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor? Why?

Discussion

1521.	A closed organ pipe of radius r1 and an open organ pipe of radius r2 and having same length L resonate when excited with a given tuning fork. Closed organ pipe resonates in its fundamental mode whereas open organ pipe resonates in its first overtone, then(1) r2 – r1 = L (2) r2 – r1 = L/2(3) r2 – 2r1 = 2.5 L (4) 2r2 – 2r1 = 2.5 L
Answer» A closed organ pipe of radius r1 and an open organ pipe of radius r2 and having same length L resonate when excited with a given tuning fork. Closed organ pipe resonates in its fundamental mode whereas open organ pipe resonates in its first overtone, then (1) r2 – r1 = L (2) r2 – r1 = L/2 (3) r2 – 2r1 = 2.5 L (4) 2r2 – 2r1 = 2.5 L

Discussion

1522.	The volume of a cube of side length l is __.
Answer» The volume of a cube of side length $l$ is __.

Discussion

1523.	1 L of water is taken into a vessel and is heated to 80∘ C. The contents of the vessel are transferred into a thermos flask of 1 L capacity. It is observed that there is more water left in the vessel. Explain the reason for this.
Answer» $1 L$ of water is taken into a vessel and is heated to $80^{\circ} C$ . The contents of the vessel are transferred into a thermos flask of $1 L$ capacity. It is observed that there is more water left in the vessel. Explain the reason for this.

Discussion

1524.	M. Célérier est très mécontent de sa vie il va à l'astrologue qui fait des prédictions pour lui. Écrivez un dialogue (environ 40 mots).
Answer» M. Célérier est très mécontent de sa vie il va à l'astrologue qui fait des prédictions pour lui. Écrivez un dialogue (environ 40 mots).

Discussion

1525.	gravitational mass is proportional to gravitational (1)intensity (2)force (3)field (4)all of these
Answer» gravitational mass is proportional to gravitational (1)intensity (2)force (3)field (4)all of these

Discussion

1526.	The true value of a particular length is 4.283cm. The three instruments A,B and C used to measure this length give the readings 4.1cm, 4.24cm and 4.093cm. Arrange these readings in the increasing order of accuracy and precision. Which instrument is most reliable for measuring this length?
Answer» The true value of a particular length is 4.283cm. The three instruments A,B and C used to measure this length give the readings 4.1cm, 4.24cm and 4.093cm. Arrange these readings in the increasing order of accuracy and precision. Which instrument is most reliable for measuring this length?

Discussion

1527.	32.A swimmer is diving in a swimming pool vertically down with a velocity of 2 m per second . What will be the velocity as seen by a stationary fish at the bottom of the pool, right below the diver? Refractive index of water is 1.33
Answer» 32.A swimmer is diving in a swimming pool vertically down with a velocity of 2 m per second . What will be the velocity as seen by a stationary fish at the bottom of the pool, right below the diver? Refractive index of water is 1.33

Discussion

1528.	17.Find the minimum number of cells required to produce an electric current of 1.5 ampere through a resistance of 30 ohm given that EMF of a cell is 1.5 volts and internal resistance is 1 Ohm
Answer» 17.Find the minimum number of cells required to produce an electric current of 1.5 ampere through a resistance of 30 ohm given that EMF of a cell is 1.5 volts and internal resistance is 1 Ohm

Discussion

1529.	Question 18Two glass jars A and B are filled with carbon dioxide and oxygen gases, respectively. In each jar, a lighted candle is placed simultaneously. In which jar will the candle remain lighted for a longer time and why?
Answer» Question 18 Two glass jars A and B are filled with carbon dioxide and oxygen gases, respectively. In each jar, a lighted candle is placed simultaneously. In which jar will the candle remain lighted for a longer time and why?

Discussion

1530.	Why does water curve downward when placed in a glass tube Why do other liquids curve upward if placed in glass tube
Answer» Why does water curve downward when placed in a glass tube Why do other liquids curve upward if placed in glass tube

1530.

Why does water curve downward when placed in a glass tube Why do other liquids curve upward if placed in glass tube

Answer»

Why does water curve downward when placed in a glass tube

Why do other liquids curve upward if placed in glass tube

Discussion

1531.	Place a ringing bell in a closed jar and then remove air completely from the jar through vaccum pump. Can we hear the ringing sound. Give the reason.
Answer» Place a ringing bell in a closed jar and then remove air completely from the jar through vaccum pump. Can we hear the ringing sound. Give the reason.

Discussion

1532.	Density of ice is P and that of water is σ . What will be the decrease in volume when a mass M of ice melts
Answer» Density of ice is P and that of water is $σ$ . What will be the decrease in volume when a mass M of ice melts

Discussion

1533.	Does the moon spin faster than the earth
Answer» Does the moon spin faster than the earth

Discussion

1534.	81. A point luminous object(O) is at a distance h from front face of a glass slab of width d of refractive index(myu). On the back face of slab is a reflecting plane mirror. An observer sees the image of object in mirror. Distance of image from front face as seen by the observer will be
Answer» 81. A point luminous object(O) is at a distance h from front face of a glass slab of width d of refractive index(myu). On the back face of slab is a reflecting plane mirror. An observer sees the image of object in mirror. Distance of image from front face as seen by the observer will be

Discussion

1535.	Speed of sound wave is v. If a reflector moves towards a stationary source emitting waves of frequency f with speed u, the wavelength of reflected waves will be
Answer» Speed of sound wave is v. If a reflector moves towards a stationary source emitting waves of frequency f with speed u, the wavelength of reflected waves will be

Discussion

1536.	Which of the following forces is responsible for the raindrops falling downwards?
Answer» Which of the following forces is responsible for the raindrops falling downwards?

Discussion

1537.	why is friction necessary for rolling? and if necessary then why the wooden wheels are made frictionless?
Answer» why is friction necessary for rolling? and if necessary then why the wooden wheels are made frictionless?

Discussion

1538.	If two waves of same frequency and same amplitude resp.,superimposed produced a resul†an t disturbance of the same amplitude ,the waves differ in phase by
Answer» If two waves of same frequency and same amplitude resp.,superimposed produced a resul†an t disturbance of the same amplitude ,the waves differ in phase by

Discussion

1539.	A bird files due north at velocity 20 m/s for 15s it rests for 5s and then files due south at velocity 24 m/s for 10s. For the whole trip find the average speed and magnitude of average velocity.
Answer» A bird files due north at velocity 20 m/s for 15s it rests for 5s and then files due south at velocity 24 m/s for 10s. For the whole trip find the average speed and magnitude of average velocity.

Discussion

1540.	Why does a moving swing move faster when pushed by a person?
Answer» Why does a moving swing move faster when pushed by a person?

Discussion

1541.	Sketch electric lines of force due to (i) isolated positive change (ie q>0) and (ii) isolated negative change (ie q> a?
Answer» Sketch electric lines of force due to (i) isolated positive change (ie q>0) and (ii) isolated negative change (ie q<0)(b) Two point changes q and –q are placed at a distance 2a apart. Calculate the electric field at a point P situated at a distance r along the perpendicular bisector of the line joining the charges. What is the field when r >> a?

Discussion

1542.	"Charging by contact is not a reliable method because it often gives the charge opposite to that expected (in an electroscope)", how?
Answer» "Charging by contact is not a reliable method because it often gives the charge opposite to that expected (in an electroscope)", how?

Discussion

1543.	What causes lightning?
Answer» What causes lightning?

Discussion

1544.	A body needs a force F1 just to start motion on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is the static friction sliding friction and rolling friction ? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.
Answer» A body needs a force F₁ just to start motion on a surface, a force F₂ to continue its motion and a force F₃ to roll on the surface. What is the static friction sliding friction and rolling friction ? State whether F₂ is equal, less than or greater than (1) F₁ and (2) F₃.

1544.

A body needs a force F1 just to start motion on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is the static friction sliding friction and rolling friction ? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.

Answer»

A body needs a force F₁ just to start motion on a surface, a force F₂ to continue its motion and a force F₃ to roll on the surface. What is

the static friction

sliding friction and

rolling friction ? State whether F₂ is equal, less than or greater than (1) F₁ and (2) F₃.

Discussion

1545.	a thin rod ofmass mand length 2L is made to rotate about a normal axis through center of rod .if itd angular velacity changes from 0 to ω in time t the torque acti ng on it is ?
Answer» a thin rod ofmass mand length 2L is made to rotate about a normal axis through center of rod .if itd angular velacity changes from 0 to ω in time t the torque acti ng on it is ?

Discussion

1546.	How would you classify lemon juice - as good conductor or as a poor conductor of electricity ?
Answer» How would you classify lemon juice - as good conductor or as a poor conductor of electricity ?

Discussion

1547.	Explain why, we cannot see our surroundings clearly when we enter a darkened cinema hall from bright sunshine but our vision improves after some time.
Answer» Explain why, we cannot see our surroundings clearly when we enter a darkened cinema hall from bright sunshine but our vision improves after some time.

Discussion

1548.	79.Which of the following is a unit that of force and why? 1.Nm 2.mN 3.nm 4.Ns
Answer» 79.Which of the following is a unit that of force and why? 1.Nm 2.mN 3.nm 4.Ns

Discussion

1549.	Provided a racing car does not lose traction , the time taken by it to race from rest through a distance depends mainly on engines power P . drive the time t in terms of S and P , assuming that power is constant.
Answer» Provided a racing car does not lose traction , the time taken by it to race from rest through a distance depends mainly on engines power P . drive the time t in terms of S and P , assuming that power is constant.

Discussion

1550.	Is rate constant dependent or independent of the presence of the catalyst?
Answer» Is rate constant dependent or independent of the presence of the catalyst?

Discussion

Explore topic-wise InterviewSolutions in .

n identical cells of emf e and internal resistance r are connected in series to form a closed loop . it is found that by mistake m cells (2m

If the aqueous solutions of the following salts AgNO3,FeCl3,HfCl4,ZnSO4 are electrolysed for 1 hour with 10 ampere current, which solution will deposit the maximum mass of the metal at cathode? The atomic weights are: Fe=56 u, Zn=65 u, Ag=108 u, Hf=178 u

When someone opens a door(in a house), how does another door, that was left slightly opened,open suddenly?

Which of the following are non-contact forces?

The below arrangement in its current state can attract iron filings if ___________ i) the switch is closed. ii) the terminals are reversed and the switch is closed.

A concave mirror:

Which type of motion is associated with solids

The volume occupied by 1.8 g of water vapour at 374 °C and 1 bar pressure will be :-

The bisector of an angle lies in its

What was the magnitude of Bhuj and Kashmir earthquakes on the Richter Scale?

(WHY) there is gravity

why for sustained interference same polarization state light is required?

During boiling or vaporization, __

________charge is acquired by a glass rod when it is rubbed with wool.

What is the name of supersonic surface-to-air missile which was tested at Chandipur recently?

Among the three scubadivers, who would experience a higher liquid pressure than the others?

The middle surface of a plane mirror is covered with a dark paper. How many images of yourself will you see in the mirror if earlier you could only see one image of yourself on that mirror?

A 156g block of dry ice (CO2) sublimed at 25°C &740 mm Hg. What volume does the gas occupy?

6. x=whole root m+n +whole root m-n divided by whole root m+n - whole root m-n where n is not equal to 0 then find the value of nx whole square -2mx+n

Question 5You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor? Why?

The volume of a cube of side length l is __.

1 L of water is taken into a vessel and is heated to 80∘ C. The contents of the vessel are transferred into a thermos flask of 1 L capacity. It is observed that there is more water left in the vessel. Explain the reason for this.

M. Célérier est très mécontent de sa vie il va à l'astrologue qui fait des prédictions pour lui. Écrivez un dialogue (environ 40 mots).

gravitational mass is proportional to gravitational (1)intensity (2)force (3)field (4)all of these

The true value of a particular length is 4.283cm. The three instruments A,B and C used to measure this length give the readings 4.1cm, 4.24cm and 4.093cm. Arrange these readings in the increasing order of accuracy and precision. Which instrument is most reliable for measuring this length?

32.A swimmer is diving in a swimming pool vertically down with a velocity of 2 m per second . What will be the velocity as seen by a stationary fish at the bottom of the pool, right below the diver? Refractive index of water is 1.33

17.Find the minimum number of cells required to produce an electric current of 1.5 ampere through a resistance of 30 ohm given that EMF of a cell is 1.5 volts and internal resistance is 1 Ohm

Question 18Two glass jars A and B are filled with carbon dioxide and oxygen gases, respectively. In each jar, a lighted candle is placed simultaneously. In which jar will the candle remain lighted for a longer time and why?

Why does water curve downward when placed in a glass tube Why do other liquids curve upward if placed in glass tube

Place a ringing bell in a closed jar and then remove air completely from the jar through vaccum pump. Can we hear the ringing sound. Give the reason.

Density of ice is P and that of water is σ . What will be the decrease in volume when a mass M of ice melts

Does the moon spin faster than the earth

81. A point luminous object(O) is at a distance h from front face of a glass slab of width d of refractive index(myu). On the back face of slab is a reflecting plane mirror. An observer sees the image of object in mirror. Distance of image from front face as seen by the observer will be

Speed of sound wave is v. If a reflector moves towards a stationary source emitting waves of frequency f with speed u, the wavelength of reflected waves will be

Which of the following forces is responsible for the raindrops falling downwards?

why is friction necessary for rolling? and if necessary then why the wooden wheels are made frictionless?

If two waves of same frequency and same amplitude resp.,superimposed produced a resul†an t disturbance of the same amplitude ,the waves differ in phase by

A bird files due north at velocity 20 m/s for 15s it rests for 5s and then files due south at velocity 24 m/s for 10s. For the whole trip find the average speed and magnitude of average velocity.

A bird files due north at velocity 20 m/s for 15s it rests for 5s and then files due south at velocity 24 m/s for 10s. For the whole trip find the average speed and magnitude of average velocity.

Why does a moving swing move faster when pushed by a person?

Sketch electric lines of force due to (i) isolated positive change (ie q>0) and (ii) isolated negative change (ie q> a?

"Charging by contact is not a reliable method because it often gives the charge opposite to that expected (in an electroscope)", how?

What causes lightning?

A body needs a force F1 just to start motion on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is the static friction sliding friction and rolling friction ? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.

a thin rod ofmass mand length 2L is made to rotate about a normal axis through center of rod .if itd angular velacity changes from 0 to ω in time t the torque acti ng on it is ?

How would you classify lemon juice - as good conductor or as a poor conductor of electricity ?

Explain why, we cannot see our surroundings clearly when we enter a darkened cinema hall from bright sunshine but our vision improves after some time.

79.Which of the following is a unit that of force and why? 1.Nm 2.mN 3.nm 4.Ns

Provided a racing car does not lose traction , the time taken by it to race from rest through a distance depends mainly on engines power P . drive the time t in terms of S and P , assuming that power is constant.

Is rate constant dependent or independent of the presence of the catalyst?