6277 + Interview Questions in Physics Page 46 InterviewSolution

2251.	42.A particle moves in a straight line and it's position x at time t is given by x^2=2+t .it's acceleration is given by (1)-2/x^3. (2)-1/4x^3. (3)-1/4x^2. (4)1/x^2
Answer» 42.A particle moves in a straight line and it's position x at time t is given by x^2=2+t .it's acceleration is given by (1)-2/x^3. (2)-1/4x^3. (3)-1/4x^2. (4)1/x^2

Discussion

2252.	explain nuclear energy
Answer» explain nuclear energy

Discussion

2253.	Fill in the blanks. (a) Man can hear sounds of frequencies between 20 and ………… Hz. (b) Amplitude and ………… are not related. (c) The period of oscillation depends upon the ………… of the pendulum.
Answer» Fill in the blanks. (a) Man can hear sounds of frequencies between 20 and ………… Hz. (b) Amplitude and ………… are not related. (c) The period of oscillation depends upon the ………… of the pendulum.

2253.

Fill in the blanks. (a) Man can hear sounds of frequencies between 20 and ………… Hz. (b) Amplitude and ………… are not related. (c) The period of oscillation depends upon the ………… of the pendulum.

Answer»

Fill in the blanks.

(a) Man can hear sounds of frequencies between 20 and ………… Hz.

(b) Amplitude and ………… are not related.

(c) The period of oscillation depends upon the ………… of the pendulum.

Discussion

2254.	Question 1An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.
Answer» Question 1 An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.

Discussion

2255.	Consider the modulator shown in the figure below:Both the message signals, m1(t) and m2(t) are band-limited to 5 kHz. If f1=20 kHz and fc=2 MHz, then the bandwidth of the output signal s(t) will be
Answer» Consider the modulator shown in the figure below: Both the message signals, $m_{1} (t)$ and $m_{2} (t)$ are band-limited to $5 k H z$ . If $f_{1} = 20 k H z$ and $f_{c} = 2 M H z$ , then the bandwidth of the output signal $s (t)$ will be

Discussion

2256.	In speed and delay study, the average journey time on a stretch of road length of 3 km is 8 minutes. If the average stopped delay is 2 minutes, the average running speed will be _________kmph.30
Answer» In speed and delay study, the average journey time on a stretch of road length of 3 km is 8 minutes. If the average stopped delay is 2 minutes, the average running speed will be _________kmph. 30

Discussion

2257.	Name the three modes of transfer of heat.
Answer» Name the three modes of transfer of heat.

Discussion

2258.	25.The displacement x of a body of mass1kg on smooth horizontal surface as a function of time t is given by x=ttt/3 (where x I'm metres and t in seconds ).Find the work done by the external agent for the first one second.
Answer» 25.The displacement x of a body of mass1kg on smooth horizontal surface as a function of time t is given by x=ttt/3 (where x I'm metres and t in seconds ).Find the work done by the external agent for the first one second.

Discussion

2259.	A battery of 20 cells is charged by 220V with a charging current of 15A. If the emf of each cell is 2V and internal resistance is 0.1ohm,then the series resistance required to be placed in the circuit will be
Answer» A battery of 20 cells is charged by 220V with a charging current of 15A. If the emf of each cell is 2V and internal resistance is 0.1ohm,then the series resistance required to be placed in the circuit will be

Discussion

2260.	Does the value of pure vapour pressure of volatile solvent changes with change in temperature ?
Answer» Does the value of pure vapour pressure of volatile solvent changes with change in temperature ?

Discussion

2261.	give the angle of incidence and angle of reflection for normal incidence
Answer» give the angle of incidence and angle of reflection for normal incidence

Discussion

2262.	A car moves 8km north, 6km 30° west of north and 4km south. Find displacement of car.
Answer» A car moves 8km north, 6km 30° west of north and 4km south. Find displacement of car.

Discussion

2263.	What type of adverb clause is underlined in the sentence? Shut the door carefully so that the cold air doesn’t come inside.
Answer» What type of adverb clause is underlined in the sentence? Shut the door carefully so that the cold air doesn’t come inside.

2263.

What type of adverb clause is underlined in the sentence? Shut the door carefully so that the cold air doesn’t come inside.

Answer»

What type of adverb clause is underlined in the sentence?

Shut the door carefully so that the cold air doesn’t come inside.

Discussion

2264.	A 240 V, series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3Ω. The value of resistance which must be added to obtain rated torque at starting will be
Answer» A 240 V, series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is $0.3 Ω$ . The value of resistance which must be added to obtain rated torque at starting will be

Discussion

2265.	Why Do Stars Appear To Move From East to West?
Answer» Why Do Stars Appear To Move From East to West?

Discussion

2266.	State Ohm’s law. [1 MARK]
Answer» State Ohm’s law. [1 MARK]

Discussion

2267.	A wire is stretched to n times itslength. Then the resistance nowwill increase by(a) n times(b) 1/n times(c) n2 times(d) 1/n2 times
Answer» A wire is stretched to n times itslength. Then the resistance nowwill increase by(a) n times(b) 1/n times(c) n2 times(d) 1/n2 times

Discussion

2268.	Question 9 (ii)Twenty-seven solid iron spheres, each of radius r and surface area S are melted to form a sphere with surface area S'. Find the:(ii) ratio of S and S'.
Answer» Question 9 (ii) Twenty-seven solid iron spheres, each of radius r and surface area S are melted to form a sphere with surface area S'. Find the: (ii) ratio of S and S'.

Discussion

2269.	Question 17Why does the moon change its shape daily?
Answer» Question 17 Why does the moon change its shape daily?

Discussion

2270.	A body goes from C to D with a velocity of 20 m/s and comes back from D to C with a velocity of 30 m/s. The average velocity of the body for the whole journey is
Answer» A body goes from C to D with a velocity of 20 m/s and comes back from D to C with a velocity of 30 m/s. The average velocity of the body for the whole journey is

Discussion

2271.	74.ABCDEF is a hexagon made of 6 equal wires of resistance 1ohm as shown in the figure. The wires AO,BO,CO,DO,EO,FO have also 1ohm resistance. Calculate the equivalent resistance between A and D point using Kirchoff's law.
Answer» 74.ABCDEF is a hexagon made of 6 equal wires of resistance 1ohm as shown in the figure. The wires AO,BO,CO,DO,EO,FO have also 1ohm resistance. Calculate the equivalent resistance between A and D point using Kirchoff's law.

Discussion

2272.	on29 A particle of mass 1 kg located at the positionio3i m has a velocity (i+j+k) m/s. Its angularmomentum about origin in kg m2sis
Answer» on29 A particle of mass 1 kg located at the positionio3i m has a velocity (i+j+k) m/s. Its angularmomentum about origin in kg m2sis

Discussion

2273.	Why can a current pass through a capacitor and not through an open switch ?
Answer» Why can a current pass through a capacitor and not through an open switch ?

Discussion

2274.	Two large parallel thin plates having charge densities +σ and –σ are kept in the XZ planeat a distance‘d’ apart. If a particle mass ‘m’ and charge ‘-q’ remains stationary betweenthe plates, what is the magnitude and direction of this field?
Answer» Two large parallel thin plates having charge densities +σ and –σ are kept in the XZ plane at a distance‘d’ apart. If a particle mass ‘m’ and charge ‘-q’ remains stationary between the plates, what is the magnitude and direction of this field?

Discussion

2275.	A body travels 200 cm in the first two seconds and 220 cm in the next four seconds. The average speed of the body for the entire journey is .
Answer» A body travels 200 cm in the first two seconds and 220 cm in the next four seconds. The average speed of the body for the entire journey is .

Discussion

2276.	Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Can it be used to separate scrap iron from the heap? Explain.
Answer» Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Can it be used to separate scrap iron from the heap? Explain.

Discussion

2277.	when electric bulbs of same power,but different marked voltage are connected in series across the power source,their brightness will be 1.proportional to their marked voltage 2.inversely proportional to their marked voltage 3.proportional to the square of their marked voltages 4.inversely proportional to the square of their marked voltage
Answer» when electric bulbs of same power,but different marked voltage are connected in series across the power source,their brightness will be 1.proportional to their marked voltage 2.inversely proportional to their marked voltage 3.proportional to the square of their marked voltages 4.inversely proportional to the square of their marked voltage

2277.

when electric bulbs of same power,but different marked voltage are connected in series across the power source,their brightness will be 1.proportional to their marked voltage 2.inversely proportional to their marked voltage 3.proportional to the square of their marked voltages 4.inversely proportional to the square of their marked voltage

Answer»

when electric bulbs of same power,but different marked voltage are connected in series across the power source,their brightness will be

1.proportional to their marked voltage

2.inversely proportional to their marked voltage

3.proportional to the square of their marked voltages

4.inversely proportional to the square of their marked voltage

Discussion

2278.	6. If the diameter of cross-section of a wire is decreased by 5% how much percent will the length be increased so that the volume remains the same ?
Answer» 6. If the diameter of cross-section of a wire is decreased by 5% how much percent will the length be increased so that the volume remains the same ?

Discussion

2279.	Why do cricketers wear white clothes when playing in the sun?
Answer» Why do cricketers wear white clothes when playing in the sun?

Discussion

2280.	If L be the length of a bar magnet then separation between the two poles is nearly
Answer» If L be the length of a bar magnet then separation between the two poles is nearly

Discussion

2281.	What kind of lens always forms a virtual image of an object?
Answer» What kind of lens always forms a virtual image of an object?

Discussion

2282.	Figure shows the word written in front of a plane mirror. Show how the word would appear in the mirror.
Answer» Figure shows the word written in front of a plane mirror. Show how the word would appear in the mirror.

Discussion

2283.	Which of the following is not the human-made causes of floods?
Answer» Which of the following is not the human-made causes of floods?

Discussion

2284.	The following diagram shows an incident ray AO and the normal ON on a plane mirror. Find the angle of incidence and angle of reflection.
Answer» The following diagram shows an incident ray AO and the normal ON on a plane mirror. Find the angle of incidence and angle of reflection.

Discussion

2285.	Which one of the following surfaces are the best radiator and absorber of heat?
Answer» Which one of the following surfaces are the best radiator and absorber of heat?

Discussion

2286.	Can we use a laboratory thermometer for measuring body temperature?
Answer» Can we use a laboratory thermometer for measuring body temperature?

Discussion

2287.	Why potential energy decrease with increase in the electric field
Answer» Why potential energy decrease with increase in the electric field

Discussion

2288.	The flow of _________ in an electric circuit is essential, to light up a bulb.
Answer» The flow of _________ in an electric circuit is essential, to light up a bulb.

Discussion

2289.	For water at 0^° C it takes one hour for first 3 mmof ice layer formation. How much time will it takefor next 6 mm of ice formation?
Answer» For water at 0^° C it takes one hour for first 3 mmof ice layer formation. How much time will it takefor next 6 mm of ice formation?

Discussion

2290.	What does the area below velocity – time graph represent?
Answer» What does the area below velocity – time graph represent?

Discussion

2291.	Match the following units of area with their respective conversions.
Answer» Match the following units of area with their respective conversions.

Discussion

2292.	the optical path of a monochromatic light is same if it goes through 4 cm of glass or 4.5 cm of water.If the refractive index of glass is 1.53 . the refractive index of the water i
Answer» the optical path of a monochromatic light is same if it goes through 4 cm of glass or 4.5 cm of water.If the refractive index of glass is 1.53 . the refractive index of the water i

Discussion

2293.	In order to cover a certain distance in a shorter time span, the object should have greater ___ .
Answer» In order to cover a certain distance in a shorter time span, the object should have greater ___ .

Discussion

2294.	Working of solenoid motor
Answer» Working of solenoid motor

Discussion

2295.	Why light is called light and not something else?
Answer» Why light is called light and not something else?

Discussion

2296.	It has been estimated that 30-40 million rupees are spent to bring a megawatt of electricity in our homes. Building a new power plant costs millions. In light of the above statement, discuss the importance of saving electricity.
Answer» It has been estimated that 30-40 million rupees are spent to bring a megawatt of electricity in our homes. Building a new power plant costs millions. In light of the above statement, discuss the importance of saving electricity.

Discussion

2297.	the time period of small oscillation.47. The ear-ring of a lady shown in figure (12-E18) has a3 cm long light suspension wire. (a) Find the time periodof small oscillations if the lady is standing on the ground.(b) The lady now sits in a merry-go-round moving at4 m s in a circle of radius 2 m. Find the time periodof small oscillations of the ear-rinis
Answer» the time period of small oscillation.47. The ear-ring of a lady shown in figure (12-E18) has a3 cm long light suspension wire. (a) Find the time periodof small oscillations if the lady is standing on the ground.(b) The lady now sits in a merry-go-round moving at4 m s in a circle of radius 2 m. Find the time periodof small oscillations of the ear-rinis

Discussion

2298.	What are charges?
Answer» What are charges?

Discussion

2299.	Difference between distance and displacement?
Answer» Difference between distance and displacement?

Discussion

2300.	Give detailed information about how the merchants of olden times used a magnet while travelling.
Answer» Give detailed information about how the merchants of olden times used a magnet while travelling.

Discussion

Explore topic-wise InterviewSolutions in .

42.A particle moves in a straight line and it's position x at time t is given by x^2=2+t .it's acceleration is given by (1)-2/x^3. (2)-1/4x^3. (3)-1/4x^2. (4)1/x^2

explain nuclear energy

Fill in the blanks. (a) Man can hear sounds of frequencies between 20 and ………… Hz. (b) Amplitude and ………… are not related. (c) The period of oscillation depends upon the ………… of the pendulum.

Question 1An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.

Consider the modulator shown in the figure below:Both the message signals, m1(t) and m2(t) are band-limited to 5 kHz. If f1=20 kHz and fc=2 MHz, then the bandwidth of the output signal s(t) will be

In speed and delay study, the average journey time on a stretch of road length of 3 km is 8 minutes. If the average stopped delay is 2 minutes, the average running speed will be _________kmph.30

Name the three modes of transfer of heat.

25.The displacement x of a body of mass1kg on smooth horizontal surface as a function of time t is given by x=t*t*t/3 (where x I'm metres and t in seconds ).Find the work done by the external agent for the first one second.

A battery of 20 cells is charged by 220V with a charging current of 15A. If the emf of each cell is 2V and internal resistance is 0.1ohm,then the series resistance required to be placed in the circuit will be

Does the value of pure vapour pressure of volatile solvent changes with change in temperature ?

give the angle of incidence and angle of reflection for normal incidence

A car moves 8km north, 6km 30° west of north and 4km south. Find displacement of car.

What type of adverb clause is underlined in the sentence? Shut the door carefully so that the cold air doesn’t come inside.

A 240 V, series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3Ω. The value of resistance which must be added to obtain rated torque at starting will be

Why Do Stars Appear To Move From East to West?

State Ohm’s law. [1 MARK]

A wire is stretched to n times itslength. Then the resistance nowwill increase by(a) n times(b) 1/n times(c) n2 times(d) 1/n2 times

Question 9 (ii)Twenty-seven solid iron spheres, each of radius r and surface area S are melted to form a sphere with surface area S'. Find the:(ii) ratio of S and S'.

Question 17Why does the moon change its shape daily?

A body goes from C to D with a velocity of 20 m/s and comes back from D to C with a velocity of 30 m/s. The average velocity of the body for the whole journey is

74.ABCDEF is a hexagon made of 6 equal wires of resistance 1ohm as shown in the figure. The wires AO,BO,CO,DO,EO,FO have also 1ohm resistance. Calculate the equivalent resistance between A and D point using Kirchoff's law.

on29 A particle of mass 1 kg located at the positionio3i m has a velocity (i+j+k) m/s. Its angularmomentum about origin in kg m2sis

Why can a current pass through a capacitor and not through an open switch ?

Two large parallel thin plates having charge densities +σ and –σ are kept in the XZ planeat a distance‘d’ apart. If a particle mass ‘m’ and charge ‘-q’ remains stationary betweenthe plates, what is the magnitude and direction of this field?

A body travels 200 cm in the first two seconds and 220 cm in the next four seconds. The average speed of the body for the entire journey is .

Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Can it be used to separate scrap iron from the heap? Explain.

6. If the diameter of cross-section of a wire is decreased by 5% how much percent will the length be increased so that the volume remains the same ?

Why do cricketers wear white clothes when playing in the sun?

If L be the length of a bar magnet then separation between the two poles is nearly

What kind of lens always forms a virtual image of an object?

Figure shows the word written in front of a plane mirror. Show how the word would appear in the mirror.

Which of the following is not the human-made causes of floods?

The following diagram shows an incident ray AO and the normal ON on a plane mirror. Find the angle of incidence and angle of reflection.

Which one of the following surfaces are the best radiator and absorber of heat?

Can we use a laboratory thermometer for measuring body temperature?

Why potential energy decrease with increase in the electric field

The flow of _________ in an electric circuit is essential, to light up a bulb.

For water at 0^° C it takes one hour for first 3 mmof ice layer formation. How much time will it takefor next 6 mm of ice formation?

What does the area below velocity – time graph represent?

Match the following units of area with their respective conversions.

the optical path of a monochromatic light is same if it goes through 4 cm of glass or 4.5 cm of water.If the refractive index of glass is 1.53 . the refractive index of the water i

In order to cover a certain distance in a shorter time span, the object should have greater ___ .

Working of solenoid motor

Why light is called light and not something else?

It has been estimated that 30-40 million rupees are spent to bring a megawatt of electricity in our homes. Building a new power plant costs millions. In light of the above statement, discuss the importance of saving electricity.

What are charges?

Difference between distance and displacement?

Give detailed information about how the merchants of olden times used a magnet while travelling.

25.The displacement x of a body of mass1kg on smooth horizontal surface as a function of time t is given by x=ttt/3 (where x I'm metres and t in seconds ).Find the work done by the external agent for the first one second.