9478 + Interview Questions in Physics Page 5 InterviewSolution

201.	A particle is at rest at t=0.If acceleration of the particle is given as a=sinPIET+COSPIET,IN SI UNITS THEN THE maximum speed of the particle is
Answer» A particle is at rest at t=0.If acceleration of the particle is given as a=sinPIET+COSPIET,IN SI UNITS THEN THE maximum speed of the particle is

Discussion

202.	A student sets up an apparatus to determine the melting point of ice. He takes a beaker half filled with crushed ice and dips a mercury thermometer with an initial reading of room temperature (25ºC) in such a way that the bulb of the thermometer is surrounded by ice. The correct observation obtained by the student is that :(1) Mercury in the thermometer keeps on falling till it reads, −1ºC and becomes constant thereafter(2) temperature falls, reaches 0ºC, then it remains constant even after the whole of the ice has melted(3) the temperature falls in the beginning but starts rising as soon as the ice starts melting(4) temperature falls, reaches 0ºC and remains constant only as long as both ice and water are present in it
Answer» A student sets up an apparatus to determine the melting point of ice. He takes a beaker half filled with crushed ice and dips a mercury thermometer with an initial reading of room temperature (25ºC) in such a way that the bulb of the thermometer is surrounded by ice. The correct observation obtained by the student is that : (1) Mercury in the thermometer keeps on falling till it reads, −1ºC and becomes constant thereafter (2) temperature falls, reaches 0ºC, then it remains constant even after the whole of the ice has melted (3) the temperature falls in the beginning but starts rising as soon as the ice starts melting (4) temperature falls, reaches 0ºC and remains constant only as long as both ice and water are present in it

Discussion

203.	When does a body float in a fluid?
Answer» When does a body float in a fluid?

Discussion

204.	Do electromagnetic forcse depend on any intervening medium or they need
Answer» Do electromagnetic forcse depend on any intervening medium or they need

Discussion

205.	When static, sliding and rolling frictional forces are to be arranged in an increasing order, what would be the correct order? [5 MARKS]
Answer» When static, sliding and rolling frictional forces are to be arranged in an increasing order, what would be the correct order? [5 MARKS]

Discussion

206.	on a sunny day when we enter a poorly lit room why we are not able to see for a while?
Answer» on a sunny day when we enter a poorly lit room why we are not able to see for a while?

Discussion

207.	All forces are non contact forces because there is no actual touch because of repultion of atoms at microscopic level, but friction due to adhesion is formation of bonds of atoms so how is the first statement correct.
Answer» All forces are non contact forces because there is no actual touch because of repultion of atoms at microscopic level, but friction due to adhesion is formation of bonds of atoms so how is the first statement correct.

Discussion

208.	Why is copper a good conductor of electricity but not an electrolyte?
Answer» Why is copper a good conductor of electricity but not an electrolyte?

Discussion

209.	During lightning, which of the following occurs?
Answer» During lightning, which of the following occurs?

Discussion

210.	Name the technique of collecting information about the Earth from an orbiting satellite.
Answer» Name the technique of collecting information about the Earth from an orbiting satellite.

Discussion

211.	Why was she quiet?(i) she was afraid to air her opinions.(ii) she hated the noise.(iii) she didn't like the activity.(iv) she was quiet by nature.
Answer» Why was she quiet? (i) she was afraid to air her opinions. (ii) she hated the noise. (iii) she didn't like the activity. (iv) she was quiet by nature.

211.

Why was she quiet?(i) she was afraid to air her opinions.(ii) she hated the noise.(iii) she didn't like the activity.(iv) she was quiet by nature.

Answer»

Why was she quiet?

(i) she was afraid to air her opinions.

(ii) she hated the noise.

(iii) she didn't like the activity.

(iv) she was quiet by nature.

Discussion

212.	Self adjusting force
Answer» Self adjusting force

Discussion

213.	What is the wave velocity formula?
Answer» What is the wave velocity formula?

Discussion

214.	Find the total resistance of the given circuit.
Answer» Find the total resistance of the given circuit.

Discussion

215.	10. Four charges each equal to Q are placed at the four corners of a square and a charge q is placed at the centre of the square. If the system is in equilibrium then the value of q is ___________________
Answer» 10. Four charges each equal to Q are placed at the four corners of a square and a charge q is placed at the centre of the square. If the system is in equilibrium then the value of q is ___________________

Discussion

216.	Which of the following relations is true for focal length (f) and the radius of curvature (r)?
Answer» Which of the following relations is true for focal length (f) and the radius of curvature (r)?

Discussion

217.	10 identical cells are connected in series to heat the wire of length 1m and radius r by 10 C at time t. How many cells are required to heat the wire of length 2m of same radius by the same temperature at time t?
Answer» 10 identical cells are connected in series to heat the wire of length 1m and radius r by 10 C at time t. How many cells are required to heat the wire of length 2m of same radius by the same temperature at time t?

Discussion

218.	Name the star nearest to the Earth. Why does it appear brighter and hotter than other stars ? How much time is required for light to reach the Earth from this star ? Give the composition of this star. What is the source of energy of this star ?
Answer» Name the star nearest to the Earth. Why does it appear brighter and hotter than other stars ? How much time is required for light to reach the Earth from this star ? Give the composition of this star. What is the source of energy of this star ?

Discussion

219.	Statement 1: Planets revolving around the sun never collide. Statement 2: Planets revolve around the sun in a definite path known as orbit. An orbit does not cross any other orbit.
Answer» Statement 1: Planets revolving around the sun never collide. Statement 2: Planets revolve around the sun in a definite path known as orbit. An orbit does not cross any other orbit.

219.

Statement 1: Planets revolving around the sun never collide. Statement 2: Planets revolve around the sun in a definite path known as orbit. An orbit does not cross any other orbit.

Answer»

Statement 1: Planets revolving around the sun never collide.

Statement 2: Planets revolve around the sun in a definite path known as orbit. An orbit does not cross any other orbit.

Discussion

220.	A puppy, trapped by a current carrying wire, was barking for help. A man passing by used a wooden stick to save it. Why did he prefer wooden stick and not his hands?
Answer» A puppy, trapped by a current carrying wire, was barking for help. A man passing by used a wooden stick to save it. Why did he prefer wooden stick and not his hands?

Discussion

221.	A bottle that is fully filled produces a sound whose pitch compared to a half filled bottle will be:
Answer» A bottle that is fully filled produces a sound whose pitch compared to a half filled bottle will be:

Discussion

222.	Everyone knows that heavier objects require more force to move the same distance than lighter objects. Which law can explain this scenario?
Answer» Everyone knows that heavier objects require more force to move the same distance than lighter objects. Which law can explain this scenario?

Discussion

223.	Give the mathematical expression for the velocity at any instant in the uniform circular motion
Answer» Give the mathematical expression for the velocity at any instant in the uniform circular motion

Discussion

224.	What is the magnitude of the net force acting on the box?
Answer» What is the magnitude of the net force acting on the box?

Discussion

225.	Natural gas is a fossil fuel that is colourless, odourless and tasteless. If this is true then why does it smell when there is a leakage from a gas cylinder used for cooking at home
Answer» Natural gas is a fossil fuel that is colourless, odourless and tasteless. If this is true then why does it smell when there is a leakage from a gas cylinder used for cooking at home

Discussion

226.	Question 1Note is a sound(a) of mixture of several frequencies(b) of mixture of two frequencies only(c) of a single frequency(d) always unpleasant to listen
Answer» Question 1 Note is a sound (a) of mixture of several frequencies (b) of mixture of two frequencies only (c) of a single frequency (d) always unpleasant to listen

Discussion

227.	Identify the resistance from which 5 Amp current is flowing.
Answer» Identify the resistance from which 5 Amp current is flowing.

Discussion

228.

Match the following. ‘A’ ‘B’ (a) Fluid substances 1. Greater pressure (b) Sprinkle irrigation 2. Equal pressure in all directions (c) Blunt weapon 3. Pressure of water (d) Sharp weapon 4. Less pressure

Answer»

Match the following.

‘A’		‘B’
(a)	Fluid substances		1.	Greater pressure
(b)	Sprinkle irrigation		2.	Equal pressure in all directions
(c)	Blunt weapon		3.	Pressure of water
(d)	Sharp weapon		4.	Less pressure

Discussion

229.	What happens to the shape of a tin can filled with hot air when it is kept in a refrigerator?
Answer» What happens to the shape of a tin can filled with hot air when it is kept in a refrigerator?

Discussion

230.	Reaction of zinc with sodium hydroxide is exothermic or endothermic?
Answer» Reaction of zinc with sodium hydroxide is exothermic or endothermic?

Discussion

231.	If a body starting from rest travels with a uniform acceleration of 10 ms-2 for first 10 second and with uniform acceleration 5 ms-2 for next 20 seconds, then average acceleration of the body for 30 s is
Answer» If a body starting from rest travels with a uniform acceleration of 10 ms-2 for first 10 second and with uniform acceleration 5 ms-2 for next 20 seconds, then average acceleration of the body for 30 s is

Discussion

232.	Why do sportsman uses shoes with spikes ?
Answer» Why do sportsman uses shoes with spikes ?

Discussion

233.	A book placed on a desk is pushed towards the right as shown. Identify the direction of frictional force acting on the book.
Answer» A book placed on a desk is pushed towards the right as shown. Identify the direction of frictional force acting on the book.

Discussion

234.	Figure shows the acceleration-time graph of a particle moving along a straight line. After what time the particle acquires its initial velocity?
Answer» Figure shows the acceleration-time graph of a particle moving along a straight line. After what time the particle acquires its initial velocity?

Discussion

235.	51. Find the acceleration of each block
Answer» 51. Find the acceleration of each block

Discussion

236.	Define Force. Is contact necessary for the application of Force?
Answer» Define Force. Is contact necessary for the application of Force?

Discussion

237.	Two bulbs are marked as ‘A’ having rating 60W, 220V & ‘B’ having rating 100W, 220V. They are connected in parallel to a 220 V source. Which of the two will glow brighter?
Answer» Two bulbs are marked as ‘A’ having rating 60W, 220V & ‘B’ having rating 100W, 220V. They are connected in parallel to a 220 V source. Which of the two will glow brighter?

Discussion

238.	what will happen to the image formed by a plane mirror if half of it is covered with black paper
Answer» what will happen to the image formed by a plane mirror if half of it is covered with black paper

Discussion

239.	how does light acts when it travells through more than two medium
Answer» how does light acts when it travells through more than two medium

Discussion

240.	When was the straight line horizontal for origin in acceleration time graph we use .explain
Answer» When was the straight line horizontal for origin in acceleration time graph we use .explain

Discussion

241.	In false vocal chord connected with arytenoid in human larynx?
Answer» In false vocal chord connected with arytenoid in human larynx?

Discussion

242.	What is the difference between contact and non-contact forces? Explain with examples.
Answer» What is the difference between contact and non-contact forces? Explain with examples.

Discussion

243.	A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed at 30 cm from the lens. The image will be
Answer» A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed at 30 cm from the lens. The image will be

Discussion

244.	The velocity of sound at 20°C is approximately
Answer» The velocity of sound at 20°C is approximately

Discussion

245.	Which of the following is/are non-contact force(s)?1. Gravitational Force2. Electrostatic Force3. Muscular Force4. Magnetic Force
Answer» Which of the following is/are non-contact force(s)? 1. Gravitational Force 2. Electrostatic Force 3. Muscular Force 4. Magnetic Force

245.

Which of the following is/are non-contact force(s)?1. Gravitational Force2. Electrostatic Force3. Muscular Force4. Magnetic Force

Answer»

Which of the following is/are non-contact force(s)?

1. Gravitational Force

2. Electrostatic Force

3. Muscular Force

4. Magnetic Force

Discussion

246.	An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into water. The reason for this is
Answer» An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into water. The reason for this is

Discussion

247.	34.The position time graph for a body moving along a straight line between o and a is shown . during it's motion between o and a how many times body come to rest?
Answer» 34.The position time graph for a body moving along a straight line between o and a is shown . during it's motion between o and a how many times body come to rest?

Discussion

248.	Explain why a real image can be projected on a screen but a virtual image cannot. Also, give one example of each type of image.
Answer» Explain why a real image can be projected on a screen but a virtual image cannot. Also, give one example of each type of image.

Discussion

249.	The rate constant for a first order reaction at 300^° C for which E_a is 35 kcal mol^{-1} and frequency constant is 1.45 × 10^{11} s^{-1} is(a) 10 × 10^{-2} s^{-2}(c) 5 x 10^{-4}s^{-1}(b) 5.37 x 10^{10} s^{-1}(d) 7.94 x 10^{-3}s^-^1
Answer» The rate constant for a first order reaction at 300^° C for which E_a is 35 kcal mol^{-1} and frequency constant is 1.45 × 10^{11} s^{-1} is(a) 10 × 10^{-2} s^{-2}(c) 5 x 10^{-4}s^{-1}(b) 5.37 x 10^{10} s^{-1}(d) 7.94 x 10^{-3}s^-^1

Discussion

250.	the length of a spring is l and its force constant is k .When a weight W is suspended from it its length increases by x if the spring is cut into two parts and put in parallel same weight
Answer» the length of a spring is l and its force constant is k .When a weight W is suspended from it its length increases by x if the spring is cut into two parts and put in parallel same weight

Discussion

Explore topic-wise InterviewSolutions in .

A particle is at rest at t=0.If acceleration of the particle is given as a=sinPIET+COSPIET,IN SI UNITS THEN THE maximum speed of the particle is

When does a body float in a fluid?

Do electromagnetic forcse depend on any intervening medium or they need

When static, sliding and rolling frictional forces are to be arranged in an increasing order, what would be the correct order? [5 MARKS]

on a sunny day when we enter a poorly lit room why we are not able to see for a while?

All forces are non contact forces because there is no actual touch because of repultion of atoms at microscopic level, but friction due to adhesion is formation of bonds of atoms so how is the first statement correct.

Why is copper a good conductor of electricity but not an electrolyte?

During lightning, which of the following occurs?

Name the technique of collecting information about the Earth from an orbiting satellite.

Why was she quiet?(i) she was afraid to air her opinions.(ii) she hated the noise.(iii) she didn't like the activity.(iv) she was quiet by nature.

Self adjusting force

What is the wave velocity formula?

Find the total resistance of the given circuit.

10. Four charges each equal to Q are placed at the four corners of a square and a charge q is placed at the centre of the square. If the system is in equilibrium then the value of q is ___________________

Which of the following relations is true for focal length (f) and the radius of curvature (r)?

10 identical cells are connected in series to heat the wire of length 1m and radius r by 10 C at time t. How many cells are required to heat the wire of length 2m of same radius by the same temperature at time t?

Name the star nearest to the Earth. Why does it appear brighter and hotter than other stars ? How much time is required for light to reach the Earth from this star ? Give the composition of this star. What is the source of energy of this star ?

Statement 1: Planets revolving around the sun never collide. Statement 2: Planets revolve around the sun in a definite path known as orbit. An orbit does not cross any other orbit.

A puppy, trapped by a current carrying wire, was barking for help. A man passing by used a wooden stick to save it. Why did he prefer wooden stick and not his hands?

A bottle that is fully filled produces a sound whose pitch compared to a half filled bottle will be:

Everyone knows that heavier objects require more force to move the same distance than lighter objects. Which law can explain this scenario?

Give the mathematical expression for the velocity at any instant in the uniform circular motion

What is the magnitude of the net force acting on the box?

Natural gas is a fossil fuel that is colourless, odourless and tasteless. If this is true then why does it smell when there is a leakage from a gas cylinder used for cooking at home

Question 1Note is a sound(a) of mixture of several frequencies(b) of mixture of two frequencies only(c) of a single frequency(d) always unpleasant to listen

Identify the resistance from which 5 Amp current is flowing.

Match the following. ‘A’ ‘B’ (a) Fluid substances 1. Greater pressure (b) Sprinkle irrigation 2. Equal pressure in all directions (c) Blunt weapon 3. Pressure of water (d) Sharp weapon 4. Less pressure

What happens to the shape of a tin can filled with hot air when it is kept in a refrigerator?

Reaction of zinc with sodium hydroxide is exothermic or endothermic?

If a body starting from rest travels with a uniform acceleration of 10 ms-2 for first 10 second and with uniform acceleration 5 ms-2 for next 20 seconds, then average acceleration of the body for 30 s is

Why do sportsman uses shoes with spikes ?

A book placed on a desk is pushed towards the right as shown. Identify the direction of frictional force acting on the book.

Figure shows the acceleration-time graph of a particle moving along a straight line. After what time the particle acquires its initial velocity?

51. Find the acceleration of each block

Define Force. Is contact necessary for the application of Force?

Two bulbs are marked as ‘A’ having rating 60W, 220V &amp; ‘B’ having rating 100W, 220V. They are connected in parallel to a 220 V source. Which of the two will glow brighter?

what will happen to the image formed by a plane mirror if half of it is covered with black paper

how does light acts when it travells through more than two medium

When was the straight line horizontal for origin in acceleration time graph we use .explain

In false vocal chord connected with arytenoid in human larynx?

What is the difference between contact and non-contact forces? Explain with examples.

A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed at 30 cm from the lens. The image will be

The velocity of sound at 20°C is approximately

Which of the following is/are non-contact force(s)?1. Gravitational Force2. Electrostatic Force3. Muscular Force4. Magnetic Force

An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into water. The reason for this is

34.The position time graph for a body moving along a straight line between o and a is shown . during it's motion between o and a how many times body come to rest?

Explain why a real image can be projected on a screen but a virtual image cannot. Also, give one example of each type of image.

The rate constant for a first order reaction at 300^° C for which E_a is 35 kcal mol^{-1} and frequency constant is 1.45 × 10^{11} s^{-1} is(a) 10 × 10^{-2} s^{-2}(c) 5 x 10^{-4}s^{-1}(b) 5.37 x 10^{10} s^{-1}(d) 7.94 x 10^{-3}s^-^1

the length of a spring is l and its force constant is k .When a weight W is suspended from it its length increases by x if the spring is cut into two parts and put in parallel same weight

Two bulbs are marked as ‘A’ having rating 60W, 220V & ‘B’ having rating 100W, 220V. They are connected in parallel to a 220 V source. Which of the two will glow brighter?