16569 + Interview Questions in Physics

1.	In figure (i), a lens of focal length 10 cm is shown. It is cut into two parts and placed as shown in figure (ii).An object AB of height 1 cm is placed at a distance of 7.5 cm from combination in figure (ii). The height of the image will be (in cm)
Answer» In figure (i), a lens of focal length $10 cm$ is shown. It is cut into two parts and placed as shown in figure (ii). An object AB of height $1 cm$ is placed at a distance of $7.5 cm$ from combination in figure (ii). The height of the image will be (in cm)

Discussion

2.	Magnetic Hysteresis curve is the graph between which to quantities, intensity of magnetisation vs magnetic intensity or magnetic field vs magnetic intenstity
Answer» Magnetic Hysteresis curve is the graph between which to quantities, intensity of magnetisation vs magnetic intensity or magnetic field vs magnetic intenstity

Discussion

3.	How does the resistance of conductor depend on: (a) length of the contuctor? (b) area of cross -section of hte conductor? (c) temperature of the conductor
Answer» How does the resistance of conductor depend on: (a) length of the contuctor? (b) area of cross -section of hte conductor? (c) temperature of the conductor

Discussion

4.	What are Radio waves and how do they work?
Answer» What are Radio waves and how do they work?

Discussion

5.	64.A 5 wire potentiometer (with each wire of 1m)is connected to a storage cellof emf 2v and resistance 1ohm.A primary cell is balanced against middel of the second last wire.What resistancewill be required in series with the storage cell to push the null point to the center of the last wire? The wire has 3 ohm resistance
Answer» 64.A 5 wire potentiometer (with each wire of 1m)is connected to a storage cellof emf 2v and resistance 1ohm.A primary cell is balanced against middel of the second last wire.What resistancewill be required in series with the storage cell to push the null point to the center of the last wire? The wire has 3 ohm resistance

Discussion

6.	Good fuel is one which has a
Answer» Good fuel is one which has a

Discussion

7.	In oscillating LC circuit the total energy is U and maximum charge upon capacitor is Q. when the charge uon the capacitor is Q/2 , then energy stored in inductor ?
Answer» In oscillating LC circuit the total energy is U and maximum charge upon capacitor is Q. when the charge uon the capacitor is Q/2 , then energy stored in inductor ?

Discussion

8.	The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
Answer» The frequency of a source of sound is $100 H z$ . How many times does it vibrate in a minute?

Discussion

9.	Which is the country having the largest number of hydroelectric dams?
Answer» Which is the country having the largest number of hydroelectric dams?

Discussion

10.	In a closed container of constant volume, the pressure of water exhibits an interesting dependence on temperature - The point D (273.16 K,0.006 atm) is called the triple point, Tp, of water, where all there phases coexist. What is the observed phase change when the temperature is increased from -100C to +100C, while maintaining a constant pressure of 0.006 atm?
Answer» In a closed container of constant volume, the pressure of water exhibits an interesting dependence on temperature - The point D (273.16 K,0.006 atm) is called the triple point, Tp, of water, where all there phases coexist. What is the observed phase change when the temperature is increased from -10⁰C to +10⁰C, while maintaining a constant pressure of 0.006 atm?

10.

In a closed container of constant volume, the pressure of water exhibits an interesting dependence on temperature - The point D (273.16 K,0.006 atm) is called the triple point, Tp, of water, where all there phases coexist. What is the observed phase change when the temperature is increased from -100C to +100C, while maintaining a constant pressure of 0.006 atm?

Answer»

In a closed container of constant volume, the pressure of water exhibits an interesting dependence on temperature -

The point D (273.16 K,0.006 atm) is called the triple point, Tp, of water, where all there phases coexist. What is the observed phase change when the temperature is increased from -10⁰C to +10⁰C, while maintaining a constant pressure of 0.006 atm?

Discussion

11.	In the given figure what kind of instrument is played by the man at an indian music concert? On what factor does the frequency of the sound depends?
Answer» In the given figure what kind of instrument is played by the man at an indian music concert? On what factor does the frequency of the sound depends?

11.

In the given figure what kind of instrument is played by the man at an indian music concert? On what factor does the frequency of the sound depends?

Answer»

In the given figure what kind of instrument is played by the man at an indian music concert?

On what factor does the frequency of the sound depends?

Discussion

12.	Find V(be) if base current is 40 micro A.
Answer» Find V(be) if base current is 40 micro A.

Discussion

13.	The refractive index of diamond with respect to air is 2.42. What will be the refractive index of air with respect to diamond ?
Answer» The refractive index of diamond with respect to air is $2.42$ . What will be the refractive index of air with respect to diamond ?

Discussion

14.	The coercivity of a bar magnet is 100A/m. It isto be demagnetised by placing it inside a solenoidof length 100 cm and number of turns 50. Thecurrent flowing the solenoid will be(1) 4A (2) 2A (3) 1A (4) zero
Answer» The coercivity of a bar magnet is 100A/m. It isto be demagnetised by placing it inside a solenoidof length 100 cm and number of turns 50. Thecurrent flowing the solenoid will be(1) 4A (2) 2A (3) 1A (4) zero

Discussion

15.	In reflection, angle i=angle r, therefore when a ray strikes surface normally angle i=0 and angle r=0. But there is no such rule in refraction(i=r). So,why, when a ray strikes the surface of separation of 2 media normally,it suffers no refraction?
Answer» In reflection, angle i=angle r, therefore when a ray strikes surface normally angle i=0 and angle r=0. But there is no such rule in refraction(i=r). So,why, when a ray strikes the surface of separation of 2 media normally,it suffers no refraction?

Discussion

16.	What is an electric switch? [1 MARK]
Answer» What is an electric switch? [1 MARK]

Discussion

17.	53. During a process a system absorbs 710 J of heat and does work? The change in internal energy for the process is 460 J. What is the work done by the system?
Answer» 53. During a process a system absorbs 710 J of heat and does work? The change in internal energy for the process is 460 J. What is the work done by the system?

Discussion

18.	9.WHAT IS DIFFERENCE BETWEEN CIRCULAR AND ROTATIONAL MOTION.
Answer» 9.WHAT IS DIFFERENCE BETWEEN CIRCULAR AND ROTATIONAL MOTION.

Discussion

19.	Electric field lines are always normal to the surface, verify.
Answer» Electric field lines are always normal to the surface, verify.

Discussion

20.	A light ray passes through three different mediums as shown in the ray diagram.If i1<i3, then choose the correct option.
Answer» A light ray passes through three different mediums as shown in the ray diagram. If $i_{1} < i_{3}$ , then choose the correct option.

Discussion

21.	Figure shows the variation of electric field inten sit 5) What is the potential differenc 2 m an between the points at x from O? (N/C) x-10 5 (1) 30 V (3) 40 V 4 6 x(m) (2) 60 V (4) 80 V
Answer» Figure shows the variation of electric field inten sit 5) What is the potential differenc 2 m an between the points at x from O? (N/C) x-10 5 (1) 30 V (3) 40 V 4 6 x(m) (2) 60 V (4) 80 V

Discussion

22.	How is dispersed white light recomposed? Draw a neat labelled diagram to explain. [5 MARKS]
Answer» How is dispersed white light recomposed? Draw a neat labelled diagram to explain. [5 MARKS]

Discussion

23.	A wooden stick of length 3l is rotated about an end with constant angular velocity ω in a uniform magnetic field B perpendicular to the plane of motion. If the upper one third of its length is coated with copper, the potential difference across the whole length of the stick is
Answer» A wooden stick of length $3 l$ is rotated about an end with constant angular velocity $ω$ in a uniform magnetic field B perpendicular to the plane of motion. If the upper one third of its length is coated with copper, the potential difference across the whole length of the stick is

Discussion

24.	In a year, the sun generates more than____times the energy that humans currently consume.
Answer» In a year, the sun generates more than____times the energy that humans currently consume.

Discussion

25.	a particle projected from ground passes 2 points which are 10m apart which are of height 12m and 18m above ground. Find minimum speed of projection
Answer» a particle projected from ground passes 2 points which are 10m apart which are of height 12m and 18m above ground. Find minimum speed of projection

Discussion

26.	When an ideal conductor connects two points, the potential difference between these two points becomes ___.
Answer» When an ideal conductor connects two points, the potential difference between these two points becomes ___.

Discussion

27.	Question 11 A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively (Figure). Which of the following is true? (a) R1 = R2 = R3 (b) R1 > R2 > R3 (c) R3 > R2 > R1 (d) R2 > R3 > R1
Answer» Question 11 A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively (Figure). Which of the following is true? (a) R1 = R2 = R3 (b) R1 > R2 > R3 (c) R3 > R2 > R1 (d) R2 > R3 > R1

Discussion

28.	A vessel of depth x is half filled with oil of refractive index μ2. and half with water of refractive index μ1. The apparent depth of the vessel when viewed from above is :
Answer» A vessel of depth x is half filled with oil of refractive index $μ_{2} .$ and half with water of refractive index $μ_{1} .$ The apparent depth of the vessel when viewed from above is :

Discussion

29.	The time period of a satellite orbiting the earth is 3 h.If the sepration between satellite and centre of the earth is increased to 4 times the previous value,then the new time period will become _ _ _
Answer» The time period of a satellite orbiting the earth is 3 h.If the sepration between satellite and centre of the earth is increased to 4 times the previous value,then the new time period will become _ _ _

Discussion

30.	Four resistances are connected as shown below. A potential difference is applied between points P and S. (a) Calculate the equivalent resistance between points Q and R. (b) What is the equivalent resistance between points P and S ? (c) If the current flowing through 3Ω resistance is 2 A, what is the current through 2Ω resistance? (d) What is the current through the 4Ω resistance?
Answer» Four resistances are connected as shown below. A potential difference is applied between points P and S. (a) Calculate the equivalent resistance between points Q and R. (b) What is the equivalent resistance between points P and S ? (c) If the current flowing through $3 Ω$ resistance is 2 A, what is the current through $2 Ω$ resistance? (d) What is the current through the $4 Ω$ resistance?

Discussion

31.	In the diagram below the red arrows represent
Answer» In the diagram below the red arrows represent

31.

In the diagram below the red arrows represent

Answer»

In the diagram below the red arrows represent

Discussion

32.	How is the passage of electricity through an electrolyte different from the passage of electricity through a copper wire?
Answer» How is the passage of electricity through an electrolyte different from the passage of electricity through a copper wire?

Discussion

33.	Two wires, copper and bronze,of certain dimensions are kept in a room, the temeperature is regulated in such a way that a constant value is maintained throughout. A naughty boy 'chintu' came and starated playing wih the dimensions of different wires, which of the following statement is correct? (Assuming room's temperature is equal to wire's temperature)
Answer» Two wires, copper and bronze,of certain dimensions are kept in a room, the temeperature is regulated in such a way that a constant value is maintained throughout. A naughty boy 'chintu' came and starated playing wih the dimensions of different wires, which of the following statement is correct? (Assuming room's temperature is equal to wire's temperature)

Discussion

34.	Among the following electrolytes, which is the most effective coagulating agent for Sb2S3 solution?
Answer» Among the following electrolytes, which is the most effective coagulating agent for $S b_{2} S_{3}$ solution?

34.

Among the following electrolytes, which is the most effective coagulating agent for Sb2S3 solution?

Answer»

Among the following electrolytes, which is the most effective coagulating agent for $S b_{2} S_{3}$ solution?

Discussion

35.	The unit of potential difference is : (a) ampere (b) volt (c) ohm (d) coulomb.
Answer» The unit of potential difference is : (a) ampere (b) volt (c) ohm (d) coulomb.

35.

The unit of potential difference is : (a) ampere (b) volt (c) ohm (d) coulomb.

Answer»

The unit of potential difference is :

(a) ampere (b) volt

(c) ohm (d) coulomb.

Discussion

36.	Why we generate electricity at 11000 volt ?
Answer» Why we generate electricity at 11000 volt ?

Discussion

37.	Dimensional formula of resistance
Answer» Dimensional formula of resistance

Discussion

38.	Why induction does not takes place in particles?
Answer» Why induction does not takes place in particles?

Discussion

39.	Question 33 Prepare a list of five activities that you perform daily in which natural resources can be conserved or energy utilization can be minimized.
Answer» Question 33 Prepare a list of five activities that you perform daily in which natural resources can be conserved or energy utilization can be minimized.

Discussion

40.	A tightly wound, long solenoid is kept with its axis parallel to a large metal sheet carrying a surface current. The surface current through a width dl of the sheet is Kdl and the number of turns per unit length of the solenoid is n. The magnetic field near the centre of the solenoid is found to be zero. Find the current in the solenoid.
Answer» A tightly wound, long solenoid is kept with its axis parallel to a large metal sheet carrying a surface current. The surface current through a width $d l$ of the sheet is $K d l$ and the number of turns per unit length of the solenoid is $n$ . The magnetic field near the centre of the solenoid is found to be zero. Find the current in the solenoid.

Discussion

41.	What is the general convention for a clockwise and anti-clockwise moment?
Answer» What is the general convention for a clockwise and anti-clockwise moment?

Discussion

42.	7.When light of wavelength 5000 A^° in vacuum travels through same thickness in glass and water, the difference in the number of waves is 400. Find thickness (Refractive indices of glass and water are 3/2 and 4/3 respectively )
Answer» 7.When light of wavelength 5000 A^° in vacuum travels through same thickness in glass and water, the difference in the number of waves is 400. Find thickness (Refractive indices of glass and water are 3/2 and 4/3 respectively )

Discussion

43.	Energy levels A,B and C of a certain atom, correspond to increasing value of energy, i.e, EA<EB<EC. If λ1,λ2 and λ3 are the wavelengths of radiations corresponding to transitions C→B, B→A and C→A respectively, which one of the following relations is correct?
Answer» Energy levels $A, B$ and $C$ of a certain atom, correspond to increasing value of energy, i.e, $E_{A} < E_{B} < E_{C}$ . If $λ_{1}, λ_{2} and λ_{3}$ are the wavelengths of radiations corresponding to transitions $C \to B$ , $B \to A$ and $C \to A$ respectively, which one of the following relations is correct?

Discussion

44.	A split lens has its two parts separated by distance a and its focal length is f. An object is placed at a distance 3f2 on the axis of the undivided lens as shown. The distance between the images formed is
Answer» A split lens has its two parts separated by distance $a$ and its focal length is $f$ . An object is placed at a distance $\frac{3 f}{2}$ on the axis of the undivided lens as shown. The distance between the images formed is

Discussion

45.	Solve the following examplesa. An object of height 7 cm is kept at a distance of 25 cm in front of a concave mirror. The focal length of the mirror is 15 cm. At what distance from the mirror should a screen be kept so as to get a clear image? What will be the size and nature of the image? b. A convex mirror has a focal length of 18 cm. The image of an object kept in front of the mirror is half the height of the object. What is the distance of the object from the mirror? c. A 10 cm long stick is kept in front of a concave mirror having focal length of 10 cm in such a way that the end of the stick closest to the pole is at a distance of 20 cm. What will be the length of the image?
Answer» Solve the following examples a. An object of height 7 cm is kept at a distance of 25 cm in front of a concave mirror. The focal length of the mirror is 15 cm. At what distance from the mirror should a screen be kept so as to get a clear image? What will be the size and nature of the image? b. A convex mirror has a focal length of 18 cm. The image of an object kept in front of the mirror is half the height of the object. What is the distance of the object from the mirror? c. A 10 cm long stick is kept in front of a concave mirror having focal length of 10 cm in such a way that the end of the stick closest to the pole is at a distance of 20 cm. What will be the length of the image?

Discussion

46.	Draw the circuit diagram of an electric circuit containing a battery of 6 V, a key, an ammeter, a resistor of 4 Ω in series with a combination of two resistors of 8 Ω each in parallel, and a voltmeter across the parallel combination.(a) Calculate the resistance of the circuit.(b) Find the current flowing in the circuit.(c) What will be the voltage across the parallel combination of resistors?
Answer» Draw the circuit diagram of an electric circuit containing a battery of 6 V, a key, an ammeter, a resistor of 4 Ω in series with a combination of two resistors of 8 Ω each in parallel, and a voltmeter across the parallel combination. (a) Calculate the resistance of the circuit. (b) Find the current flowing in the circuit. (c) What will be the voltage across the parallel combination of resistors?

Discussion

47.	Three charges are placed as shown in figure. If the electric potential energy of the system is zero, then Q:q is :
Answer» Three charges are placed as shown in figure. If the electric potential energy of the system is zero, then $Q : q$ is :

Discussion

48.	17. The energy required to melt 1g of ice is 33J The number of quanta of radiation of frequency 4.67×10 power 13 sec that must be absorbed to melt 10g of ice is
Answer» 17. The energy required to melt 1g of ice is 33J The number of quanta of radiation of frequency 4.67×10 power 13 sec that must be absorbed to melt 10g of ice is

Discussion

49.	Question 13 In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because (a) its temperature increases (b) larger amount of potential energy is converted into kinetic energy (c) the electricity content of water increases with height (d) more water molecules dissociate into ions
Answer» Question 13 In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because (a) its temperature increases (b) larger amount of potential energy is converted into kinetic energy (c) the electricity content of water increases with height (d) more water molecules dissociate into ions

Discussion

50.	the height at which weight of a person changes by 1% is(R is the radius of earth)
Answer» the height at which weight of a person changes by 1% is(R is the radius of earth)

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In figure (i), a lens of focal length 10 cm is shown. It is cut into two parts and placed as shown in figure (ii).An object AB of height 1 cm is placed at a distance of 7.5 cm from combination in figure (ii). The height of the image will be (in cm)

Magnetic Hysteresis curve is the graph between which to quantities, intensity of magnetisation vs magnetic intensity or magnetic field vs magnetic intenstity

How does the resistance of conductor depend on: (a) length of the contuctor? (b) area of cross -section of hte conductor? (c) temperature of the conductor

What are Radio waves and how do they work?

Good fuel is one which has a

In oscillating LC circuit the total energy is U and maximum charge upon capacitor is Q. when the charge uon the capacitor is Q/2 , then energy stored in inductor ?

The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

Which is the country having the largest number of hydroelectric dams?

In the given figure what kind of instrument is played by the man at an indian music concert? On what factor does the frequency of the sound depends?

Find V(be) if base current is 40 micro A.

The refractive index of diamond with respect to air is 2.42. What will be the refractive index of air with respect to diamond ?

The coercivity of a bar magnet is 100A/m. It isto be demagnetised by placing it inside a solenoidof length 100 cm and number of turns 50. Thecurrent flowing the solenoid will be(1) 4A (2) 2A (3) 1A (4) zero

In reflection, angle i=angle r, therefore when a ray strikes surface normally angle i=0 and angle r=0. But there is no such rule in refraction(i=r). So,why, when a ray strikes the surface of separation of 2 media normally,it suffers no refraction?

What is an electric switch? [1 MARK]

53. During a process a system absorbs 710 J of heat and does work? The change in internal energy for the process is 460 J. What is the work done by the system?

9.WHAT IS DIFFERENCE BETWEEN CIRCULAR AND ROTATIONAL MOTION.

Electric field lines are always normal to the surface, verify.

A light ray passes through three different mediums as shown in the ray diagram.If i1&lt;i3, then choose the correct option.

Figure shows the variation of electric field inten sit 5) What is the potential differenc 2 m an between the points at x from O? (N/C) x-10 5 (1) 30 V (3) 40 V 4 6 x(m) (2) 60 V (4) 80 V

How is dispersed white light recomposed? Draw a neat labelled diagram to explain. [5 MARKS]

A wooden stick of length 3l is rotated about an end with constant angular velocity ω in a uniform magnetic field B perpendicular to the plane of motion. If the upper one third of its length is coated with copper, the potential difference across the whole length of the stick is

In a year, the sun generates more than____times the energy that humans currently consume.

a particle projected from ground passes 2 points which are 10m apart which are of height 12m and 18m above ground. Find minimum speed of projection

When an ideal conductor connects two points, the potential difference between these two points becomes ___.

Question 11 A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively (Figure). Which of the following is true? (a) R1 = R2 = R3 (b) R1 &gt; R2 &gt; R3 (c) R3 &gt; R2 &gt; R1 (d) R2 &gt; R3 &gt; R1

A vessel of depth x is half filled with oil of refractive index μ2. and half with water of refractive index μ1. The apparent depth of the vessel when viewed from above is :

The time period of a satellite orbiting the earth is 3 h.If the sepration between satellite and centre of the earth is increased to 4 times the previous value,then the new time period will become _ _ _

In the diagram below the red arrows represent

How is the passage of electricity through an electrolyte different from the passage of electricity through a copper wire?

Among the following electrolytes, which is the most effective coagulating agent for Sb2S3 solution?

The unit of potential difference is : (a) ampere (b) volt (c) ohm (d) coulomb.

Why we generate electricity at 11000 volt ?

Dimensional formula of resistance

Why induction does not takes place in particles?

Question 33 Prepare a list of five activities that you perform daily in which natural resources can be conserved or energy utilization can be minimized.

What is the general convention for a clockwise and anti-clockwise moment?

7.When light of wavelength 5000 A^° in vacuum travels through same thickness in glass and water, the difference in the number of waves is 400. Find thickness (Refractive indices of glass and water are 3/2 and 4/3 respectively )

Energy levels A,B and C of a certain atom, correspond to increasing value of energy, i.e, EA&lt;EB&lt;EC. If λ1,λ2 and λ3 are the wavelengths of radiations corresponding to transitions C→B, B→A and C→A respectively, which one of the following relations is correct?

A split lens has its two parts separated by distance a and its focal length is f. An object is placed at a distance 3f2 on the axis of the undivided lens as shown. The distance between the images formed is

Three charges are placed as shown in figure. If the electric potential energy of the system is zero, then Q:q is :

17. The energy required to melt 1g of ice is 33J The number of quanta of radiation of frequency 4.67×10 power 13 sec that must be absorbed to melt 10g of ice is

the height at which weight of a person changes by 1% is(R is the radius of earth)

A light ray passes through three different mediums as shown in the ray diagram.If i1<i3, then choose the correct option.

Question 11 A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively (Figure). Which of the following is true? (a) R1 = R2 = R3 (b) R1 > R2 > R3 (c) R3 > R2 > R1 (d) R2 > R3 > R1

Energy levels A,B and C of a certain atom, correspond to increasing value of energy, i.e, EA<EB<EC. If λ1,λ2 and λ3 are the wavelengths of radiations corresponding to transitions C→B, B→A and C→A respectively, which one of the following relations is correct?