16569 + Interview Questions in Physics

1.	Find the center of mass with respect to 0, of uniform semicircular wire of mass M and Radius R (as shown in figure)
Answer» Find the center of mass with respect to 0, of uniform semicircular wire of mass M and Radius R (as shown in figure)

1.

Find the center of mass with respect to 0, of uniform semicircular wire of mass M and Radius R (as shown in figure)

Answer»

Find the center of mass with respect to 0, of uniform semicircular wire of mass M and Radius R (as shown in figure)

2.	At which of the following locations, the value of g is the largest ?
Answer» At which of the following locations, the value of g is the largest ?

Discussion

3.	State Kepler's laws of planetary motion.
Answer» State Kepler's laws of planetary motion.

Discussion

4.	Question 129(i) Astronomy The table shows the mass of the planets, the Sun and the Moon in our solar system. Write the mass of each planet and the Moon in scientific notation.
Answer» Question 129(i) Astronomy The table shows the mass of the planets, the Sun and the Moon in our solar system. Write the mass of each planet and the Moon in scientific notation.

4.

Question 129(i) Astronomy The table shows the mass of the planets, the Sun and the Moon in our solar system. Write the mass of each planet and the Moon in scientific notation.

Answer»

Question 129(i)

Astronomy The table shows the mass of the planets, the Sun and the Moon in our solar system.

Write the mass of each planet and the Moon in scientific notation.

Discussion

5.	Name the colour of white light which is deviated (i) the most, and (ii) the least, on passing through a prism.
Answer» Name the colour of white light which is deviated (i) the most, and (ii) the least, on passing through a prism.

Discussion

6.	Where must a point source of light be placed in front of a convex lens so as to obtain a parallel beam of light?
Answer» Where must a point source of light be placed in front of a convex lens so as to obtain a parallel beam of light?

Discussion

7.	If mass and radius of the Earth are 6.0×1024 kg and 6.4×106 m respectively, calculate the force exerted by the Earth on a body of mass 1 kg. Also, calculate acceleration produced in the body of mass 1 kg and acceleration produced in the Earth. The accelerations of 1 kg mass and Earth are:
Answer» If mass and radius of the Earth are $6.0 \times 10^{24}$ kg and $6.4 \times 10^{6}$ m respectively, calculate the force exerted by the Earth on a body of mass 1 kg. Also, calculate acceleration produced in the body of mass 1 kg and acceleration produced in the Earth. The accelerations of 1 kg mass and Earth are:

7.

If mass and radius of the Earth are 6.0×1024 kg and 6.4×106 m respectively, calculate the force exerted by the Earth on a body of mass 1 kg. Also, calculate acceleration produced in the body of mass 1 kg and acceleration produced in the Earth. The accelerations of 1 kg mass and Earth are:

Answer»

If mass and radius of the Earth are $6.0 \times 10^{24}$ kg and $6.4 \times 10^{6}$ m respectively, calculate the force exerted by the Earth on a body of mass 1 kg. Also, calculate acceleration produced in the body of mass 1 kg and acceleration produced in the Earth.

The accelerations of 1 kg mass and Earth are:

Discussion

8.	Snell’s law of refraction is given by,
Answer» Snell’s law of refraction is given by,

Discussion

9.	Electra has trouble finding the correct Nernst equation for the cell Zn(s)\|Zn2+\|\|Cu2+\|Cu(s) at 25∘C Can you help her?
Answer» Electra has trouble finding the correct Nernst equation for the cell $Z n (s) \| Z n^{2 +} \| \| C u^{2 +} \| C u (s) a t 25^{\circ} C$ Can you help her?

Discussion

10.	When electric current flows through a conductor, the conductor gets
Answer» When electric current flows through a conductor, the conductor gets

Discussion

11.	Which country is called the country of winds? Why? [2 MARKS]
Answer» Which country is called the country of winds? Why? [2 MARKS]

Discussion

12.	The maximum capacity to hold the electrons in the first shell is.
Answer» The maximum capacity to hold the electrons in the first shell is.

Discussion

13.	The colour of live wire is:
Answer» The colour of live wire is:

Discussion

14.	Name the process used for producing electricity from the nuclear energy.
Answer» Name the process used for producing electricity from the nuclear energy.

Discussion

15.	An electric room heater is rated at 2kW . Calculate the cost of using it for 2 hours daily in the month of September for 30 days if each unit costs Rs 4
Answer» An electric room heater is rated at 2kW . Calculate the cost of using it for 2 hours daily in the month of September for 30 days if each unit costs Rs 4

Discussion

16.	Question 131(i) This table shows the mass of one atom for five chemical elements. Use it to answer the questions given. ElementsMass of atom(kg)Titanium7.95×10−26Lead3.44×10−25Silver1.79×10−25Lithium1.15×10−26Hydrogen1.674×10−27 Which is the heaviest element?
Answer» Question 131(i) This table shows the mass of one atom for five chemical elements. Use it to answer the questions given. $\begin{matrix} E l e m e n t s & M a s s o f a t o m (k g) T i t a n i u m & 7.95 \times 10^{- 26} L e a d & 3.44 \times 10^{- 25} S i l v e r & 1.79 \times 10^{- 25} L i t h i u m & 1.15 \times 10^{- 26} H y d r o g e n & 1.674 \times 10^{- 27} \end{matrix}$ Which is the heaviest element?

16.

Question 131(i) This table shows the mass of one atom for five chemical elements. Use it to answer the questions given. ElementsMass of atom(kg)Titanium7.95×10−26Lead3.44×10−25Silver1.79×10−25Lithium1.15×10−26Hydrogen1.674×10−27 Which is the heaviest element?

Answer»

Question 131(i)

This table shows the mass of one atom for five chemical elements.
Use it to answer the questions given.
$\begin{matrix} E l e m e n t s & M a s s o f a t o m (k g) T i t a n i u m & 7.95 \times 10^{- 26} L e a d & 3.44 \times 10^{- 25} S i l v e r & 1.79 \times 10^{- 25} L i t h i u m & 1.15 \times 10^{- 26} H y d r o g e n & 1.674 \times 10^{- 27} \end{matrix}$
Which is the heaviest element?

Discussion

17.	In a village named Kowakol in Bihar, there is no electricity. Still Mr. Darshan Ram uses many electric appliances at his home like TV and Fridge. He is using a device to produce electricity. But Mr. Ram is not able to use electric appliances when the weather is cloudy. What is that device called?
Answer» In a village named Kowakol in Bihar, there is no electricity. Still Mr. Darshan Ram uses many electric appliances at his home like TV and Fridge. He is using a device to produce electricity. But Mr. Ram is not able to use electric appliances when the weather is cloudy. What is that device called?

Discussion

18.	Express the power (with sign) of a concave lens of focal length 20 cm.
Answer» Express the power (with sign) of a concave lens of focal length 20 cm.

Discussion

19.	Bohr's Model of the atom included the idea(s) like:
Answer» Bohr's Model of the atom included the idea(s) like:

Discussion

20.	What happens in the fuse which melts it to break the electrical circuit?
Answer» What happens in the fuse which melts it to break the electrical circuit?

Discussion

21.	Nichrome is used in the coils of a heater because of its ______________.
Answer» Nichrome is used in the coils of a heater because of its ______________.

Discussion

22.	Match the number of electrons that can be filled in the following shells:
Answer» Match the number of electrons that can be filled in the following shells:

Discussion

23.	In a straight current-carrying wire, the magnetic field lines are:
Answer» In a straight current-carrying wire, the magnetic field lines are:

Discussion

24.	Which unit is used to express reactance in conductors and capacitors?
Answer» Which unit is used to express reactance in conductors and capacitors?

Discussion

25.	In Fleming's left hand rule, What does the thumb, fore finger and middle finger denote?
Answer» In Fleming's left hand rule, What does the thumb, fore finger and middle finger denote?

Discussion

26.	To form an enlarged image the object should be placed in front of a convex lens
Answer» To form an enlarged image the object should be placed in front of a convex lens

Discussion

27.	Determine the magnitude of frictional force in each of the following cases:
Answer» Determine the magnitude of frictional force in each of the following cases:

Discussion

28.	Name two effects produced by the atmospheric refraction.
Answer» Name two effects produced by the atmospheric refraction.

Discussion

29.	Why do mustard seeds pop while cooking?
Answer» Why do mustard seeds pop while cooking?

Discussion

30.	Define watt. Write down an equation linking watts, volts and amperes.
Answer» Define watt. Write down an equation linking watts, volts and amperes.

Discussion

31.	A vessel contains M grams of water at a certain temperature and water at certain other temperature is passed into it at a constant rate of m g/s. The variation of temperature of the mixture with the time is shown in Fig. The values of M and m are, respectively (the heat exchanged after a long time is 800 cal)
Answer» A vessel contains M grams of water at a certain temperature and water at certain other temperature is passed into it at a constant rate of m g/s. The variation of temperature of the mixture with the time is shown in Fig. The values of M and m are, respectively (the heat exchanged after a long time is 800 cal)

31.

A vessel contains M grams of water at a certain temperature and water at certain other temperature is passed into it at a constant rate of m g/s. The variation of temperature of the mixture with the time is shown in Fig. The values of M and m are, respectively (the heat exchanged after a long time is 800 cal)

Answer»

A vessel contains M grams of water at a certain temperature and water at certain other temperature is passed into it at a constant rate of m g/s. The variation of temperature of the mixture with the time is shown in Fig. The values of M and m are, respectively (the heat exchanged after a long time is 800 cal)

Discussion

32.	A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is (a) towards south (b) towards east (c) downward (d) upward
Answer» A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is (a) towards south (b) towards east (c) downward (d) upward

Discussion

33.	A portion of straight glass rod of diameter 4 cm and refractive index 1.5 is bent into an arc of circle of radius R and a parallel beam of light is incident on it as shown in figure. Radius of arc includes outer edge of glass rod. Smallest R in cm which permits all the light to pass around arc is (Write upto two digits after the decimal point.)
Answer» A portion of straight glass rod of diameter 4 cm and refractive index 1.5 is bent into an arc of circle of radius R and a parallel beam of light is incident on it as shown in figure. Radius of arc includes outer edge of glass rod. Smallest R in cm which permits all the light to pass around arc is (Write upto two digits after the decimal point.)

Discussion

34.	What is the function of iris?
Answer» What is the function of iris?

Discussion

35.	Statement 1: Charcoal is a better biomass than wood. Statement 2: Charcoal burns without flames; is comparatively smokeless and has higher heat generation.
Answer» Statement 1: Charcoal is a better biomass than wood. Statement 2: Charcoal burns without flames; is comparatively smokeless and has higher heat generation.

Discussion

36.	Question 17 A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
Answer» Question 17 A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

Discussion

37.	Give one use each of (a) microwaves , (b) ultraviolet radiations , (c) infrared radiations, and (d) gamma rays.
Answer» Give one use each of (a) microwaves , (b) ultraviolet radiations , (c) infrared radiations, and (d) gamma rays.

Discussion

38.	Refer to the diagram given below. What is the reading of the ammeter?
Answer» Refer to the diagram given below. What is the reading of the ammeter?

38.

Refer to the diagram given below. What is the reading of the ammeter?

Answer»

Refer to the diagram given below.

What is the reading of the ammeter?

Discussion

39.	A geyser has a rating of 2 kW, 240 V. What is the cost of using it for 30 minutes if the cost of electricity is Rs. 3 per commercial units?
Answer» A geyser has a rating of 2 kW, 240 V. What is the cost of using it for 30 minutes if the cost of electricity is Rs. 3 per commercial units?

Discussion

40.	A person standing on the edge of a cliff of height 40 m above the ground throws the first ball straight up with an initial velocity of 20 ms, and then throws the second ball straight down with the same initial velocity 20 ms. What are their respective velocities just before they hit the ground? (Take a = 10 m/s2)
Answer» A person standing on the edge of a cliff of height 40 m above the ground throws the first ball straight up with an initial velocity of 20 $\frac{m}{s}$ , and then throws the second ball straight down with the same initial velocity 20 $\frac{m}{s}$ . What are their respective velocities just before they hit the ground? (Take a = 10 $m / s^{2}$ )

Discussion

41.	A solenoid that is carrying current has magnetic field lines similar to that of ____.
Answer» A solenoid that is carrying current has magnetic field lines similar to that of ____.

Discussion

42.	A SONAR device uses ultrasound to find out the average depth of the Caspian Sea. The sound of wavelength 10 mm and frequency 150 kHz, reflects back to the device in about 1.4 s. What is the depth of the sea in km?1.05
Answer» A SONAR device uses ultrasound to find out the average depth of the Caspian Sea. The sound of wavelength $10 mm$ and frequency $150 kHz$ , reflects back to the device in about $1.4 s$ . What is the depth of the sea in $km$ ? 1.05

Discussion

43.	Which of the following resources are exhaustible?
Answer» Which of the following resources are exhaustible?

Discussion

44.	In the circuit diagram given below. Find (i) Total resistance of the circuit (ii) Total current flowing in the circuit (iii) Potential difference across R1 4. Define one ohm. 5. Define one ampere of current. [5 MARKS]
Answer» In the circuit diagram given below. Find (i) Total resistance of the circuit (ii) Total current flowing in the circuit (iii) Potential difference across $R_{1}$ 4. Define one ohm. 5. Define one ampere of current. [5 MARKS]

Discussion

45.	Among convex lens of focal length 50 cm or convex lens of focal length 5cm, which one will provide more magnification?
Answer» Among convex lens of focal length 50 cm or convex lens of focal length 5cm, which one will provide more magnification?

Discussion

46.	In a battery, what separates negative charge from the positive charge?
Answer» In a battery, what separates negative charge from the positive charge?

Discussion

47.	A concave lens forms the image of an object which is : (a) virtual, inverted, and diminished (b) virtual, upright, and diminished (c) virtual, inverted, and enlarged (d) virtual, upright, and enlarged.
Answer» A concave lens forms the image of an object which is : (a) virtual, inverted, and diminished (b) virtual, upright, and diminished (c) virtual, inverted, and enlarged (d) virtual, upright, and enlarged.

47.

A concave lens forms the image of an object which is : (a) virtual, inverted, and diminished (b) virtual, upright, and diminished (c) virtual, inverted, and enlarged (d) virtual, upright, and enlarged.

Answer»

A concave lens forms the image of an object which is :

(a) virtual, inverted, and diminished

(b) virtual, upright, and diminished

(c) virtual, inverted, and enlarged

(d) virtual, upright, and enlarged.

Discussion

48.	A bar magnet was cut into two pieces initially; Again, each of these new pieces was cut into two more pieces, and this process was repeated once more. Then,___ is the number of north poles.
Answer» A bar magnet was cut into two pieces initially; Again, each of these new pieces was cut into two more pieces, and this process was repeated once more. Then,___ is the number of north poles.

Discussion

49.	the speed of light in vacuum is????
Answer» the speed of light in vacuum is????

Discussion

50.	Question 24 Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5. Find out the absolute refractive index of a diamond.
Answer» Question 24 Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5. Find out the absolute refractive index of a diamond.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Find the center of mass with respect to 0, of uniform semicircular wire of mass M and Radius R (as shown in figure)

At which of the following locations, the value of g is the largest ?

State Kepler's laws of planetary motion.

Question 129(i) Astronomy The table shows the mass of the planets, the Sun and the Moon in our solar system. Write the mass of each planet and the Moon in scientific notation.

Name the colour of white light which is deviated (i) the most, and (ii) the least, on passing through a prism.

Where must a point source of light be placed in front of a convex lens so as to obtain a parallel beam of light?

If mass and radius of the Earth are 6.0×1024 kg and 6.4×106 m respectively, calculate the force exerted by the Earth on a body of mass 1 kg. Also, calculate acceleration produced in the body of mass 1 kg and acceleration produced in the Earth. The accelerations of 1 kg mass and Earth are:

Snell’s law of refraction is given by,

Electra has trouble finding the correct Nernst equation for the cell Zn(s)|Zn2+||Cu2+|Cu(s) at 25∘C Can you help her?

When electric current flows through a conductor, the conductor gets

Which country is called the country of winds? Why? [2 MARKS]

The maximum capacity to hold the electrons in the first shell is.

The colour of live wire is:

Name the process used for producing electricity from the nuclear energy.

An electric room heater is rated at 2kW . Calculate the cost of using it for 2 hours daily in the month of September for 30 days if each unit costs Rs 4

Question 131(i) This table shows the mass of one atom for five chemical elements. Use it to answer the questions given. ElementsMass of atom(kg)Titanium7.95×10−26Lead3.44×10−25Silver1.79×10−25Lithium1.15×10−26Hydrogen1.674×10−27 Which is the heaviest element?

In a village named Kowakol in Bihar, there is no electricity. Still Mr. Darshan Ram uses many electric appliances at his home like TV and Fridge. He is using a device to produce electricity. But Mr. Ram is not able to use electric appliances when the weather is cloudy. What is that device called?

Express the power (with sign) of a concave lens of focal length 20 cm.

Bohr's Model of the atom included the idea(s) like:

What happens in the fuse which melts it to break the electrical circuit?

Nichrome is used in the coils of a heater because of its ______________.

Match the number of electrons that can be filled in the following shells:

In a straight current-carrying wire, the magnetic field lines are:

Which unit is used to express reactance in conductors and capacitors?

In Fleming's left hand rule, What does the thumb, fore finger and middle finger denote?

To form an enlarged image the object should be placed in front of a convex lens

Determine the magnitude of frictional force in each of the following cases:

Name two effects produced by the atmospheric refraction.

Why do mustard seeds pop while cooking?

Define watt. Write down an equation linking watts, volts and amperes.

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is (a) towards south (b) towards east (c) downward (d) upward

What is the function of iris?

Statement 1: Charcoal is a better biomass than wood. Statement 2: Charcoal burns without flames; is comparatively smokeless and has higher heat generation.

Question 17 A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

Give one use each of (a) microwaves , (b) ultraviolet radiations , (c) infrared radiations, and (d) gamma rays.

Refer to the diagram given below. What is the reading of the ammeter?

A geyser has a rating of 2 kW, 240 V. What is the cost of using it for 30 minutes if the cost of electricity is Rs. 3 per commercial units?

A solenoid that is carrying current has magnetic field lines similar to that of ____.

A SONAR device uses ultrasound to find out the average depth of the Caspian Sea. The sound of wavelength 10 mm and frequency 150 kHz, reflects back to the device in about 1.4 s. What is the depth of the sea in km?1.05

Which of the following resources are exhaustible?

In the circuit diagram given below. Find (i) Total resistance of the circuit (ii) Total current flowing in the circuit (iii) Potential difference across R1 4. Define one ohm. 5. Define one ampere of current. [5 MARKS]

Among convex lens of focal length 50 cm or convex lens of focal length 5cm, which one will provide more magnification?

In a battery, what separates negative charge from the positive charge?

A concave lens forms the image of an object which is : (a) virtual, inverted, and diminished (b) virtual, upright, and diminished (c) virtual, inverted, and enlarged (d) virtual, upright, and enlarged.

A bar magnet was cut into two pieces initially; Again, each of these new pieces was cut into two more pieces, and this process was repeated once more. Then,___ is the number of north poles.

the speed of light in vacuum is????

Question 24 Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5. Find out the absolute refractive index of a diamond.