6277 + Interview Questions in Physics Page 75 InterviewSolution

3701.	A steel rod of length 6 m and diameter 20 mm is fixed between two rigid support. Determine the stress in the rod, when the temperature increases by 80 ∘C and the ends yield of 1 mm is allowed.Take Young's modulus, Y=2×106 N/cm2 and thermal coefficient of linear expansion, α=12×10−6/ ∘C.
Answer» A steel rod of length $6 m$ and diameter $20 mm$ is fixed between two rigid support. Determine the stress in the rod, when the temperature increases by $80^{\circ} C$ and the ends yield of $1 mm$ is allowed. Take Young's modulus, $Y = 2 \times 10^{6} {N/cm}^{2}$ and thermal coefficient of linear expansion, $α = 12 \times 10^{- 6} /^{\circ} C$ .

Discussion

3702.	One morning Ram and Rajat were talking to each other face to face at madiwala crossing signal. If Rajat's shadow was exactly to the left of Ram and in west direction, which direction was Ram facing?
Answer» One morning Ram and Rajat were talking to each other face to face at madiwala crossing signal. If Rajat's shadow was exactly to the left of Ram and in west direction, which direction was Ram facing?

Discussion

3703.	A box follows a path to reach from point A to B. The actual length of the path is 5 m in the direction of the force. If a force of 5 N acts on the box then what is the work done by the box?
Answer» A box follows a path to reach from point A to B. The actual length of the path is 5 m in the direction of the force. If a force of 5 N acts on the box then what is the work done by the box?

Discussion

3704.	Which of the following statements are correct? i. A particle is known to be at rest if it does not change its position with time. ii. In any journey, the numerical value of displacement ≤ distance iii. Distance covered by an object is the sum of speed of the object and the time taken to travel the distance.
Answer» Which of the following statements are correct? i. A particle is known to be at rest if it does not change its position with time. ii. In any journey, the numerical value of displacement $\leq$ distance iii. Distance covered by an object is the sum of speed of the object and the time taken to travel the distance.

Discussion

3705.	A solenoid 1.5m long and 4.0cm in diameter possesses 10turns/cm .A current of 5A is flowing through it .Then the magnetic induction inside is?
Answer» A solenoid 1.5m long and 4.0cm in diameter possesses 10turns/cm .A current of 5A is flowing through it .Then the magnetic induction inside is?

Discussion

3706.	Which of the following energy conversions take place in a torch?
Answer» Which of the following energy conversions take place in a torch?

Discussion

3707.	A lead shot of mass m is placed at the bottom of a vertical cardboard cylinder that is 1.5 m long and closed at both ends. The cylinder is suddenly inverted so that the shot falls by 1.5 m. If this process is repeated quickly 100 times, assuming no heat is dissipated or lost, the temperature of the shot will increase by(specific heat of lead=0.03 cal/g∘ C)
Answer» A lead shot of mass m is placed at the bottom of a vertical cardboard cylinder that is 1.5 m long and closed at both ends. The cylinder is suddenly inverted so that the shot falls by 1.5 m. If this process is repeated quickly 100 times, assuming no heat is dissipated or lost, the temperature of the shot will increase by(specific heat of lead=0.03 cal/ $g^{\circ}$ C)

Discussion

3708.	14.If the resistance of the upper half of rigid loop is twice of that of lower half the magnitude of magnetic induction is equal to
Answer» 14.If the resistance of the upper half of rigid loop is twice of that of lower half the magnitude of magnetic induction is equal to

Discussion

3709.	A train travels 40 km at a uniform speed of 30 kmph. Its average speed after travelling another 40 km is 45 kmph for the whole journey. Its speed in the second half of the journey is
Answer» A train travels 40 km at a uniform speed of 30 kmph. Its average speed after travelling another 40 km is 45 kmph for the whole journey. Its speed in the second half of the journey is

Discussion

3710.	Question 4 When a switch is in OFF position, (i) circuit starting from the positive terminal of the cell stops at the switch (ii) circuit is open (iii) no current flows through it. (iv) current flows after some time Choose the combination of correct answer from the following.
Answer» Question 4 When a switch is in OFF position, (i) circuit starting from the positive terminal of the cell stops at the switch (ii) circuit is open (iii) no current flows through it. (iv) current flows after some time Choose the combination of correct answer from the following.

3710.

Question 4 When a switch is in OFF position, (i) circuit starting from the positive terminal of the cell stops at the switch (ii) circuit is open (iii) no current flows through it. (iv) current flows after some time Choose the combination of correct answer from the following.

Answer»

Question 4

When a switch is in OFF position,
(i) circuit starting from the positive terminal of the cell stops at the switch
(ii) circuit is open
(iii) no current flows through it.
(iv) current flows after some time
Choose the combination of correct answer from the following.

Discussion

3711.	Which of the following phenomenon occurs during daytime?
Answer» Which of the following phenomenon occurs during daytime?

Discussion

3712.	When an iron piece of irregular shape is immersed in a container containing water of 12 ml, the water rises to 30 ml. The volume of the iron is _____.
Answer» When an iron piece of irregular shape is immersed in a container containing water of $12 m l$ , the water rises to $30 m l$ . The volume of the iron is _____.

Discussion

3713.	an object moving on a rec†an gular track of dimension 6m \ast8m travels each meter in 1 seconds what will be its dis†an ce travelled and displacement in 42 secon
Answer» an object moving on a rec†an gular track of dimension 6m \ast8m travels each meter in 1 seconds what will be its dis†an ce travelled and displacement in 42 secon

Discussion

3714.	Which propert of the magnet can help us prove that earth acts like a huge magnet ?
Answer» Which propert of the magnet can help us prove that earth acts like a huge magnet ?

Discussion

3715.	21. The equilibrium constant KP is 4 for the reaction H2(g)+CO2(g)\updownarrow H2O+CO. at 1660^° C. Initially 0.8 mole of H2 and CO2 are both injected into 5 litre flask. What is the equilibrium concentration of CO2??
Answer» 21. The equilibrium constant KP is 4 for the reaction H2(g)+CO2(g)\updownarrow H2O+CO. at 1660^° C. Initially 0.8 mole of H2 and CO2 are both injected into 5 litre flask. What is the equilibrium concentration of CO2??

Discussion

3716.	83.why electric current creates a magnet field ? and why magnet attract materials?
Answer» 83.why electric current creates a magnet field ? and why magnet attract materials?

Discussion

3717.	PROVE THAT If an object moves towards or away from aplane mirror at a speed v the image will approach at same speed v.and also relative velocity ofimage with respect to object is 2v.
Answer» PROVE THAT If an object moves towards or away from aplane mirror at a speed v the image will approach at same speed v.and also relative velocity ofimage with respect to object is 2v.

Discussion

3718.	67.Two closed organ pipes 100 cm and 101 cm long gives 16 beats in 20s when each pipe is sounded in its fundamental mode . calaculate velocity of sound ? A)303m/s B)332m/s C)323.2m/s D)300m/s
Answer» 67.Two closed organ pipes 100 cm and 101 cm long gives 16 beats in 20s when each pipe is sounded in its fundamental mode . calaculate velocity of sound ? A)303m/s B)332m/s C)323.2m/s D)300m/s

Discussion

3719.

Explain the phenomenon of land breeze and sea breeze with diagrams.

Answer»

Explain the phenomenon of land breeze and sea breeze with diagrams.

Discussion

3720.	A coil of wire wound around a soft iron bar is called an electromagnet. When does an electromagnet act like a magnet?
Answer» A coil of wire wound around a soft iron bar is called an electromagnet. When does an electromagnet act like a magnet?

Discussion

3721.	how a glass rod experiences positive charge by rubbing it with silk cloth and ebonite rod having negative charge by rubbing it with fur
Answer» how a glass rod experiences positive charge by rubbing it with silk cloth and ebonite rod having negative charge by rubbing it with fur

Discussion

3722.	111.Ques-Assertion reason based A: A system displaying a hysteresis loop such as a ferromagnet is a device for storing memory. R: Magnetisation of a ferromagnet is not a single valued function of the magnetising field rather it depends both on the field and also on history of magnetisation.
Answer» 111.Ques-Assertion reason based A: A system displaying a hysteresis loop such as a ferromagnet is a device for storing memory. R: Magnetisation of a ferromagnet is not a single valued function of the magnetising field rather it depends both on the field and also on history of magnetisation.

Discussion

3723.	How do you know when the needle is pointing north?
Answer» How do you know when the needle is pointing north?

Discussion

3724.	Which of the following is/are true with respect to electromagnets?
Answer» Which of the following is/are true with respect to electromagnets?

Discussion

3725.	99.3The resistance of a wire is 'R' ohm is melted and stretched 'n' times its original length, its new resistance will be ?
Answer» 99.3The resistance of a wire is 'R' ohm is melted and stretched 'n' times its original length, its new resistance will be ?

Discussion

3726.	77.An athlete completes one round of a circular track of diameter 200m in 40sec. What will be the covered and the displacement at the end of 2min.20sec.??
Answer» 77.An athlete completes one round of a circular track of diameter 200m in 40sec. What will be the covered and the displacement at the end of 2min.20sec.??

Discussion

3727.	100. What is the work done by the field in rotating� a dipole?
Answer» 100. What is the work done by the field in rotating� a dipole?

Discussion

3728.	what is the sure check of charge acquired on a body?
Answer» what is the sure check of charge acquired on a body?

Discussion

3729.	Question 15Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?
Answer» Question 15 Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?

3729.

Question 15Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?

Answer»

Question 15

Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?

Discussion

3730.	Why do we see lightning first and then after a moment we hear the thunder?
Answer» Why do we see lightning first and then after a moment we hear the thunder?

3730.

Why do we see lightning first and then after a moment we hear the thunder?

Answer»

Why do we see lightning first and then after a moment we hear the thunder?

Discussion

3731.	Why air bubble inside the water behaves like a diverging lens
Answer» Why air bubble inside the water behaves like a diverging lens

Discussion

3732.	Question 22 How is sound produced and how is it transmitted and heard by us?
Answer» Question 22 How is sound produced and how is it transmitted and heard by us?

Discussion

3733.	A simple circuit consists of___.
Answer» A simple circuit consists of___.

Discussion

3734.	Question 2Why is the weight of an object on the moon 16th its weight on the earth?
Answer» Question 2 Why is the weight of an object on the moon $\frac{1}{6} t h$ its weight on the earth?

Discussion

3735.	In the given figure if the mirror is rotated by an angle θ in the clockwise direction. Then the angle of incidence becomes equal to:
Answer» In the given figure if the mirror is rotated by an angle $θ$ in the clockwise direction. Then the angle of incidence becomes equal to:

3735.

In the given figure if the mirror is rotated by an angle θ in the clockwise direction. Then the angle of incidence becomes equal to:

Answer»

In the given figure if the mirror is rotated by an angle $θ$ in the clockwise direction. Then the angle of incidence becomes equal to:

Discussion

3736.	In a given U− shaped tube, open at the left end as that of the right end is closed, if the pressure above the liquid in the right arm is P, find the value of P. Given d1=2×13.6 g/cm3 and d2=13.6 g/ cm3.[Atmospheric pressure Pa=76 cm of Hg]
Answer» In a given $U -$ shaped tube, open at the left end as that of the right end is closed, if the pressure above the liquid in the right arm is $P$ , find the value of $P$ . Given $d_{1} = 2 \times 13.6 {g/cm}^{3}$ and $d_{2} = 13.6 {g/ cm}^{3} .$ [Atmospheric pressure $P_{a} = 76 cm$ of $Hg$ ]

Discussion

3737.	An ___ is a material which does not allow electricity to pass through.
Answer» An ___ is a material which does not allow electricity to pass through.

Discussion

3738.	What is the special feature of taps at railway stations?
Answer» What is the special feature of taps at railway stations?

Discussion

3739.	Two sealed containers 'A' and 'B' are taken to outer space where there is neither gravity nor atmosphere. Container 'A' is filled with water and container 'B' is filled with air. Choose the correct observation(s)?
Answer» Two sealed containers 'A' and 'B' are taken to outer space where there is neither gravity nor atmosphere. Container 'A' is filled with water and container 'B' is filled with air. Choose the correct observation(s)?

Discussion

3740.	The temperature at which the rms velocity of SO2(g) is same as that of O2(g) at 320 K, is Options:a- 320^° C b- 640^° C c- 320k d-640 K
Answer» The temperature at which the rms velocity of SO2(g) is same as that of O2(g) at 320 K, is Options:a- 320^° C b- 640^° C c- 320k d-640 K

Discussion

3741.	What is the difference between simple ratio and whole ratio?
Answer» What is the difference between simple ratio and whole ratio?

Discussion

3742.	15. Times , Mirror and Sun are three newspapers. 1] All readers of the Times read Sun. 2] Every person either reads the Sun or does not read the Mirror. 3] 11 people read the Sun but does not read the Mirror. 4] 8people read either the Times or the Mirror but not both. 5]10 people read the Sun and either read the Mirror or do not read the Times. 6] 14 people either read the Sun and not the Mirror or read both the Sun and Times. 7] 9 people neither reads the Times nor the Mirror. 1] Number of people who read only Sun? 2] Number of people who read Times and Mirror both ? 3] Number of people who do not read any of the newspaper?
Answer» 15. Times , Mirror and Sun are three newspapers. 1] All readers of the Times read Sun. 2] Every person either reads the Sun or does not read the Mirror. 3] 11 people read the Sun but does not read the Mirror. 4] 8people read either the Times or the Mirror but not both. 5]10 people read the Sun and either read the Mirror or do not read the Times. 6] 14 people either read the Sun and not the Mirror or read both the Sun and Times. 7] 9 people neither reads the Times nor the Mirror. 1] Number of people who read only Sun? 2] Number of people who read Times and Mirror both ? 3] Number of people who do not read any of the newspaper?

Discussion

3743.	Define thermometers. What are the 2 types of thermometers? State the difference between the two.
Answer» Define thermometers. What are the 2 types of thermometers? State the difference between the two.

Discussion

3744.	if a particle is moving with cons†an t speed of 20m/s. What is the magnitude of average accelaration.
Answer» if a particle is moving with cons†an t speed of 20m/s. What is the magnitude of average accelaration.

Discussion

3745.	Air contains nearly 20% oxygen by volume.The volume of air needed for completecombustion of 100 ml. of acetylene will be
Answer» Air contains nearly 20% oxygen by volume.The volume of air needed for completecombustion of 100 ml. of acetylene will be

Discussion

3746.	Give reasons (a) Even when the water at the surface of a lake is frozen, aquatic animals continue to live below the ice. (b) It is easier to swim in sea water. (c) Water is said to be a universal solvent. (d) Water is an ideal medium for chemical reactions.
Answer» Give reasons (a) Even when the water at the surface of a lake is frozen, aquatic animals continue to live below the ice. (b) It is easier to swim in sea water. (c) Water is said to be a universal solvent. (d) Water is an ideal medium for chemical reactions.

3746.

Give reasons (a) Even when the water at the surface of a lake is frozen, aquatic animals continue to live below the ice. (b) It is easier to swim in sea water. (c) Water is said to be a universal solvent. (d) Water is an ideal medium for chemical reactions.

Answer»

Give reasons

(a) Even when the water at the surface of a lake is frozen, aquatic animals continue to live below the ice.

(b) It is easier to swim in sea water.

(c) Water is said to be a universal solvent.

(d) Water is an ideal medium for chemical reactions.

Discussion

3747.	What is/are main component/s to generate electricity in dams?
Answer» What is/are main component/s to generate electricity in dams?

Discussion

3748.	a point charge of 2 micro C is placed at centre of cubic gaussain surface 9 cm on sdge what is net electric flux through surface
Answer» a point charge of 2 micro C is placed at centre of cubic gaussain surface 9 cm on sdge what is net electric flux through surface

Discussion

3749.	The expansion in all solids of equal size when their temperature is increased by the same amount is the same. Do you agree? Give reasons.
Answer» The expansion in all solids of equal size when their temperature is increased by the same amount is the same. Do you agree? Give reasons.

Discussion

3750.	Which of the following mirrors can give the full image of a large building?
Answer» Which of the following mirrors can give the full image of a large building?

Discussion

Explore topic-wise InterviewSolutions in .

A steel rod of length 6 m and diameter 20 mm is fixed between two rigid support. Determine the stress in the rod, when the temperature increases by 80 ∘C and the ends yield of 1 mm is allowed.Take Young's modulus, Y=2×106 N/cm2 and thermal coefficient of linear expansion, α=12×10−6/ ∘C.

One morning Ram and Rajat were talking to each other face to face at madiwala crossing signal. If Rajat's shadow was exactly to the left of Ram and in west direction, which direction was Ram facing?

A box follows a path to reach from point A to B. The actual length of the path is 5 m in the direction of the force. If a force of 5 N acts on the box then what is the work done by the box?

A solenoid 1.5m long and 4.0cm in diameter possesses 10turns/cm .A current of 5A is flowing through it .Then the magnetic induction inside is?

Which of the following energy conversions take place in a torch?

14.If the resistance of the upper half of rigid loop is twice of that of lower half the magnitude of magnetic induction is equal to

A train travels 40 km at a uniform speed of 30 kmph. Its average speed after travelling another 40 km is 45 kmph for the whole journey. Its speed in the second half of the journey is

Question 4 When a switch is in OFF position, (i) circuit starting from the positive terminal of the cell stops at the switch (ii) circuit is open (iii) no current flows through it. (iv) current flows after some time Choose the combination of correct answer from the following.

Which of the following phenomenon occurs during daytime?

When an iron piece of irregular shape is immersed in a container containing water of 12 ml, the water rises to 30 ml. The volume of the iron is _____.

an object moving on a rec†an gular track of dimension 6m \ast8m travels each meter in 1 seconds what will be its dis†an ce travelled and displacement in 42 secon

Which propert of the magnet can help us prove that earth acts like a huge magnet ?

21. The equilibrium constant KP is 4 for the reaction H2(g)+CO2(g)\updownarrow H2O+CO. at 1660^° C. Initially 0.8 mole of H2 and CO2 are both injected into 5 litre flask. What is the equilibrium concentration of CO2??

83.why electric current creates a magnet field ? and why magnet attract materials?

PROVE THAT If an object moves towards or away from aplane mirror at a speed v the image will approach at same speed v.and also relative velocity ofimage with respect to object is 2v.

67.Two closed organ pipes 100 cm and 101 cm long gives 16 beats in 20s when each pipe is sounded in its fundamental mode . calaculate velocity of sound ? A)303m/s B)332m/s C)323.2m/s D)300m/s

Explain the phenomenon of land breeze and sea breeze with diagrams.

A coil of wire wound around a soft iron bar is called an electromagnet. When does an electromagnet act like a magnet?

how a glass rod experiences positive charge by rubbing it with silk cloth and ebonite rod having negative charge by rubbing it with fur

111.Ques-Assertion reason based A: A system displaying a hysteresis loop such as a ferromagnet is a device for storing memory. R: Magnetisation of a ferromagnet is not a single valued function of the magnetising field rather it depends both on the field and also on history of magnetisation.

How do you know when the needle is pointing north?

Which of the following is/are true with respect to electromagnets?

99.3The resistance of a wire is 'R' ohm is melted and stretched 'n' times its original length, its new resistance will be ?

77.An athlete completes one round of a circular track of diameter 200m in 40sec. What will be the covered and the displacement at the end of 2min.20sec.??

100. What is the work done by the field in rotating� a dipole?

what is the sure check of charge acquired on a body?

Question 15Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?

Why do we see lightning first and then after a moment we hear the thunder?

Why air bubble inside the water behaves like a diverging lens

Question 22 How is sound produced and how is it transmitted and heard by us?

A simple circuit consists of___.

Question 2Why is the weight of an object on the moon 16th its weight on the earth?

In the given figure if the mirror is rotated by an angle θ in the clockwise direction. Then the angle of incidence becomes equal to:

In a given U− shaped tube, open at the left end as that of the right end is closed, if the pressure above the liquid in the right arm is P, find the value of P. Given d1=2×13.6 g/cm3 and d2=13.6 g/ cm3.[Atmospheric pressure Pa=76 cm of Hg]

An ___ is a material which does not allow electricity to pass through.

What is the special feature of taps at railway stations?

Two sealed containers 'A' and 'B' are taken to outer space where there is neither gravity nor atmosphere. Container 'A' is filled with water and container 'B' is filled with air. Choose the correct observation(s)?

The temperature at which the rms velocity of SO2(g) is same as that of O2(g) at 320 K, is Options:a- 320^° C b- 640^° C c- 320k d-640 K

What is the difference between simple ratio and whole ratio?

Define thermometers. What are the 2 types of thermometers? State the difference between the two.

if a particle is moving with cons†an t speed of 20m/s. What is the magnitude of average accelaration.

Air contains nearly 20% oxygen by volume.The volume of air needed for completecombustion of 100 ml. of acetylene will be

Give reasons (a) Even when the water at the surface of a lake is frozen, aquatic animals continue to live below the ice. (b) It is easier to swim in sea water. (c) Water is said to be a universal solvent. (d) Water is an ideal medium for chemical reactions.

What is/are main component/s to generate electricity in dams?

a point charge of 2 micro C is placed at centre of cubic gaussain surface 9 cm on sdge what is net electric flux through surface

The expansion in all solids of equal size when their temperature is increased by the same amount is the same. Do you agree? Give reasons.

Which of the following mirrors can give the full image of a large building?