9478 + Interview Questions in Physics Page 55 InterviewSolution

2701.	In case of a simply supported I−section beam of span L and loaded with a central load W, the length of elasto-plastic zone of the plastic hinge is
Answer» In case of a simply supported $I -$ section beam of span $L$ and loaded with a central load $W$ , the length of elasto-plastic zone of the plastic hinge is

Discussion

2702.	Copper and brass can be prevented from corrosion by coating them with thin layer of __________ .
Answer» Copper and brass can be prevented from corrosion by coating them with thin layer of __________ .

Discussion

2703.	A constant force F acts on a stationary body for time t. The distance covered by the body S will be proportional to
Answer» A constant force F acts on a stationary body for time t. The distance covered by the body S will be proportional to

Discussion

2704.	24 identical bulbs are connected in series with a supply voltage of 220 V. These 48 W bulbs are designed to operate at 220 V. Find the power consumed by all the bulbs in the circuit.
Answer» $24$ identical bulbs are connected in series with a supply voltage of $220 V$ . These $48 W$ bulbs are designed to operate at $220 V$ . Find the power consumed by all the bulbs in the circuit.

Discussion

2705.	A 3^°C rise of temperature is observed in a conductor by passing a certain amount of current . When the current is doubled ,the rise of temperature will be-?
Answer» A 3^°C rise of temperature is observed in a conductor by passing a certain amount of current . When the current is doubled ,the rise of temperature will be-?

Discussion

2706.	Which of the following statements is correct?
Answer» Which of the following statements is correct?

Discussion

2707.	The three vessels shown in figure have same base area and equal height. Water is poured in three vessels until they overfill. The force on the base will be
Answer» The three vessels shown in figure have same base area and equal height. Water is poured in three vessels until they overfill. The force on the base will be

2707.

The three vessels shown in figure have same base area and equal height. Water is poured in three vessels until they overfill. The force on the base will be

Answer»

The three vessels shown in figure have same base area and equal height. Water is poured in three vessels until they overfill. The force on the base will be

Discussion

2708.	Question 21A father and son pushed their car to bring it to the side of the road as it had stalled in the middle of the road. They experienced that although they had to push with all their might initially to move the car, the push required to keep the car rolling was smaller, once the car started rolling. Explain.
Answer» Question 21 A father and son pushed their car to bring it to the side of the road as it had stalled in the middle of the road. They experienced that although they had to push with all their might initially to move the car, the push required to keep the car rolling was smaller, once the car started rolling. Explain.

Discussion

2709.	Give two examples of desirable force of friction
Answer» Give two examples of desirable force of friction

Discussion

2710.	WHY DO WE NOT HEAR THE SCREAMS OF A BAT
Answer» WHY DO WE NOT HEAR THE SCREAMS OF A BAT

Discussion

2711.	Name two foods each rich in:i) Vitamin Aii) Vitamin Biii) Vitamin Civ) Vitamin D
Answer» Name two foods each rich in: i) Vitamin A ii) Vitamin B iii) Vitamin C iv) Vitamin D

Discussion

2712.	Explanation about gravitational force
Answer» Explanation about gravitational force

Discussion

2713.	if a particle covers equal displacement in equal time interval but time interval is very large. Ins†an†an eous velocity changes with time .does it is in uniform motion?
Answer» if a particle covers equal displacement in equal time interval but time interval is very large. Ins†an†an eous velocity changes with time .does it is in uniform motion?

Discussion

2714.	In the human eye, the image of an object viewed is formed on:
Answer» In the human eye, the image of an object viewed is formed on:

Discussion

2715.	When light goes from an optically denser to an optically rarer medium,
Answer» When light goes from an optically denser to an optically rarer medium,

Discussion

2716.	Why does the average electric power of an inductor is 0
Answer» Why does the average electric power of an inductor is 0

Discussion

2717.	24.A wedge of mass M makes an angle theta with the horizontal .The wedge is placed on horizontal frictionless surface .A small block of mass M is placed on the inclined surface of wedge .What horizontal force F must be applied to the wedge so that force of friction between the block and wedge is zero
Answer» 24.A wedge of mass M makes an angle theta with the horizontal .The wedge is placed on horizontal frictionless surface .A small block of mass M is placed on the inclined surface of wedge .What horizontal force F must be applied to the wedge so that force of friction between the block and wedge is zero

Discussion

2718.	The word 'AMBULANCE' written on an ambulance reads correctly when reflected in a rear view mirror whereas the number plate does not. Why?
Answer» The word 'AMBULANCE' written on an ambulance reads correctly when reflected in a rear view mirror whereas the number plate does not. Why?

Discussion

2719.	98. Two identically conducting rings are placed very close to each other coaxially.the inductance of each ring =M and each of them carries current In in the same direction.what minimum amount of work has to be done in making their dist so large such that there's no mutual flux linkage
Answer» 98. Two identically conducting rings are placed very close to each other coaxially.the inductance of each ring =M and each of them carries current In in the same direction.what minimum amount of work has to be done in making their dist so large such that there's no mutual flux linkage

Discussion

2720.	What determines the pitch of a sound ?
Answer» What determines the pitch of a sound ?

Discussion

2721.	1.Solve: \sqrt{2x-6 } + \sqrt{x+4} 2. If a, b,c ∈ R, x=a^{2 }-bc, y=b^{2 }-ca, z=c^2-ab then prove that x^3+y^3+z^3 -3xyz is a perfect square.
Answer» 1.Solve: \sqrt{2x-6 } + \sqrt{x+4} 2. If a, b,c ∈ R, x=a^{2 }-bc, y=b^{2 }-ca, z=c^2-ab then prove that x^3+y^3+z^3 -3xyz is a perfect square.

Discussion

2722.	You can measure less than 1/10 of a second but you cannot see it in your wristwatch. Why?
Answer» You can measure less than 1/10 of a second but you cannot see it in your wristwatch. Why?

Discussion

2723.	A massless inextensible string in the form of a loopis placed on a horizontal film of soap solution o surface tension T. If film is pierced inside the loopand it convert into a circular loop of diameter d, thenthe tension produced in string is
Answer» A massless inextensible string in the form of a loopis placed on a horizontal film of soap solution o surface tension T. If film is pierced inside the loopand it convert into a circular loop of diameter d, thenthe tension produced in string is

Discussion

2724.	A tuning fork, of frequency 480 Hz, is used in an experiment for measuring speed of sound (v) in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, l1=30 cm and l2=70 cm. Then v is equal to
Answer» A tuning fork, of frequency $480 Hz$ , is used in an experiment for measuring speed of sound $(v)$ in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, $l_{1} = 30 cm and l_{2} = 70 cm$ . Then $v$ is equal to

Discussion

2725.	a point charge of 6 microcoulomb is placed at a distance of 20 cm directly above the centre of a square of side 40 cm the magnitude of flux through the square
Answer» a point charge of 6 microcoulomb is placed at a distance of 20 cm directly above the centre of a square of side 40 cm the magnitude of flux through the square

Discussion

2726.	Match the column A with column B ColumnAColumnB(i)Cathodea.Attracts negative charges (ii)Anodeb.Extraction of metals(iii)Alcoholc.Electrolyte(iv)Electrometallurgyd.Attracts positive charges e.Non electrolyte
Answer» Match the column A with column B $\begin{matrix} C o l u m n A & C o l u m n B (i)Cathode & a.Attracts negative charges (ii)Anode & b.Extraction of metals (iii)Alcohol & c.Electrolyte (iv)Electrometallurgy & d.Attracts positive charges e.Non electrolyte \end{matrix}$

Discussion

2727.	The string of a violin vibrating in a certain mode emits a note of 205 Hz at its correct tension. The string is tightened slightly and produces six beats in two seconds with a tuning fork of frequency 205 Hz. The new frequency of the note emitted after the string is tightened is
Answer» The string of a violin vibrating in a certain mode emits a note of $205 Hz$ at its correct tension. The string is tightened slightly and produces six beats in two seconds with a tuning fork of frequency $205 Hz$ . The new frequency of the note emitted after the string is tightened is

Discussion

2728.	Name the quantity whose one of the units is pascal (Pa)?
Answer» Name the quantity whose one of the units is pascal (Pa)?

Discussion

2729.	17.A thin wire ring of radius r has an charge q what will be increment of force stretching the wire if a point charge e is placed at the ring center
Answer» 17.A thin wire ring of radius r has an charge q what will be increment of force stretching the wire if a point charge e is placed at the ring center

Discussion

2730.	A 2kg box sits on a 3 kg box which sits on 5 kg box . The 5 kg box rests on table . What is the normal force exerted on 5 kg box by the table top ?
Answer» A 2kg box sits on a 3 kg box which sits on 5 kg box . The 5 kg box rests on table . What is the normal force exerted on 5 kg box by the table top ?

Discussion

2731.	Question 9Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.
Answer» Question 9 Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.

Discussion

2732.	Figure shows two blocks A and B, each having a mass of 320 g connected by a light string passing over a smooth light pulley. The horizontal surface on which the block A can slide is smooth. The block A is attached to a spring of spring constant 40 N/m whose other end is fixed to a support 40 cm above the horizontal surface. Initially, the spring is vertical and unstretched when the system is released to move. Find the velocity of the block A at the instant it breaks off the surface below it. Take g = 10 m/s2.
Answer» Figure shows two blocks A and B, each having a mass of 320 g connected by a light string passing over a smooth light pulley. The horizontal surface on which the block A can slide is smooth. The block A is attached to a spring of spring constant 40 N/m whose other end is fixed to a support 40 cm above the horizontal surface. Initially, the spring is vertical and unstretched when the system is released to move. Find the velocity of the block A at the instant it breaks off the surface below it. Take g = 10 m/ $s^{2}$ .

2732.

Figure shows two blocks A and B, each having a mass of 320 g connected by a light string passing over a smooth light pulley. The horizontal surface on which the block A can slide is smooth. The block A is attached to a spring of spring constant 40 N/m whose other end is fixed to a support 40 cm above the horizontal surface. Initially, the spring is vertical and unstretched when the system is released to move. Find the velocity of the block A at the instant it breaks off the surface below it. Take g = 10 m/s2.

Answer»

Figure shows two blocks A and B, each having a mass of 320 g connected by a light string passing over a smooth light pulley. The horizontal surface on which the block A can slide is smooth. The block A is attached to a spring of spring constant 40 N/m whose other end is fixed to a support 40 cm above the horizontal surface. Initially, the spring is vertical and unstretched when the system is released to move. Find the velocity of the block A at the instant it breaks off the surface below it. Take g = 10 m/ $s^{2}$ .

Discussion

2733.	Derivation of relation between r and f for marginal rays for curved surface mirror.
Answer» Derivation of relation between r and f for marginal rays for curved surface mirror.

Discussion

2734.	A person who hits a wall gets hurt more than a person hitting a piece of sponge with an equal force. Explain and mention the law related to it.
Answer» A person who hits a wall gets hurt more than a person hitting a piece of sponge with an equal force. Explain and mention the law related to it.

Discussion

2735.	How will a person take the reading of a fluid kept in a container with a laboratory thermometer?
Answer» How will a person take the reading of a fluid kept in a container with a laboratory thermometer?

Discussion

2736.	11.Two identical capacitors A and B are charged to the same potential V and are connected in two circuits at t =0,as shown in figure.The charge on the capacitors at time t=CR are respectively a)VC, VC b)VC/e,VC c)VC,VC/e d)VC/e,VC/e
Answer» 11.Two identical capacitors A and B are charged to the same potential V and are connected in two circuits at t =0,as shown in figure.The charge on the capacitors at time t=CR are respectively a)VC, VC b)VC/e,VC c)VC,VC/e d)VC/e,VC/e

Discussion

2737.	Explain why(a) we wear woolen clothes in winter.(b) the water pipes are covered with cotton during very cold weather.
Answer» Explain why (a) we wear woolen clothes in winter. (b) the water pipes are covered with cotton during very cold weather.

Discussion

2738.	Question 15 The power of a motor pump is 2 kW. How much water per minute the pump can raise to a height of 10 m? (Given g=10ms−2)
Answer» Question 15 The power of a motor pump is 2 kW. How much water per minute the pump can raise to a height of 10 m? (Given $g = 10 m s^{- 2}$ )

Discussion

2739.	What is the anomalous expansion of water, and how does it help aquatic life?
Answer» What is the anomalous expansion of water, and how does it help aquatic life?

Discussion

2740.	What are cylindrical lenses that are used during the visual defect astigmatism and their function?
Answer» What are cylindrical lenses that are used during the visual defect astigmatism and their function?

Discussion

2741.	Why does leaning tower of Pesa not fall?
Answer» Why does leaning tower of Pesa not fall?

Discussion

2742.	Shrillness of a sound is determined by the _______ of vibration.
Answer» Shrillness of a sound is determined by the _______ of vibration.

Discussion

2743.	Explain the process of lightning.
Answer» Explain the process of lightning.

Discussion

2744.	a body of weight 72N moves from the surface of earth at a height half of radius of the earth then gravitational force exerted on it will be
Answer» a body of weight 72N moves from the surface of earth at a height half of radius of the earth then gravitational force exerted on it will be

Discussion

2745.	if gravitational force is acting on every object present on earth then why aeroplane is able to fly why dont it get crashed ot land.
Answer» if gravitational force is acting on every object present on earth then why aeroplane is able to fly why dont it get crashed ot land.

Discussion

2746.	The prefix ‘super-’ means _______.
Answer» The prefix ‘super-’ means _______.

Discussion

2747.	Will you be able to drink water in space using a straw? why/why don't?
Answer» Will you be able to drink water in space using a straw? why/why don't?

Discussion

2748.	A tester to detect weak currents should use
Answer» A tester to detect weak currents should use

Discussion

2749.	Q- In the case when 2 soaps bubbles are attached , the smaller soap is of radius r1 and has pressure p1 & the bigger bubble has radius r2 and has pressure p2. Calculate the radius of surface formed in the interface of two bubbles.
Answer» Q- In the case when 2 soaps bubbles are attached , the smaller soap is of radius r1 and has pressure p1 & the bigger bubble has radius r2 and has pressure p2. Calculate the radius of surface formed in the interface of two bubbles.

Discussion

2750.	A disc clutch with a single friction surface has coefficient of friction equal to 0.3. The maximum pressure which can be imposed on the friction material is 1.5 MPa. the outer diameter of the clutch plate is 200 mm and its internal diameter is 100 mm. Assuming uniform wear theory for the clutch plate, the maximum torque (in Nm) that can be transmitted is 530.14
Answer» A disc clutch with a single friction surface has coefficient of friction equal to 0.3. The maximum pressure which can be imposed on the friction material is 1.5 MPa. the outer diameter of the clutch plate is 200 mm and its internal diameter is 100 mm. Assuming uniform wear theory for the clutch plate, the maximum torque (in Nm) that can be transmitted is 530.14

Discussion

Explore topic-wise InterviewSolutions in .

In case of a simply supported I−section beam of span L and loaded with a central load W, the length of elasto-plastic zone of the plastic hinge is

Copper and brass can be prevented from corrosion by coating them with thin layer of __________ .

A constant force F acts on a stationary body for time t. The distance covered by the body S will be proportional to

24 identical bulbs are connected in series with a supply voltage of 220 V. These 48 W bulbs are designed to operate at 220 V. Find the power consumed by all the bulbs in the circuit.

A 3^°C rise of temperature is observed in a conductor by passing a certain amount of current . When the current is doubled ,the rise of temperature will be-?

Which of the following statements is correct?

The three vessels shown in figure have same base area and equal height. Water is poured in three vessels until they overfill. The force on the base will be

Give two examples of desirable force of friction

WHY DO WE NOT HEAR THE SCREAMS OF A BAT

Name two foods each rich in:i) Vitamin Aii) Vitamin Biii) Vitamin Civ) Vitamin D

Explanation about gravitational force

if a particle covers equal displacement in equal time interval but time interval is very large. Ins†an†an eous velocity changes with time .does it is in uniform motion?

In the human eye, the image of an object viewed is formed on:

When light goes from an optically denser to an optically rarer medium,

Why does the average electric power of an inductor is 0

The word 'AMBULANCE' written on an ambulance reads correctly when reflected in a rear view mirror whereas the number plate does not. Why?

98. Two identically conducting rings are placed very close to each other coaxially.the inductance of each ring =M and each of them carries current In in the same direction.what minimum amount of work has to be done in making their dist so large such that there's no mutual flux linkage

What determines the pitch of a sound ?

1.Solve: \sqrt{2x-6 } + \sqrt{x+4} 2. If a, b,c ∈ R, x=a^{2 }-bc, y=b^{2 }-ca, z=c^2-ab then prove that x^3+y^3+z^3 -3xyz is a perfect square.

You can measure less than 1/10 of a second but you cannot see it in your wristwatch. Why?

A massless inextensible string in the form of a loopis placed on a horizontal film of soap solution o surface tension T. If film is pierced inside the loopand it convert into a circular loop of diameter d, thenthe tension produced in string is

A tuning fork, of frequency 480 Hz, is used in an experiment for measuring speed of sound (v) in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, l1=30 cm and l2=70 cm. Then v is equal to

a point charge of 6 microcoulomb is placed at a distance of 20 cm directly above the centre of a square of side 40 cm the magnitude of flux through the square

Match the column A with column B ColumnAColumnB(i)Cathodea.Attracts negative charges (ii)Anodeb.Extraction of metals(iii)Alcoholc.Electrolyte(iv)Electrometallurgyd.Attracts positive charges e.Non electrolyte

The string of a violin vibrating in a certain mode emits a note of 205 Hz at its correct tension. The string is tightened slightly and produces six beats in two seconds with a tuning fork of frequency 205 Hz. The new frequency of the note emitted after the string is tightened is

Name the quantity whose one of the units is pascal (Pa)?

17.A thin wire ring of radius r has an charge q what will be increment of force stretching the wire if a point charge e is placed at the ring center

A 2kg box sits on a 3 kg box which sits on 5 kg box . The 5 kg box rests on table . What is the normal force exerted on 5 kg box by the table top ?

Question 9Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.

Derivation of relation between r and f for marginal rays for curved surface mirror.

A person who hits a wall gets hurt more than a person hitting a piece of sponge with an equal force. Explain and mention the law related to it.

How will a person take the reading of a fluid kept in a container with a laboratory thermometer?

11.Two identical capacitors A and B are charged to the same potential V and are connected in two circuits at t =0,as shown in figure.The charge on the capacitors at time t=CR are respectively a)VC, VC b)VC/e,VC c)VC,VC/e d)VC/e,VC/e

Explain why(a) we wear woolen clothes in winter.(b) the water pipes are covered with cotton during very cold weather.

Question 15 The power of a motor pump is 2 kW. How much water per minute the pump can raise to a height of 10 m? (Given g=10ms−2)

What is the anomalous expansion of water, and how does it help aquatic life?

What are cylindrical lenses that are used during the visual defect astigmatism and their function?

Why does leaning tower of Pesa not fall?

Shrillness of a sound is determined by the _______ of vibration.

Explain the process of lightning.

a body of weight 72N moves from the surface of earth at a height half of radius of the earth then gravitational force exerted on it will be

if gravitational force is acting on every object present on earth then why aeroplane is able to fly why dont it get crashed ot land.

The prefix ‘super-’ means _______.

Will you be able to drink water in space using a straw? why/why don't?

A tester to detect weak currents should use

Q- In the case when 2 soaps bubbles are attached , the smaller soap is of radius r1 and has pressure p1 & the bigger bubble has radius r2 and has pressure p2. Calculate the radius of surface formed in the interface of two bubbles.