13232 + Interview Questions in Physics Page 57 InterviewSolution

2801.	State three characteristics of the medium required for propagation of sound?
Answer» State three characteristics of the medium required for propagation of sound?

Discussion

2802.	The green house gas is: (a) oxygen (b) nitrogen (c) chlorine (d) carbon dioxide.
Answer» The green house gas is: (a) oxygen (b) nitrogen (c) chlorine (d) carbon dioxide.

2802.

The green house gas is: (a) oxygen (b) nitrogen (c) chlorine (d) carbon dioxide.

Answer»

The green house gas is:

(a) oxygen (b) nitrogen

(c) chlorine (d) carbon dioxide.

Discussion

2803.	Explain the factors affecting the value of ‘g’
Answer» Explain the factors affecting the value of ‘g’

Discussion

2804.	A girl moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the girl at the end of 2 minutes 20 seconds?
Answer» A girl moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the girl at the end of 2 minutes 20 seconds?

Discussion

2805.	Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one body is 36 g and its density is 9 g/cc. If the mass of the other is 48 g, its density in g/cc is 1. 4/3 2. 3/2 3. 3 4. 5
Answer» Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one body is 36 g and its density is 9 g/cc. If the mass of the other is 48 g, its density in g/cc is 1. 4/3 2. 3/2 3. 3 4. 5

Discussion

2806.	Question 10Paheli had heard that rain water is as good as distilled water. So, she collected some rain water in a clean glass tumbler and tested it using a tester. To her surprise, she found that the compass needle showed deflection. What could be the reasons?
Answer» Question 10 Paheli had heard that rain water is as good as distilled water. So, she collected some rain water in a clean glass tumbler and tested it using a tester. To her surprise, she found that the compass needle showed deflection. What could be the reasons?

Discussion

2807.	A runner completes one round of a circular track of diameter 400 m in 40 s. What will be the distance covered and the displacement respectively at the end of 2 minutes 20 s?
Answer» A runner completes one round of a circular track of diameter 400 m in 40 s. What will be the distance covered and the displacement respectively at the end of 2 minutes 20 s?

Discussion

2808.	What is the distance between stars expressed in light years? What do you understand nby the statement that a star is eight years away from the earth
Answer» What is the distance between stars expressed in light years? What do you understand nby the statement that a star is eight years away from the earth

Discussion

2809.	An ideal transformer has 50 turns in its primary winding and 25 turns in its secondary winding. If the current in the secondary winding is 4 A, then the value of current (in A) in the primary winding if a 200 V AC is applied across it is :(Integer only)
Answer» An ideal transformer has $50$ turns in its primary winding and $25$ turns in its secondary winding. If the current in the secondary winding is $4 A$ , then the value of current (in $A$ ) in the primary winding if a $200 V A C$ is applied across it is :(Integer only)

Discussion

2810.	A bullet train starts from rest, and acquires a speed of 25 ms−1 in 20 s. Assuming uniform acceleration calculate the distance covered by the train in 20 s.
Answer» A bullet train starts from rest, and acquires a speed of $25 m s^{- 1}$ in $20 s$ . Assuming uniform acceleration calculate the distance covered by the train in $20 s$ .

Discussion

2811.	Relate the image distance (v), object distance (u) , image height (h′) and object height (h) to the formula of magnification (M) for a mirror.
Answer» Relate the image distance ( $v$ ), object distance ( $u$ ) , image height ( $h^{^{'}}$ ) and object height ( $h$ ) to the formula of magnification $(M)$ for a mirror.

Discussion

2812.	How much solar energy will be received by 1 square metre area on earth's atmosphere in one hour if the Solar constant were 1.4 Kilowatt per square metre? (assume the rays are falling perpendicular to the Earth's atmosphere)
Answer» How much solar energy will be received by 1 square metre area on earth's atmosphere in one hour if the Solar constant were 1.4 Kilowatt per square metre? (assume the rays are falling perpendicular to the Earth's atmosphere)

Discussion

2813.	An iron ball of mass 100 gm moving at a speed of 10 m/sec strikes a wall at angle of 30 degree and reflects at the same angle . If ball and wall remain in contact for 0.1sec, the force exerted on the wall will be how much
Answer» An iron ball of mass 100 gm moving at a speed of 10 m/sec strikes a wall at angle of 30 degree and reflects at the same angle . If ball and wall remain in contact for 0.1sec, the force exerted on the wall will be how much

Discussion

2814.	work done in extending a spring by Io is wo. work done in further extension Io is
Answer» work done in extending a spring by Io is wo. work done in further extension Io is

Discussion

2815.	ntA tuning fork vibrating with a sonometer, having tension in the wire as T, produces 4 beats per sec. The beat frequency does not change when the tension in the wire changes to 1.21T. Find the frequency of the tuning fork assuming that the sonometer wire is vibrating in the same mode in both of the two cases.n
Answer» ntA tuning fork vibrating with a sonometer, having tension in the wire as T, produces 4 beats per sec. The beat frequency does not change when the tension in the wire changes to 1.21T. Find the frequency of the tuning fork assuming that the sonometer wire is vibrating in the same mode in both of the two cases.n

Discussion

2816.	37.In uniform circular motion 1.magnitude of centripetal force remains constant 2.magnitude and direction of centripetal force remains constant . Which is true (with expanation).
Answer» 37.In uniform circular motion 1.magnitude of centripetal force remains constant 2.magnitude and direction of centripetal force remains constant . Which is true (with expanation).

Discussion

2817.	2.A ball is thrown vertically upward from a tower with velocity 10 m/sec.Another ball is thrown vertically downward with same speed.The balls reach the bottom of the tower having ratio of velocity_
Answer» 2.A ball is thrown vertically upward from a tower with velocity 10 m/sec.Another ball is thrown vertically downward with same speed.The balls reach the bottom of the tower having ratio of velocity_

Discussion

2818.	Question 14If any explosion takes place at the bottom of a lake, what type of shock waves in water will take place?
Answer» Question 14 If any explosion takes place at the bottom of a lake, what type of shock waves in water will take place?

Discussion

2819.	On the Celsius scale the absolute zero temperature is at:
Answer» On the Celsius scale the absolute zero temperature is at:

Discussion

2820.	What is variable velocity?
Answer» What is variable velocity?

Discussion

2821.	Two friends on roller skates are standing 5 m apart from each other . One of them throws a ball of 2 kg towards the other , who catches it, How will this activity affect the position of the two ? Explain your answer .
Answer» Two friends on roller skates are standing 5 m apart from each other . One of them throws a ball of 2 kg towards the other , who catches it, How will this activity affect the position of the two ? Explain your answer .

Discussion

2822.	Bus X travels a distance of 360 km in 5 hours whereas bus Y travels a distance of 476 km in 7 hours. Which bus travels faster?
Answer» Bus X travels a distance of 360 km in 5 hours whereas bus Y travels a distance of 476 km in 7 hours. Which bus travels faster?

Discussion

2823.	9.How the spark coming out of a grinding stone and mud from wheels of a moving vehicle represent inertia of direction
Answer» 9.How the spark coming out of a grinding stone and mud from wheels of a moving vehicle represent inertia of direction

Discussion

2824.	26.The deflection magnetometer is most sensitive when the deflection theta is -(1) nearly 0 degree (2) nearly 30 degree (3) nearly 45 degree (4) nearly 90 degree
Answer» 26.The deflection magnetometer is most sensitive when the deflection theta is -(1) nearly 0 degree (2) nearly 30 degree (3) nearly 45 degree (4) nearly 90 degree

Discussion

2825.	13.If the Eºcell for a given reaction has a negative value, which of the following gives the correct relationships for the values of G^° and Keq?
Answer» 13.If the Eºcell for a given reaction has a negative value, which of the following gives the correct relationships for the values of G^° and Keq?

Discussion

2826.	What is the work done in moving a charge of 0.4 C across two points having a potential difference of 8 V?
Answer» What is the work done in moving a charge of 0.4 C across two points having a potential difference of 8 V?

Discussion

2827.	Question 1What is meant by power of accommodation of the eye?
Answer» Question 1 What is meant by power of accommodation of the eye?

Discussion

2828.	What type of frequencies do bats use for echolocation?
Answer» What type of frequencies do bats use for echolocation?

Discussion

2829.	What is θ in W=F×s×cos θ
Answer» What is $θ$ in $W = F \times s \times c o s θ$

Discussion

2830.	38. What is angular velocity
Answer» 38. What is angular velocity

Discussion

2831.	A plastic disc of diameter 22 cm and thickness 34 cm has a mass of 125 g. For the disc to float on a liquid, which of the following cannot be the value of density of the liquid?
Answer» A plastic disc of diameter $22 c m$ and thickness $\frac{3}{4} c m$ has a mass of $125 g$ . For the disc to float on a liquid, which of the following cannot be the value of density of the liquid?

Discussion

2832.	at the first minimum adjacent to the central maximum of a single silt diffraction pattern the phase difference between the hygens wavelet from the edge of the silt and the wavelet from the midpoint of the silt is
Answer» at the first minimum adjacent to the central maximum of a single silt diffraction pattern the phase difference between the hygens wavelet from the edge of the silt and the wavelet from the midpoint of the silt is

Discussion

2833.	Question 2You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?
Answer» Question 2 You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?

Discussion

2834.	A cube of side ‘a’ and mass ‘m’ is lying on a rough horizontal floor. A force F is applied at the top. The maximum force that must be applied on cube so that it does not topple about A (consider it does not slip)
Answer» A cube of side ‘a’ and mass ‘m’ is lying on a rough horizontal floor. A force F is applied at the top. The maximum force that must be applied on cube so that it does not topple about A (consider it does not slip)

Discussion

2835.	A train of 150 m length is going towards North at a speed of 36 km/h. A bird is flying at 18 km/h parallel to track towards South. Find the time taken by the bird to cross the train.
Answer» A train of 150 m length is going towards North at a speed of 36 km/h. A bird is flying at 18 km/h parallel to track towards South. Find the time taken by the bird to cross the train.

Discussion

2836.	11. A smooth and bottomless tunnel is dug through the centre of earth. A particle is released from thesurface of earth into the tunnel. Time to reach at adistance R/2 from other end of tunnel is(approximately) equal to (where R Radius of earth) (1) 56.4 minute(3) 42.3 minute(2) 7.05 minute(4) 28.2 minute
Answer» 11. A smooth and bottomless tunnel is dug through the centre of earth. A particle is released from thesurface of earth into the tunnel. Time to reach at adistance R/2 from other end of tunnel is(approximately) equal to (where R Radius of earth) (1) 56.4 minute(3) 42.3 minute(2) 7.05 minute(4) 28.2 minute

Discussion

2837.	Starting from rest, Deepak paddles his bicycle to attain a velocity of 6 m/s in 30 seconds then he applies brakes so that the velocity of the bicycle comes down to 4 m/s in the next 5 seconds. Calculate the acceleration of the bicycle in both the cases. [2 MARKS]
Answer» Starting from rest, Deepak paddles his bicycle to attain a velocity of 6 m/s in 30 seconds then he applies brakes so that the velocity of the bicycle comes down to 4 m/s in the next 5 seconds. Calculate the acceleration of the bicycle in both the cases. [2 MARKS]

Discussion

2838.	As shown in the figure, a particle of mass 10 kg is placed at a point A. When the particle is slightly displaced to its right, it starts moving and reaches the point B. The speed of the particle at B is x m/s. (Take g=10 m/s2) The value of x to the nearest integer is .
Answer» As shown in the figure, a particle of mass $10 kg$ is placed at a point $A$ . When the particle is slightly displaced to its right, it starts moving and reaches the point $B$ . The speed of the particle at $B$ is $x m/s$ . (Take $g = 10 {m/s}^{2}$ ) The value of $x$ to the nearest integer is .

Discussion

2839.	4.Under the concept of buoyancy a block of wood of density 800 kg/m3 is supporting a 50 kg stone just above water. For such critical flotation the minimum volume of wooden block required is
Answer» 4.Under the concept of buoyancy a block of wood of density 800 kg/m3 is supporting a 50 kg stone just above water. For such critical flotation the minimum volume of wooden block required is

Discussion

2840.	e²/4π€=[F*d²] how??
Answer» e²/4π€=[F*d²] how??

Discussion

2841.	A body weighs 49 N on a spring balance at the North Pole. What will be its weight recorded on the same weighing machine, if it is shifted to the equator? [Use, g=GMR2=9.8 m/s2 and radius of earth, R=6400 km]
Answer» A body weighs $49 N$ on a spring balance at the North Pole. What will be its weight recorded on the same weighing machine, if it is shifted to the equator? $[$ Use, $g = \frac{G M}{R^{2}} = 9.8 {m/s}^{2}$ and radius of earth, $R = 6400 km]$

Discussion

2842.	Centre of gravity of a triangle is _________.
Answer» Centre of gravity of a triangle is _________.

Discussion

2843.	List the various problems faced by a kid having problems with walking.
Answer» List the various problems faced by a kid having problems with walking.

Discussion

2844.	26.A body covers 10m in 4th s and 15m in 6th s of its uniformly accelerated motion. How far will it travel in the next 3 seconds
Answer» 26.A body covers 10m in 4th s and 15m in 6th s of its uniformly accelerated motion. How far will it travel in the next 3 seconds

Discussion

2845.	12. A small point charge is hanged by an insulatingthread between two fixed and charged parallelplates as shown in figure. The net force on pointcharge is(1) Towards plate A(3) Zero(2) Towards plate B(Ay Upward2019 4-28 22:3
Answer» 12. A small point charge is hanged by an insulatingthread between two fixed and charged parallelplates as shown in figure. The net force on pointcharge is(1) Towards plate A(3) Zero(2) Towards plate B(Ay Upward2019 4-28 22:3

Discussion

2846.	A car travels at 54 km/hr for first 20 secs , 36 km/hr for next 30 secs and finally 18 km/hr for next 10 secs. Find its average speed.
Answer» A car travels at 54 km/hr for first 20 secs , 36 km/hr for next 30 secs and finally 18 km/hr for next 10 secs. Find its average speed.

Discussion

2847.	Robbers in a car travelling at 20m/s pass a policeman on a motorcycle at rest. The policeman immediately starts chasing the robbers. The policeman accelerates at 3m/s² for 12s and thereafter travels at constant velocity. Calculate the distance covered by the policeman before he overtakes the car.
Answer» Robbers in a car travelling at 20m/s pass a policeman on a motorcycle at rest. The policeman immediately starts chasing the robbers. The policeman accelerates at 3m/s² for 12s and thereafter travels at constant velocity. Calculate the distance covered by the policeman before he overtakes the car.

Discussion

2848.	A thin square plate of side 4 m is placed horizontally 2 m below the surface of water. Calculate the thrust on one of the surface of the plate.(Given: Atmospheric pressure,Patm=1.013×105N/m2Density of water, ρw = 1000 kg/m3,Acceleration due to gravity, (g)=9.8 ms−1)
Answer» A thin square plate of side $4 m$ is placed horizontally $2 m$ below the surface of water. Calculate the thrust on one of the surface of the plate. (Given: Atmospheric pressure, $P_{a t m} = 1.013 \times 10^{5} N / m^{2}$ Density of water, $ρ_{w}$ = $1000 k g / m^{3}$ , Acceleration due to gravity, $(g) = 9.8 m s^{- 1}$ )

Discussion

2849.	If the amount of work done to transfer 30 coulombs of charge is 300 J, then the potential difference between two ends of battery is________.
Answer» If the amount of work done to transfer 30 coulombs of charge is 300 J, then the potential difference between two ends of battery is________.

Discussion

2850.	Why there is no definite relation between instantaneous acceleration and instantaneous velocity since in earlier lectures we got to know that instantaneous velocity and velocity both are equal?
Answer» Why there is no definite relation between instantaneous acceleration and instantaneous velocity since in earlier lectures we got to know that instantaneous velocity and velocity both are equal?

Discussion

Explore topic-wise InterviewSolutions in .

State three characteristics of the medium required for propagation of sound?

The green house gas is: (a) oxygen (b) nitrogen (c) chlorine (d) carbon dioxide.

Explain the factors affecting the value of ‘g’

A girl moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the girl at the end of 2 minutes 20 seconds?

Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one body is 36 g and its density is 9 g/cc. If the mass of the other is 48 g, its density in g/cc is 1. 4/3 2. 3/2 3. 3 4. 5

Question 10Paheli had heard that rain water is as good as distilled water. So, she collected some rain water in a clean glass tumbler and tested it using a tester. To her surprise, she found that the compass needle showed deflection. What could be the reasons?

A runner completes one round of a circular track of diameter 400 m in 40 s. What will be the distance covered and the displacement respectively at the end of 2 minutes 20 s?

What is the distance between stars expressed in light years? What do you understand nby the statement that a star is eight years away from the earth

An ideal transformer has 50 turns in its primary winding and 25 turns in its secondary winding. If the current in the secondary winding is 4 A, then the value of current (in A) in the primary winding if a 200 V AC is applied across it is :(Integer only)

A bullet train starts from rest, and acquires a speed of 25 ms−1 in 20 s. Assuming uniform acceleration calculate the distance covered by the train in 20 s.

Relate the image distance (v), object distance (u) , image height (h′) and object height (h) to the formula of magnification (M) for a mirror.

How much solar energy will be received by 1 square metre area on earth's atmosphere in one hour if the Solar constant were 1.4 Kilowatt per square metre? (assume the rays are falling perpendicular to the Earth's atmosphere)

An iron ball of mass 100 gm moving at a speed of 10 m/sec strikes a wall at angle of 30 degree and reflects at the same angle . If ball and wall remain in contact for 0.1sec, the force exerted on the wall will be how much

work done in extending a spring by Io is wo. work done in further extension Io is

37.In uniform circular motion 1.magnitude of centripetal force remains constant 2.magnitude and direction of centripetal force remains constant . Which is true (with expanation).

2.A ball is thrown vertically upward from a tower with velocity 10 m/sec.Another ball is thrown vertically downward with same speed.The balls reach the bottom of the tower having ratio of velocity_

Question 14If any explosion takes place at the bottom of a lake, what type of shock waves in water will take place?

On the Celsius scale the absolute zero temperature is at:

What is variable velocity?

Two friends on roller skates are standing 5 m apart from each other . One of them throws a ball of 2 kg towards the other , who catches it, How will this activity affect the position of the two ? Explain your answer .

Bus X travels a distance of 360 km in 5 hours whereas bus Y travels a distance of 476 km in 7 hours. Which bus travels faster?

9.How the spark coming out of a grinding stone and mud from wheels of a moving vehicle represent inertia of direction

26.The deflection magnetometer is most sensitive when the deflection theta is -(1) nearly 0 degree (2) nearly 30 degree (3) nearly 45 degree (4) nearly 90 degree

13.If the Eºcell for a given reaction has a negative value, which of the following gives the correct relationships for the values of G^° and Keq?

What is the work done in moving a charge of 0.4 C across two points having a potential difference of 8 V?

Question 1What is meant by power of accommodation of the eye?

What type of frequencies do bats use for echolocation?

What is θ in W=F×s×cos θ

38. What is angular velocity

A plastic disc of diameter 22 cm and thickness 34 cm has a mass of 125 g. For the disc to float on a liquid, which of the following cannot be the value of density of the liquid?

at the first minimum adjacent to the central maximum of a single silt diffraction pattern the phase difference between the hygens wavelet from the edge of the silt and the wavelet from the midpoint of the silt is

Question 2You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?

A cube of side ‘a’ and mass ‘m’ is lying on a rough horizontal floor. A force F is applied at the top. The maximum force that must be applied on cube so that it does not topple about A (consider it does not slip)

A train of 150 m length is going towards North at a speed of 36 km/h. A bird is flying at 18 km/h parallel to track towards South. Find the time taken by the bird to cross the train.

Starting from rest, Deepak paddles his bicycle to attain a velocity of 6 m/s in 30 seconds then he applies brakes so that the velocity of the bicycle comes down to 4 m/s in the next 5 seconds. Calculate the acceleration of the bicycle in both the cases. [2 MARKS]

As shown in the figure, a particle of mass 10 kg is placed at a point A. When the particle is slightly displaced to its right, it starts moving and reaches the point B. The speed of the particle at B is x m/s. (Take g=10 m/s2) The value of x to the nearest integer is .

4.Under the concept of buoyancy a block of wood of density 800 kg/m3 is supporting a 50 kg stone just above water. For such critical flotation the minimum volume of wooden block required is

e²/4π€=[F*d²] how??

A body weighs 49 N on a spring balance at the North Pole. What will be its weight recorded on the same weighing machine, if it is shifted to the equator? [Use, g=GMR2=9.8 m/s2 and radius of earth, R=6400 km]

Centre of gravity of a triangle is _________.

List the various problems faced by a kid having problems with walking.

26.A body covers 10m in 4th s and 15m in 6th s of its uniformly accelerated motion. How far will it travel in the next 3 seconds

12. A small point charge is hanged by an insulatingthread between two fixed and charged parallelplates as shown in figure. The net force on pointcharge is(1) Towards plate A(3) Zero(2) Towards plate B(Ay Upward2019 4-28 22:3

A car travels at 54 km/hr for first 20 secs , 36 km/hr for next 30 secs and finally 18 km/hr for next 10 secs. Find its average speed.

Robbers in a car travelling at 20m/s pass a policeman on a motorcycle at rest. The policeman immediately starts chasing the robbers. The policeman accelerates at 3m/s² for 12s and thereafter travels at constant velocity. Calculate the distance covered by the policeman before he overtakes the car.

A thin square plate of side 4 m is placed horizontally 2 m below the surface of water. Calculate the thrust on one of the surface of the plate.(Given: Atmospheric pressure,Patm=1.013×105N/m2Density of water, ρw = 1000 kg/m3,Acceleration due to gravity, (g)=9.8 ms−1)

If the amount of work done to transfer 30 coulombs of charge is 300 J, then the potential difference between two ends of battery is________.

Why there is no definite relation between instantaneous acceleration and instantaneous velocity since in earlier lectures we got to know that instantaneous velocity and velocity both are equal?