16569 + Interview Questions in Physics

1.	when a 100 W 240 V is operated at 200 V ,then current in it is
Answer» when a 100 W 240 V is operated at 200 V ,then current in it is

Discussion

2.	The refractive index of the material of the prism and liquid are 1.56 and 1.32 respectively. What will be the value of θ?
Answer» The refractive index of the material of the prism and liquid are $1.56$ and $1.32$ respectively. What will be the value of θ?

Discussion

3.	107.a and b are two points on a uniform ring of radius r . The resistance of the ring R and angle AOB= theta . The equivalent resistance between points A and B is'?
Answer» 107.a and b are two points on a uniform ring of radius r . The resistance of the ring R and angle AOB= theta . The equivalent resistance between points A and B is'?

Discussion

4.	7.Safety fuse is a device which protect the appliances in the circuite from the damages due to the flow ofexcess current. What is the principle of safety fuse
Answer» 7.Safety fuse is a device which protect the appliances in the circuite from the damages due to the flow ofexcess current. What is the principle of safety fuse

Discussion

5.	what is performated cathod
Answer» what is performated cathod

Discussion

6.	112.Does a rectangular glass slab also disperse white light into constituent colours?
Answer» 112.Does a rectangular glass slab also disperse white light into constituent colours?

Discussion

7.	OJ T9I6T26. Two thin lenses of power +5D and- 2.5 D are in contact. What is the focallength of the combination? All India 2010
Answer» OJ T9I6T26. Two thin lenses of power +5D and- 2.5 D are in contact. What is the focallength of the combination? All India 2010

Discussion

8.	(a)Have you ever thought how do you feel the climatic changes in the environment? (b)How do you see an object and its colour? (c)How do you hear a sound?
Answer» (a)Have you ever thought how do you feel the climatic changes in the environment? (b)How do you see an object and its colour? (c)How do you hear a sound?

Discussion

9.	Energy crisis is due to
Answer» Energy crisis is due to

Discussion

10.	Why power is inversely proportional to the resistance when voltage is kept constant and Why power is directly proportional to resistance when current is kept constant?
Answer» Why power is inversely proportional to the resistance when voltage is kept constant and Why power is directly proportional to resistance when current is kept constant?

Discussion

11.	we know power (p) = v^2/R and p = I^2R. if it is asked to find resistance how do we know which formula to use. please explain in detail
Answer» we know power (p) = v^2/R and p = I^2R. if it is asked to find resistance how do we know which formula to use. please explain in detail

Discussion

12.	If f is the focal length of the lens, then the power of the lens is equal to
Answer» If $f$ is the focal length of the lens, then the power of the lens is equal to

Discussion

13.	200 MeV energy is released when one nucleus of U235 undergoes fission. The number of fissions per second required for producing a power of 16 MW is-
Answer» $200 MeV$ energy is released when one nucleus of $U^{235}$ undergoes fission. The number of fissions per second required for producing a power of $16 MW$ is-

Discussion

14.	Which of following is the fastest means of transportation?
Answer» Which of following is the fastest means of transportation?

Discussion

15.	The radius of the earth is R and acceleration due to gravity at its surface is g. If a body of mass m is sent to a height R6 from the earth's surface, the potential energy increases by
Answer» The radius of the earth is $R$ and acceleration due to gravity at its surface is $g$ . If a body of mass $m$ is sent to a height $\frac{R}{6}$ from the earth's surface, the potential energy increases by

Discussion

16.	If an object is in uniform circular motion, it has a constant_______ but a changing______.
Answer» If an object is in uniform circular motion, it has a constant_______ but a changing______.

Discussion

17.	An ideal gas has volume v ai 27'C .it is heated at constant pressure .so that, it's volume becomes 2v .The final temperature is
Answer» An ideal gas has volume v ai 27'C .it is heated at constant pressure .so that, it's volume becomes 2v .The final temperature is

Discussion

18.	A cylinder rolling down the incline without slipping is an example of___.
Answer» A cylinder rolling down the incline without slipping is an example of___.

Discussion

19.	The picture shows a bucket being whirled around in a circle (neglect gravity). Think about the correlation between this action and the motion of the moon around the earth. Then pick out the incorrect statement.
Answer» The picture shows a bucket being whirled around in a circle (neglect gravity). Think about the correlation between this action and the motion of the moon around the earth. Then pick out the incorrect statement.

Discussion

20.	When do you generally use a mirror?
Answer» When do you generally use a mirror?

Discussion

21.	Question 30How does refraction takes place in the atmosphere? Why do stars twinkle but not the planets?
Answer» Question 30 How does refraction takes place in the atmosphere? Why do stars twinkle but not the planets?

Discussion

22.	Question 14 A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity.
Answer» Question 14 A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity.

Discussion

23.	What is the force on a current-carrying wire that is parallel to a magnetic field ? Give reason for your answer.
Answer» What is the force on a current-carrying wire that is parallel to a magnetic field ? Give reason for your answer.

Discussion

24.	A submarine sends out ultrasound and is detected after 3.425 s. If the speed of ultrasound in seawater is 1531 m/s, what is the distance of seabed from the submarine?
Answer» A submarine sends out ultrasound and is detected after $3.425 s$ . If the speed of ultrasound in seawater is $1531 m/s$ , what is the distance of seabed from the submarine?

Discussion

25.	3. The focal length of the lens of (n= 1.5) in air is 10cm. If air is replaced by water of n=1.33,its focal length is
Answer» 3. The focal length of the lens of (n= 1.5) in air is 10cm. If air is replaced by water of n=1.33,its focal length is

Discussion

26.	A piece of iron of mass 2.0 kg has a thermal capacity of 966 J/0C. Find: (i) Heat energy needed to warm it by 150C, and (ii) Its specific heat capacity in SI unit
Answer» A piece of iron of mass 2.0 kg has a thermal capacity of 966 J/⁰C. Find: (i) Heat energy needed to warm it by 15⁰C, and (ii) Its specific heat capacity in SI unit

Discussion

27.	9 calculate the glancing angle of a cube(1,0,0) of a rock salt(a=2.814 angstrom) corresponding to second order diffraction maximum for x-rays of wavelength 0.710 angstrom
Answer» 9 calculate the glancing angle of a cube(1,0,0) of a rock salt(a=2.814 angstrom) corresponding to second order diffraction maximum for x-rays of wavelength 0.710 angstrom

Discussion

28.	Three students measured the focal length of a convex lens using parallel rays from a distant object. All of them measured the distance between the lens and the inverted image on the screen.(i) Student A saw a sharp image on the screen and labelled the distance as f1(ii) Student B saw a slightly larger blurred image on the screen and labelled the distance as f2 (iii) Student C saw slightly smaller blurred image on the screen and labelled the distance as f3The relation between the three measurements would most likely be(1) f1 = f2 = f3 (2) f1 < f2 < f3 (3) f3 < f1 < f2 (4) f1 < f2 and f1 = f3
Answer» Three students measured the focal length of a convex lens using parallel rays from a distant object. All of them measured the distance between the lens and the inverted image on the screen. (i) Student A saw a sharp image on the screen and labelled the distance as f₁ (ii) Student B saw a slightly larger blurred image on the screen and labelled the distance as f₂ (iii) Student C saw slightly smaller blurred image on the screen and labelled the distance as f₃ The relation between the three measurements would most likely be (1) f₁ = f₂ = f₃ (2) f₁ < f₂ < f₃ (3) f₃ < f₁ < f₂ (4) f₁ < f₂ and f₁ = f₃

Discussion

29.	Magnetic field of a conducting loop is B=0.2sin300t. Angle between area vector and B is 60^°. Area is 5 cm2 . Find maximum emf of loop
Answer» Magnetic field of a conducting loop is B=0.2sin300t. Angle between area vector and B is 60^°. Area is 5 cm2 . Find maximum emf of loop

Discussion

30.	If a lense is sunk into water then its focal length will changewhy??
Answer» If a lense is sunk into water then its focal length will changewhy??

Discussion

31.	Two positively charged particles each of mass1.7×10-27 kg and each carrying a charge 1.6×10-19C are placed r dis†an ce apart .If each experiences s repulsive force equal to its weight ten find r
Answer» Two positively charged particles each of mass1.7×10-27 kg and each carrying a charge 1.6×10-19C are placed r dis†an ce apart .If each experiences s repulsive force equal to its weight ten find r

Discussion

32.	15. If speed of light is 3.0 100000000m/s calculate the distance covered by light in 2.00 ns
Answer» 15. If speed of light is 3.0 100000000m/s calculate the distance covered by light in 2.00 ns

Discussion

33.	a resistor of 8 ohm is connected in parallel with another resistor X .the resultant resistance of combination is 9.8 ohm. what is value of resistance X
Answer» a resistor of 8 ohm is connected in parallel with another resistor X .the resultant resistance of combination is 9.8 ohm. what is value of resistance X

Discussion

34.	What is the mass and volume of all the planets?
Answer» What is the mass and volume of all the planets?

Discussion

35.	A free body is acted upon by two unequal forces in opposite directions, but not in one line. The effect is that
Answer» A free body is acted upon by two unequal forces in opposite directions, but not in one line. The effect is that

Discussion

36.	An object is placed perpendicular to the principal axis of a lens of focal length f at a distance of 20 cm from the lens which produces an image at a distance 12 cm on the same side of the object in front of the lens. Find the focal length of the lens and state the type of lens. [4 MARKS]
Answer» An object is placed perpendicular to the principal axis of a lens of focal length f at a distance of 20 cm from the lens which produces an image at a distance 12 cm on the same side of the object in front of the lens. Find the focal length of the lens and state the type of lens. [4 MARKS]

Discussion

37.	Both Sun and a Star have Helium and Hydrogen but the sun light is yellow or orange and the star light is white. Why?
Answer» Both Sun and a Star have Helium and Hydrogen but the sun light is yellow or orange and the star light is white. Why?

37.

Both Sun and a Star have Helium and Hydrogen but the sun light is yellow or orange and the star light is white. Why?

Answer»

Both Sun and a Star have Helium and Hydrogen but the sun light is yellow or orange and the star light is white.

Why?

Discussion

38.	A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is
Answer» A $220 V$ input is supplied to a transformer. The output circuit draws a current of $2.0 A$ at $440 V$ . If the efficiency of the transformer is $80$ %, the current drawn by the primary windings of the transformer is

Discussion

39.	Question 12An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.
Answer» Question 12 An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.

Discussion

40.	State 5 differences between refraction by glass prism and glass slab. (Note:In TABULAR form)
Answer» State 5 differences between refraction by glass prism and glass slab. (Note:In TABULAR form)

Discussion

41.	7.A voltmeter has a range 0-V with a series resistance R. With a series resistance 2R , the range is 0-V' is (1)V'=2V (2) V'>2V (3)V'>>2V (4) V'
Answer» 7.A voltmeter has a range 0-V with a series resistance R. With a series resistance 2R , the range is 0-V' is (1)V'=2V (2) V'>2V (3)V'>>2V (4) V'<2V

Discussion

42.	A battery of 9 V is connected in series with resistors of 0.2Ω,0.3Ω,0.4Ω,0.5Ωand12Ω. How much current would flow through the 12Ω resistor?
Answer» A battery of 9 V is connected in series with resistors of $0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω a n d 12 Ω .$ How much current would flow through the $12 Ω$ resistor?

Discussion

43.	14. 3 to the power 98 when divided by 5 what is the remainder??
Answer» 14. 3 to the power 98 when divided by 5 what is the remainder??

Discussion

44.	Two different wires, whose specific resistance are inthe ratio 2 : 3, length 3 4 and radius of cross-section 1:2. The ratio of their resistances is
Answer» Two different wires, whose specific resistance are inthe ratio 2 : 3, length 3 4 and radius of cross-section 1:2. The ratio of their resistances is

Discussion

45.	a) Explain the shining of an air bubble in water. b) A convex lens forms an image of the same size as the object at a distance of 30 cm from the lens. What is the distance of the object from the lens? What is the power of the lens? [5 MARKS]
Answer» a) Explain the shining of an air bubble in water. b) A convex lens forms an image of the same size as the object at a distance of 30 cm from the lens. What is the distance of the object from the lens? What is the power of the lens? [5 MARKS]

Discussion

46.	The inductors of two LR circuits are placed next to each other, as shown in the figure. The values of the self-inductance of the inductors, resistances, mutual-inductance and applied voltages are specified in the given circuit. After both the switches are closed simultaneously, the total work done by the batteries against the induced EMF in the inductors by the time the currents reach their steady state values is _____ mJ.
Answer» The inductors of two $L R$ circuits are placed next to each other, as shown in the figure. The values of the self-inductance of the inductors, resistances, mutual-inductance and applied voltages are specified in the given circuit. After both the switches are closed simultaneously, the total work done by the batteries against the induced $E M F$ in the inductors by the time the currents reach their steady state values is _____ $mJ$ .

Discussion

47.	A charged cloud system produces an electric field in the air near the earth's surface. A particle of charge16.2×10−19C is acted on by a downward electrostaticforce of 3×10−6N when placed in this field. The gravitational and electrostatic force, respectively,exerted on a proton placed in this field are(1) 1.64×10−26N , 2.4×10−16N (2) 1.64×10−26N, 2.9×10−16N (3) 1.56×10−18N, 2.4×10−16N (4)2.9×10−17N ,1.64×10−26N
Answer» A charged cloud system produces an electric field in the air near the earth's surface. A particle of charge ${16.2 \times 10}^{- 19} C$ is acted on by a downward electrostaticforce of $3 \times 10^{- 6} N$ when placed in this field. The gravitational and electrostatic force, respectively,exerted on a proton placed in this field are (1) $1.64 \times 10^{- 26} N$ , $2.4 \times 10^{- 16} N$ (2) $1.64 \times 10^{- 26} N$ , $2.9 \times 10^{- 16} N$ (3) $1.56 \times 10^{- 18} N$ , $2.4 \times 10^{- 16} N$ (4) $2.9 \times 10^{- 17} N$ , $1.64 \times 10^{- 26} N$

47.

A charged cloud system produces an electric field in the air near the earth's surface. A particle of charge16.2×10−19C is acted on by a downward electrostaticforce of 3×10−6N when placed in this field. The gravitational and electrostatic force, respectively,exerted on a proton placed in this field are(1) 1.64×10−26N , 2.4×10−16N (2) 1.64×10−26N, 2.9×10−16N (3) 1.56×10−18N, 2.4×10−16N (4)2.9×10−17N ,1.64×10−26N

Answer»

A charged cloud system produces an electric field in the air near the earth's surface. A particle of charge ${16.2 \times 10}^{- 19} C$ is acted on by a downward electrostaticforce of $3 \times 10^{- 6} N$ when placed in this field. The gravitational and electrostatic force, respectively,exerted on a proton placed in this field are

(1) $1.64 \times 10^{- 26} N$ , $2.4 \times 10^{- 16} N$

(2) $1.64 \times 10^{- 26} N$ , $2.9 \times 10^{- 16} N$

(3) $1.56 \times 10^{- 18} N$ , $2.4 \times 10^{- 16} N$

(4) $2.9 \times 10^{- 17} N$ , $1.64 \times 10^{- 26} N$

Discussion

48.	A magnetic needle show a deflection when brought close to a current-carrying conductor because
Answer» A magnetic needle show a deflection when brought close to a current-carrying conductor because

Discussion

49.	Two long current carrying wires. separated by a distance d carry currents I1 and I2 in the same direction They exert a force F on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also Increased to 3d The new value of the force between them is
Answer» Two long current carrying wires. separated by a distance $d$ carry currents $I_{1}$ and $I_{2}$ in the same direction They exert a force $F$ on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also Increased to $3 d$ The new value of the force between them is

Discussion

50.	What will be the radius of 64Cu nucleus if the radius of 27Al Al nucleus is RAl ?
Answer» What will be the radius of $^{64} C u$ nucleus if the radius of $^{27} A l$ Al nucleus is $R_{A l}$ ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

when a 100 W 240 V is operated at 200 V ,then current in it is

The refractive index of the material of the prism and liquid are 1.56 and 1.32 respectively. What will be the value of θ?

107.a and b are two points on a uniform ring of radius r . The resistance of the ring R and angle AOB= theta . The equivalent resistance between points A and B is'?

7.Safety fuse is a device which protect the appliances in the circuite from the damages due to the flow ofexcess current. What is the principle of safety fuse

what is performated cathod

112.Does a rectangular glass slab also disperse white light into constituent colours?

OJ T9I6T26. Two thin lenses of power +5D and- 2.5 D are in contact. What is the focallength of the combination? All India 2010

(a)Have you ever thought how do you feel the climatic changes in the environment? (b)How do you see an object and its colour? (c)How do you hear a sound?

Energy crisis is due to

Why power is inversely proportional to the resistance when voltage is kept constant and Why power is directly proportional to resistance when current is kept constant?

we know power (p) = v^2/R and p = I^2R. if it is asked to find resistance how do we know which formula to use. please explain in detail

If f is the focal length of the lens, then the power of the lens is equal to

200 MeV energy is released when one nucleus of U235 undergoes fission. The number of fissions per second required for producing a power of 16 MW is-

Which of following is the fastest means of transportation?

The radius of the earth is R and acceleration due to gravity at its surface is g. If a body of mass m is sent to a height R6 from the earth's surface, the potential energy increases by

If an object is in uniform circular motion, it has a constant_______ but a changing______.

An ideal gas has volume v ai 27'C .it is heated at constant pressure .so that, it's volume becomes 2v .The final temperature is

A cylinder rolling down the incline without slipping is an example of___.

The picture shows a bucket being whirled around in a circle (neglect gravity). Think about the correlation between this action and the motion of the moon around the earth. Then pick out the incorrect statement.

When do you generally use a mirror?

Question 30How does refraction takes place in the atmosphere? Why do stars twinkle but not the planets?

Question 14 A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity.

What is the force on a current-carrying wire that is parallel to a magnetic field ? Give reason for your answer.

A submarine sends out ultrasound and is detected after 3.425 s. If the speed of ultrasound in seawater is 1531 m/s, what is the distance of seabed from the submarine?

3. The focal length of the lens of (n= 1.5) in air is 10cm. If air is replaced by water of n=1.33,its focal length is

A piece of iron of mass 2.0 kg has a thermal capacity of 966 J/0C. Find: (i) Heat energy needed to warm it by 150C, and (ii) Its specific heat capacity in SI unit

9 calculate the glancing angle of a cube(1,0,0) of a rock salt(a=2.814 angstrom) corresponding to second order diffraction maximum for x-rays of wavelength 0.710 angstrom

Magnetic field of a conducting loop is B=0.2sin300t. Angle between area vector and B is 60^°. Area is 5 cm2 . Find maximum emf of loop

If a lense is sunk into water then its focal length will changewhy??

Two positively charged particles each of mass1.7×10-27 kg and each carrying a charge 1.6×10-19C are placed r dis†an ce apart .If each experiences s repulsive force equal to its weight ten find r

15. If speed of light is 3.0 100000000m/s calculate the distance covered by light in 2.00 ns

a resistor of 8 ohm is connected in parallel with another resistor X .the resultant resistance of combination is 9.8 ohm. what is value of resistance X

What is the mass and volume of all the planets?

A free body is acted upon by two unequal forces in opposite directions, but not in one line. The effect is that

An object is placed perpendicular to the principal axis of a lens of focal length f at a distance of 20 cm from the lens which produces an image at a distance 12 cm on the same side of the object in front of the lens. Find the focal length of the lens and state the type of lens. [4 MARKS]

Both Sun and a Star have Helium and Hydrogen but the sun light is yellow or orange and the star light is white. Why?

A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is

Question 12An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.

State 5 differences between refraction by glass prism and glass slab. (Note:In TABULAR form)

7.A voltmeter has a range 0-V with a series resistance R. With a series resistance 2R , the range is 0-V' is (1)V'=2V (2) V'>2V (3)V'>>2V (4) V'

A battery of 9 V is connected in series with resistors of 0.2Ω,0.3Ω,0.4Ω,0.5Ωand12Ω. How much current would flow through the 12Ω resistor?

14. 3 to the power 98 when divided by 5 what is the remainder??

Two different wires, whose specific resistance are inthe ratio 2 : 3, length 3 4 and radius of cross-section 1:2. The ratio of their resistances is

a) Explain the shining of an air bubble in water. b) A convex lens forms an image of the same size as the object at a distance of 30 cm from the lens. What is the distance of the object from the lens? What is the power of the lens? [5 MARKS]

A magnetic needle show a deflection when brought close to a current-carrying conductor because

What will be the radius of 64Cu nucleus if the radius of 27Al Al nucleus is RAl ?

If an object is in uniform circular motion, it has a constant_ but a changing.