16569 + Interview Questions in Physics

1.	Explain with a suitable diagram, how a concave mirror converges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.
Answer» Explain with a suitable diagram, how a concave mirror converges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.

Discussion

2.	Calculate the wavelength of a wave of frequency 900MHz.
Answer» Calculate the wavelength of a wave of frequency 900MHz.

Discussion

3.	An object is placed at 60 m in front of a concave mirror. If its radius of curvature is 40 m, find the position of image.
Answer» An object is placed at 60 m in front of a concave mirror. If its radius of curvature is 40 m, find the position of image.

Discussion

4.	With respect to non-contact forces, which of the following statements are correct?
Answer» With respect to non-contact forces, which of the following statements are correct?

Discussion

5.	Propagation of sound waves follow the laws of reflection.
Answer» Propagation of sound waves follow the laws of reflection.

Discussion

6.	A ring of radius R, made of an insulating material carries a charge Q uniformly distributed on it. If the ring rotates about the axis passing through its centre and normal to plane of the ring with constant angular speed ω, then the magnitude of the magnetic moment of the ring will be?
Answer» A ring of radius R, made of an insulating material carries a charge Q uniformly distributed on it. If the ring rotates about the axis passing through its centre and normal to plane of the ring with constant angular speed $ω$ , then the magnitude of the magnetic moment of the ring will be?

Discussion

7.	Most of the energy we use originally comes from
Answer» Most of the energy we use originally comes from

Discussion

8.	A mixture of radioactive substances gives off three types of radiations. (a) Name these three types of radiations. (b) Name the type of radiation consisting of the same kind of particles as cathode rays. (c) One of these radiations is similar to X-rays. Name the radiation. (d) When the particle referred to in (c) becomes neutral, it is found to be the atom of a rare gas. Name this rare gas. [5 MARKS]
Answer» A mixture of radioactive substances gives off three types of radiations. (a) Name these three types of radiations. (b) Name the type of radiation consisting of the same kind of particles as cathode rays. (c) One of these radiations is similar to X-rays. Name the radiation. (d) When the particle referred to in (c) becomes neutral, it is found to be the atom of a rare gas. Name this rare gas. [5 MARKS]

Discussion

9.	An object in a denser medium, when viewed from a rarer medium, appears to be raised. The shift is maximum for: (a) red light (b) violet light (c) yellow light (d) green light
Answer» An object in a denser medium, when viewed from a rarer medium, appears to be raised. The shift is maximum for: (a) red light (b) violet light (c) yellow light (d) green light

9.

An object in a denser medium, when viewed from a rarer medium, appears to be raised. The shift is maximum for: (a) red light (b) violet light (c) yellow light (d) green light

Answer»

An object in a denser medium, when viewed from a rarer medium, appears to be raised. The shift is maximum for:

(a) red light (b) violet light

(c) yellow light (d) green light

Discussion

10.	What is nichrome ? State its one use.
Answer» What is nichrome ? State its one use.

Discussion

11.	A boy while playing under a mango tree saw a mango falling near him. This is due to the force of:
Answer» A boy while playing under a mango tree saw a mango falling near him. This is due to the force of:

Discussion

12.	What is potential difference ? What is voltage?
Answer» What is potential difference ? What is voltage?

Discussion

13.	All formulas from the 'Light' chapter.
Answer» All formulas from the 'Light' chapter.

Discussion

14.	Define the term angle of deviation.
Answer» Define the term angle of deviation.

Discussion

15.	In Fleming’s right hand rule
Answer» In Fleming’s right hand rule

Discussion

16.	Why are metals good conductor of electricity and non metals are not?
Answer» Why are metals good conductor of electricity and non metals are not?

Discussion

17.	The mirror used by a dentist to examine the teeth of a person is : (a) convex (b) concave (c) plane (d) any one of the above
Answer» The mirror used by a dentist to examine the teeth of a person is : (a) convex (b) concave (c) plane (d) any one of the above

Discussion

18.	A ship sends out ultrasound that returns from the seabed and is detected after 5 s. If the speed of ultrasound through seawater is 1600 m/s, what is the distance of the seabed from the ship?
Answer» A ship sends out ultrasound that returns from the seabed and is detected after $5 s$ . If the speed of ultrasound through seawater is $1600 m / s$ , what is the distance of the seabed from the ship?

Discussion

19.	The critical angle for a light ray travelling from denser to rarer medium is defined as the angle of incidence at which the light refracts at 90∘ (angle of refraction). If a ray of light travels from water (μw) to air (μa). Find the critical angle?
Answer» The critical angle for a light ray travelling from denser to rarer medium is defined as the angle of incidence at which the light refracts at $90^{\circ}$ (angle of refraction). If a ray of light travels from water (μ_w) to air (μ_a). Find the critical angle?

19.

The critical angle for a light ray travelling from denser to rarer medium is defined as the angle of incidence at which the light refracts at 90∘ (angle of refraction). If a ray of light travels from water (μw) to air (μa). Find the critical angle?

Answer»

The critical angle for a light ray travelling from denser to rarer medium is defined as the angle of incidence at which the light refracts at $90^{\circ}$ (angle of refraction).

If a ray of light travels from water (μ_w) to air (μ_a).

Find the critical angle?

Discussion

20.	Question 12 If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be (a) 100% (b) 200% (c) 300% (d) 400%
Answer» Question 12 If the current I through a resistor is increased by $100 %$ (assume that temperature remains unchanged), the increase in power dissipated will be (a) $100 %$ (b) $200 %$ (c) $300 %$ (d) $400 %$

Discussion

21.	For earthing an electric appliance, one has to remove the paint from the metallic body of the appliance where the electric contact is made. Explain the reason.
Answer» For earthing an electric appliance, one has to remove the paint from the metallic body of the appliance where the electric contact is made. Explain the reason.

21.

For earthing an electric appliance, one has to remove the paint from the metallic body of the appliance where the electric contact is made. Explain the reason.

Answer»

For earthing an electric appliance, one has to remove the paint from the metallic body of the appliance where the electric contact is made. Explain the reason.

Discussion

22.	why do we use an aqueous solution of sodium chloride for electrolysis instead of molten sodium chloride?
Answer» why do we use an aqueous solution of sodium chloride for electrolysis instead of molten sodium chloride?

Discussion

23.	Should fuse have low resistance or high.Give reason
Answer» Should fuse have low resistance or high.Give reason

Discussion

24.	In a prism, is angle of incidence always equal to angle of emergence?
Answer» In a prism, is angle of incidence always equal to angle of emergence?

Discussion

25.	If the incident ray makes the same angle with normal of two interfaces,air-water interface & air-diamond interface, in which medium value of 'angle of refralow?' is low ?
Answer» If the incident ray makes the same angle with normal of two interfaces,air-water interface & air-diamond interface, in which medium value of 'angle of refralow?' is low ?

Discussion

26.	Ministry of Drinking Water and Sanitation is nodal Ministry in implementation of which of the following Programmes: Which of the above statements is/are correct?
Answer» Ministry of Drinking Water and Sanitation is nodal Ministry in implementation of which of the following Programmes: Which of the above statements is/are correct?

26.

Ministry of Drinking Water and Sanitation is nodal Ministry in implementation of which of the following Programmes: Which of the above statements is/are correct?

Answer»

Ministry of Drinking Water and Sanitation is nodal Ministry in implementation of which of the following Programmes:

Which of the above statements is/are correct?

Discussion

27.	If an object is at a considerable distance (or infinity) in front of a convex lens, where is the image formed ?
Answer» If an object is at a considerable distance (or infinity) in front of a convex lens, where is the image formed ?

Discussion

28.	Skin cancer is caused by___.
Answer» Skin cancer is caused by___.

Discussion

29.	Where would the image be formed by a convex mirror if the object is placed : (a) between infinity and pole of the mirror ? (b) at infinity ? Draw labelled ray-diagrams to show the formation of image in both the cases.
Answer» Where would the image be formed by a convex mirror if the object is placed : (a) between infinity and pole of the mirror ? (b) at infinity ? Draw labelled ray-diagrams to show the formation of image in both the cases.

Discussion

30.	What is meant by "sustainable development"?
Answer» What is meant by "sustainable development"?

Discussion

31.	A wire of resistance 9 ohm having length 30 cm is tripled on itself. What is its new resistance?
Answer» A wire of resistance 9 ohm having length 30 cm is tripled on itself. What is its new resistance?

Discussion

32.	What is the use of oscillator in cyclotron?
Answer» What is the use of oscillator in cyclotron?

Discussion

33.	In a conductor, 6.25×1016 electrons frow from its end A to B in 2 s. Find the current flowing through the conductor. (e=1.6×10−19 C).
Answer» In a conductor, $6.25 \times 10^{16}$ electrons frow from its end A to B in 2 s. Find the current flowing through the conductor. ( $e = 1.6 \times 10^{- 19} C$ ).

Discussion

34.	Define the term electric potential. State its S.I. Unit.
Answer» Define the term electric potential. State its S.I. Unit.

Discussion

35.	What may be considered " simple applications " of different types of vibrations( including resonance).....(As given in the ICSE syllabus )
Answer» What may be considered " simple applications " of different types of vibrations( including resonance).....(As given in the ICSE syllabus )

Discussion

36.	Where will parallel rays meet/appear to meet ?
Answer» Where will parallel rays meet/appear to meet ?

36.

Where will parallel rays meet/appear to meet ?

Answer»

Where will parallel rays meet/appear to meet ?

Discussion

37.	Two electrodes are maintained at a potential difference of 100V. How much kinetic energy would an electron gain,moving from cathode to anode ?
Answer» Two electrodes are maintained at a potential difference of 100V. How much kinetic energy would an electron gain,moving from cathode to anode ?

Discussion

38.	Will dispersion takes place in our eye when white light pass through our eye?when white light pass from one mediam to another dispersion takes place?so, when white light enters our eye there are two Mediams air and aqueous humour ,so the light would dispersdispers so during noon the sun should appear colourful like rainbow???? Why is not happening??
Answer» Will dispersion takes place in our eye when white light pass through our eye?when white light pass from one mediam to another dispersion takes place?so, when white light enters our eye there are two Mediams air and aqueous humour ,so the light would dispersdispers so during noon the sun should appear colourful like rainbow???? Why is not happening??

Discussion

39.	The focal length of the convex lens is 20 cm and focal length of the concave mirror is 30 cm. And the separation between lens and mirror is 90 cm. If the object is placed 60 cm before the lens, find out the position of the image formed by the concave mirror.
Answer» The focal length of the convex lens is 20 cm and focal length of the concave mirror is 30 cm. And the separation between lens and mirror is 90 cm. If the object is placed 60 cm before the lens, find out the position of the image formed by the concave mirror.

39.

The focal length of the convex lens is 20 cm and focal length of the concave mirror is 30 cm. And the separation between lens and mirror is 90 cm. If the object is placed 60 cm before the lens, find out the position of the image formed by the concave mirror.

Answer»

The focal length of the convex lens is 20 cm and focal length of the concave mirror is 30 cm. And the separation between lens and mirror is 90 cm. If the object is placed 60 cm before the lens, find out the position of the image formed by the concave mirror.

Discussion

40.	A nuclear reaction is involved in generating electrical energy from nuclear energy. Name the reaction.
Answer» A nuclear reaction is involved in generating electrical energy from nuclear energy. Name the reaction.

Discussion

41.	A person can read a book clearly only if he holds it at an arm's length from him. Name the defect of vision : (a) if the person is an old man (b) if the person is a young man
Answer» A person can read a book clearly only if he holds it at an arm's length from him. Name the defect of vision : (a) if the person is an old man (b) if the person is a young man

Discussion

42.	The red colour of the sun at the time of sunrise and sunset is because : (a) red colour is least scattered (b) blue colour is least scattered (c) red colour is most scattered (d) blue colour is most scattered
Answer» The red colour of the sun at the time of sunrise and sunset is because : (a) red colour is least scattered (b) blue colour is least scattered (c) red colour is most scattered (d) blue colour is most scattered

Discussion

43.	What is mean free path?
Answer» What is mean free path?

Discussion

44.	Write an expression for the electrical energy spent in flow of current through an electrical appliance in terms of current, resistance and time.
Answer» Write an expression for the electrical energy spent in flow of current through an electrical appliance in terms of current, resistance and time.

Discussion

45.	2 kg of ice melts when water at 100∘ is poured in a hole drilled in a block of ice. What mass of water was used? Given: Specific heat capacity of water=4200 J kg−1 K−1,specific latent heat of ice=336×103 J kg−1.
Answer» 2 kg of ice melts when water at $100^{\circ}$ is poured in a hole drilled in a block of ice. What mass of water was used? Given: Specific heat capacity of water=4200 J k $g^{- 1} K^{- 1}$ ,specific latent heat of ice= $336 \times 10^{3} J k g^{- 1}$ .

45.

2 kg of ice melts when water at 100∘ is poured in a hole drilled in a block of ice. What mass of water was used? Given: Specific heat capacity of water=4200 J kg−1 K−1,specific latent heat of ice=336×103 J kg−1.

Answer»

2 kg of ice melts when water at $100^{\circ}$ is poured in a hole drilled in a block of ice. What mass of water was used?

Given: Specific heat capacity of water=4200 J k $g^{- 1} K^{- 1}$ ,specific latent heat of ice= $336 \times 10^{3} J k g^{- 1}$ .

Discussion

46.	Name the patriotic song composed by Rabindranath Tagore which was sung by huge crowds parading the streets.
Answer» Name the patriotic song composed by Rabindranath Tagore which was sung by huge crowds parading the streets.

Discussion

47.	A man who cannot see clearly beyond 5 m wants to see stars clearly. He should use a lens of focal length ___ m.
Answer» A man who cannot see clearly beyond 5 m wants to see stars clearly. He should use a lens of focal length ___ m.

Discussion

48.	When a star reaches a certain point in its life, it may explode and become a supernova. When it does this, it gives out energy in the form of waves which travel to the earth through space. Which of these could not be received from the star?
Answer» When a star reaches a certain point in its life, it may explode and become a supernova. When it does this, it gives out energy in the form of waves which travel to the earth through space. Which of these could not be received from the star?

Discussion

49.	A man uses a crowbar of length 1.5m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance of 1m from his hand. (a) Draw a diagram of the arrangement showing the fulcrum (F), load (L) and effort (E) with their directions. (b) State the kind of lever. (c) Calculate (i) load arm, (ii) effort arm, (iii) mechanical advantage, and (iv) the effort needed.
Answer» A man uses a crowbar of length 1.5m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance of 1m from his hand. (a) Draw a diagram of the arrangement showing the fulcrum (F), load (L) and effort (E) with their directions. (b) State the kind of lever. (c) Calculate (i) load arm, (ii) effort arm, (iii) mechanical advantage, and (iv) the effort needed.

Discussion

50.	On burning completely 2.5 kg of a fuel produces 87500 kJ of heat energy. The Calorific value of the fuel is –
Answer» On burning completely 2.5 kg of a fuel produces 87500 kJ of heat energy. The Calorific value of the fuel is –

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Explain with a suitable diagram, how a concave mirror converges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.

Calculate the wavelength of a wave of frequency 900MHz.

An object is placed at 60 m in front of a concave mirror. If its radius of curvature is 40 m, find the position of image.

With respect to non-contact forces, which of the following statements are correct?

Propagation of sound waves follow the laws of reflection.

A ring of radius R, made of an insulating material carries a charge Q uniformly distributed on it. If the ring rotates about the axis passing through its centre and normal to plane of the ring with constant angular speed ω, then the magnitude of the magnetic moment of the ring will be?

Most of the energy we use originally comes from

An object in a denser medium, when viewed from a rarer medium, appears to be raised. The shift is maximum for: (a) red light (b) violet light (c) yellow light (d) green light

What is nichrome ? State its one use.

A boy while playing under a mango tree saw a mango falling near him. This is due to the force of:

What is potential difference ? What is voltage?

All formulas from the 'Light' chapter.

Define the term angle of deviation.

In Fleming’s right hand rule

Why are metals good conductor of electricity and non metals are not?

The mirror used by a dentist to examine the teeth of a person is : (a) convex (b) concave (c) plane (d) any one of the above

A ship sends out ultrasound that returns from the seabed and is detected after 5 s. If the speed of ultrasound through seawater is 1600 m/s, what is the distance of the seabed from the ship?

The critical angle for a light ray travelling from denser to rarer medium is defined as the angle of incidence at which the light refracts at 90∘ (angle of refraction). If a ray of light travels from water (μw) to air (μa). Find the critical angle?

Question 12 If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be (a) 100% (b) 200% (c) 300% (d) 400%

For earthing an electric appliance, one has to remove the paint from the metallic body of the appliance where the electric contact is made. Explain the reason.

why do we use an aqueous solution of sodium chloride for electrolysis instead of molten sodium chloride?

Should fuse have low resistance or high.Give reason

In a prism, is angle of incidence always equal to angle of emergence?

If the incident ray makes the same angle with normal of two interfaces,air-water interface &amp; air-diamond interface, in which medium value of 'angle of refralow?' is low ?

Ministry of Drinking Water and Sanitation is nodal Ministry in implementation of which of the following Programmes: Which of the above statements is/are correct?

If an object is at a considerable distance (or infinity) in front of a convex lens, where is the image formed ?

Skin cancer is caused by___.

Where would the image be formed by a convex mirror if the object is placed : (a) between infinity and pole of the mirror ? (b) at infinity ? Draw labelled ray-diagrams to show the formation of image in both the cases.

What is meant by "sustainable development"?

A wire of resistance 9 ohm having length 30 cm is tripled on itself. What is its new resistance?

What is the use of oscillator in cyclotron?

In a conductor, 6.25×1016 electrons frow from its end A to B in 2 s. Find the current flowing through the conductor. (e=1.6×10−19 C).

Define the term electric potential. State its S.I. Unit.

What may be considered " simple applications " of different types of vibrations( including resonance).....(As given in the ICSE syllabus )

Where will parallel rays meet/appear to meet ?

Two electrodes are maintained at a potential difference of 100V. How much kinetic energy would an electron gain,moving from cathode to anode ?

The focal length of the convex lens is 20 cm and focal length of the concave mirror is 30 cm. And the separation between lens and mirror is 90 cm. If the object is placed 60 cm before the lens, find out the position of the image formed by the concave mirror.

A nuclear reaction is involved in generating electrical energy from nuclear energy. Name the reaction.

A person can read a book clearly only if he holds it at an arm's length from him. Name the defect of vision : (a) if the person is an old man (b) if the person is a young man

The red colour of the sun at the time of sunrise and sunset is because : (a) red colour is least scattered (b) blue colour is least scattered (c) red colour is most scattered (d) blue colour is most scattered

What is mean free path?

Write an expression for the electrical energy spent in flow of current through an electrical appliance in terms of current, resistance and time.

2 kg of ice melts when water at 100∘ is poured in a hole drilled in a block of ice. What mass of water was used? Given: Specific heat capacity of water=4200 J kg−1 K−1,specific latent heat of ice=336×103 J kg−1.

Name the patriotic song composed by Rabindranath Tagore which was sung by huge crowds parading the streets.

A man who cannot see clearly beyond 5 m wants to see stars clearly. He should use a lens of focal length ___ m.

When a star reaches a certain point in its life, it may explode and become a supernova. When it does this, it gives out energy in the form of waves which travel to the earth through space. Which of these could not be received from the star?

On burning completely 2.5 kg of a fuel produces 87500 kJ of heat energy. The Calorific value of the fuel is –

If the incident ray makes the same angle with normal of two interfaces,air-water interface & air-diamond interface, in which medium value of 'angle of refralow?' is low ?