6277 + Interview Questions in Physics Page 37 InterviewSolution

1801.	A person is standing in front of a plane mirror. If the mirror recedes with velocity v, then the velocity of his image is
Answer» A person is standing in front of a plane mirror. If the mirror recedes with velocity $v$ , then the velocity of his image is

Discussion

1802.	18. two masses in the ratio of 1:4 have their speeds in the ratio of 4:5 find the ratio of their kinetic energy
Answer» 18. two masses in the ratio of 1:4 have their speeds in the ratio of 4:5 find the ratio of their kinetic energy

Discussion

1803.	among sulphur and phosphorus which has high catenation propert
Answer» among sulphur and phosphorus which has high catenation propert

Discussion

1804.	if a man walks 50m towrds east 40 towardnorth and 20 toward west ind magnitude of displacement
Answer» if a man walks 50m towrds east 40 towardnorth and 20 toward west ind magnitude of displacement

Discussion

1805.	Give reason for the statement One side of the iron girdles of bridge are placed on rollers?Why.
Answer» Give reason for the statement One side of the iron girdles of bridge are placed on rollers?Why.

1805.

Give reason for the statement One side of the iron girdles of bridge are placed on rollers?Why.

Answer»

Give reason for the statement

One side of the iron girdles of bridge are placed on rollers?Why.

Discussion

1806.	A totally reflecting small plane mirror placed horizontally faces a parallel beam of light as shown in figure. The mass of the mirror is 20 g. Assume that there is no absorption in the lens and that 30% of the light emitted by the source goes through the lens. The power of the source needed to support the weight of the mirror (in MW) is (Take g = 10 m/s2)
Answer» A totally reflecting small plane mirror placed horizontally faces a parallel beam of light as shown in figure. The mass of the mirror is $20 g$ . Assume that there is no absorption in the lens and that 30% of the light emitted by the source goes through the lens. The power of the source needed to support the weight of the mirror (in MW) is (Take g = 10 $m / s^{2}$ )

Discussion

1807.	the difference in lengths of a mean solar day and a sidereal dayis about
Answer» the difference in lengths of a mean solar day and a sidereal dayis about

Discussion

1808.	4.How the flow of electron is in the opposite direction of flow of electric current.
Answer» 4.How the flow of electron is in the opposite direction of flow of electric current.

Discussion

1809.	16.2 solid cylinders of mass m are connnected to each other with spring of constant k. if both cylinders are pulled apart and released they will oscillate with time period-
Answer» 16.2 solid cylinders of mass m are connnected to each other with spring of constant k. if both cylinders are pulled apart and released they will oscillate with time period-

Discussion

1810.	Why are wires of different materials and different lengths and thicknesses used?
Answer» Why are wires of different materials and different lengths and thicknesses used?

Discussion

1811.	Why is tungsten used for making filaments in an electric bulb?
Answer» Why is tungsten used for making filaments in an electric bulb?

Discussion

1812.	What are velocity, magnitude and acceleration?
Answer» What are velocity, magnitude and acceleration?

Discussion

1813.	Why does this happen? Take 2 balloons of approximately equal size.put a little water into the ballons.Blow up both the balloons and tie each one to a string.Hang them 8-10 cm apart on a stick.blow in the space between the ballons,THey moved towards each other. Ouestion:Why did the balloons moved towards each other on being blown?
Answer» Why does this happen? Take 2 balloons of approximately equal size.put a little water into the ballons.Blow up both the balloons and tie each one to a string.Hang them 8-10 cm apart on a stick.blow in the space between the ballons,THey moved towards each other. Ouestion:Why did the balloons moved towards each other on being blown?

Discussion

1814.	A cone of volume V and height h is converted into another cone of same height but with double area of base.The volume of new cone is kV the value of k i
Answer» A cone of volume V and height h is converted into another cone of same height but with double area of base.The volume of new cone is kV the value of k i

Discussion

1815.	Origin of electric charge in electrostatic
Answer» Origin of electric charge in electrostatic

Discussion

1816.	What energy conversion occurs in a torch?
Answer» What energy conversion occurs in a torch?

Discussion

1817.	Why is our forehead hot even if we are shivering with cold?
Answer» Why is our forehead hot even if we are shivering with cold?

Discussion

1818.	For a melting of NaCl heat required is 7.26kcal mol and Entropy change increased by 6.73 cal mol .the melting of the salt is
Answer» For a melting of NaCl heat required is 7.26kcal mol and Entropy change increased by 6.73 cal mol .the melting of the salt is

Discussion

1819.	What is the approximate peak value of an alternating current producing four times the heat produced per second by a steady current of 2A in a resistor
Answer» What is the approximate peak value of an alternating current producing four times the heat produced per second by a steady current of 2A in a resistor

Discussion

1820.	What would you do to see if the barber has cut your hair properly at the back?
Answer» What would you do to see if the barber has cut your hair properly at the back?

Discussion

1821.	27. If an object is at rest and placed in front of a mirror which is moving with speed v towards the object then what will be the speed of image ?
Answer» 27. If an object is at rest and placed in front of a mirror which is moving with speed v towards the object then what will be the speed of image ?

Discussion

1822.	Which of the following are types of motion:
Answer» Which of the following are types of motion:

Discussion

1823.	If a convex mirror is immersed in water then power of the mirror
Answer» If a convex mirror is immersed in water then power of the mirror

Discussion

1824.	An allotrope of a non-metal which conducts electricity among the following is:
Answer» An allotrope of a non-metal which conducts electricity among the following is:

Discussion

1825.	Question 3 (b) Fill in the blanks : (b) Temperature of boiling water cannot be measured by a ___ thermometer.
Answer» Question 3 (b) Fill in the blanks : (b) Temperature of boiling water cannot be measured by a ___ thermometer.

Discussion

1826.	What is refraction
Answer» What is refraction

Discussion

1827.	A crane uses a mysterious object ‘X’ to separate magnetic materials from junk. The object ‘X’ is most probably
Answer» A crane uses a mysterious object ‘X’ to separate magnetic materials from junk. The object ‘X’ is most probably

Discussion

1828.	28. Why solid expands
Answer» 28. Why solid expands

Discussion

1829.	a particle moves according to the equation t =\sqrt x +3 when will be the particle come to rest for the first tim
Answer» a particle moves according to the equation t =\sqrt x +3 when will be the particle come to rest for the first tim

Discussion

1830.	why is it so that the degree of freedom of vibrational motion in physics is 2 while in chemistry is 1
Answer» why is it so that the degree of freedom of vibrational motion in physics is 2 while in chemistry is 1

Discussion

1831.	The image of which of the following letters of the alphabet will be exactly the same when seen in a plane mirror: A E I O U
Answer» The image of which of the following letters of the alphabet will be exactly the same when seen in a plane mirror: A E I O U

Discussion

1832.	Convert 18 kmhr in ms.
Answer» $C o n v e r t 18 \frac{k m}{h r} i n \frac{m}{s}$ .

Discussion

1833.	Which of the pins will fall first?
Answer» Which of the pins will fall first?

Discussion

1834.	Discusswhy wearing more layers of clothing during winterskeeps us warmer than wearing just one thick piece of clothing.
Answer» Discuss why wearing more layers of clothing during winters keeps us warmer than wearing just one thick piece of clothing.

Discussion

1835.	A sound wave of wavelength 80 CM travels in air a pressure amplitude at a point is 1/210^-3Newton per metre square then maximum displacement of particle is bulk modulus equal to 1.4 10^ 5 Newton per metre square
Answer» A sound wave of wavelength 80 CM travels in air a pressure amplitude at a point is 1/210^-3Newton per metre square then maximum displacement of particle is bulk modulus equal to 1.4 10^ 5 Newton per metre square

Discussion

1836.	For the graph given below choose the correct option : TableATableBa)LineAi)Accelerated Motionb)LineBii)Constant velocity(high magnitude)c)CurveCiii)At restd)LineEiv)Constant Velocity(low magnitude)
Answer» For the graph given below choose the correct option : $\begin{matrix} T a b l e A & T a b l e B a) L i n e A & i) A c c e l e r a t e d M o t i o n b) L i n e B & i i) C o n s t a n t v e l o c i t y (h i g h m a g n i t u d e) c) C u r v e C & i i i) A t r e s t d) L i n e E & i v) C o n s t a n t V e l o c i t y (l o w m a g n i t u d e) \end{matrix}$

1836.

For the graph given below choose the correct option : TableATableBa)LineAi)Accelerated Motionb)LineBii)Constant velocity(high magnitude)c)CurveCiii)At restd)LineEiv)Constant Velocity(low magnitude)

Answer»

For the graph given below choose the correct option :

$\begin{matrix} T a b l e A & T a b l e B a) L i n e A & i) A c c e l e r a t e d M o t i o n b) L i n e B & i i) C o n s t a n t v e l o c i t y (h i g h m a g n i t u d e) c) C u r v e C & i i i) A t r e s t d) L i n e E & i v) C o n s t a n t V e l o c i t y (l o w m a g n i t u d e) \end{matrix}$

Discussion

1837.	A wall of thickness 10cm and height 5m has to be built across a play ground of length 15m. How many bricks are needed to construct the wall, if each brick has dimensions of 20cm×10cm×5cm.?[4 MARKS]
Answer» A wall of thickness $10 c m$ and height $5 m$ has to be built across a play ground of length $15 m$ . How many bricks are needed to construct the wall, if each brick has dimensions of $20 c m \times 10 c m \times 5 c m .$ ? [4 MARKS]

Discussion

1838.	Two pendulum bobs of mass M and 2M are released from same height H. If they collide inelastically at mean position then the height up to which the composite mass would rise is(The pendulum have same length and are tied a common point P)
Answer» Two pendulum bobs of mass M and 2M are released from same height H. If they collide inelastically at mean position then the height up to which the composite mass would rise is(The pendulum have same length and are tied a common point P)

Discussion

1839.	Light is incident from glass medium to air medium. The variation of the angle of deviation δ with the angle of incidence i for 0<i<90∘ is shown. The refractive index of glass is 2√3. If the value of (x+y+z) is nπ6 then find value of n_______.
Answer» Light is incident from glass medium to air medium. The variation of the angle of deviation $δ$ with the angle of incidence $i$ for $0 < i < 90^{\circ}$ is shown. The refractive index of glass is $\frac{2}{\sqrt{3}}$ . If the value of $(x + y + z)$ is $\frac{n π}{6}$ then find value of n_______.

Discussion

1840.	If the speed of a car is 20 ms−1, what is the speed in km h−1?72
Answer» If the speed of a car is $20 m s^{- 1}$ , what is the speed in $k m h^{- 1}$ ? 72

Discussion

1841.	Determine the final result when 200 gm of water and 20 gm at 0∘C are in a calorimeter having a water equivalent of 30 gm and 50 gm of steam is passed into it at 100∘C . Take latent heat of fusion 80 cal/gm and latent heat of vaporization as 540 cal/gm
Answer» Determine the final result when 200 gm of water and 20 gm at $0^{\circ} C$ are in a calorimeter having a water equivalent of 30 gm and 50 gm of steam is passed into it at $100^{\circ} C$ . Take latent heat of fusion 80 cal/gm and latent heat of vaporization as 540 cal/gm

Discussion

1842.	how many images are formed by two plane mirrors?
Answer» how many images are formed by two plane mirrors?

Discussion

1843.	Name the four different types of Galaxies.
Answer» Name the four different types of Galaxies.

Discussion

1844.	In a torch, we use ___ as a source of electricity.
Answer» In a torch, we use ___ as a source of electricity.

Discussion

1845.	A sound produced by the mixture of several frequencies is called______.
Answer» A sound produced by the mixture of several frequencies is called______.

Discussion

1846.	A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are (root of 3,3). The path of the particlemakes with the x-axis an angle of\lbrack AIPMT (Prelims)-2007\rbrack(1) 0(2) 30^° (3) 45^° (4) 60^°
Answer» A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are (root of 3,3). The path of the particlemakes with the x-axis an angle of\lbrack AIPMT (Prelims)-2007\rbrack(1) 0(2) 30^° (3) 45^° (4) 60^°

Discussion

1847.	A bar of uniform cross-section is hanging vertically as shown in figue. Specific weight of bar is γ and x is measured from free end. Then the graph of stress induced σ versus x due to self weight is
Answer» A bar of uniform cross-section is hanging vertically as shown in figue. Specific weight of bar is $γ$ and $x$ is measured from free end. Then the graph of stress induced $σ$ versus $x$ due to self weight is

Discussion

1848.	Which of the following is/are necessary for the formation of an image?
Answer» Which of the following is/are necessary for the formation of an image?

Discussion

1849.	Which of the following objects exerts the maximum pressure on the floor? (All objects have the same weight)
Answer» Which of the following objects exerts the maximum pressure on the floor? (All objects have the same weight)

Discussion

1850.	A concave mirror:
Answer» A concave mirror:

Discussion

Explore topic-wise InterviewSolutions in .

A person is standing in front of a plane mirror. If the mirror recedes with velocity v, then the velocity of his image is

18. two masses in the ratio of 1:4 have their speeds in the ratio of 4:5 find the ratio of their kinetic energy

among sulphur and phosphorus which has high catenation propert

if a man walks 50m towrds east 40 towardnorth and 20 toward west ind magnitude of displacement

Give reason for the statement One side of the iron girdles of bridge are placed on rollers?Why.

the difference in lengths of a mean solar day and a sidereal dayis about

4.How the flow of electron is in the opposite direction of flow of electric current.

16.2 solid cylinders of mass m are connnected to each other with spring of constant k. if both cylinders are pulled apart and released they will oscillate with time period-

Why are wires of different materials and different lengths and thicknesses used?

Why is tungsten used for making filaments in an electric bulb?

What are velocity, magnitude and acceleration?

A cone of volume V and height h is converted into another cone of same height but with double area of base.The volume of new cone is kV the value of k i

Origin of electric charge in electrostatic

What energy conversion occurs in a torch?

Why is our forehead hot even if we are shivering with cold?

For a melting of NaCl heat required is 7.26kcal mol and Entropy change increased by 6.73 cal mol .the melting of the salt is

What is the approximate peak value of an alternating current producing four times the heat produced per second by a steady current of 2A in a resistor

What would you do to see if the barber has cut your hair properly at the back?

27. If an object is at rest and placed in front of a mirror which is moving with speed v towards the object then what will be the speed of image ?

Which of the following are types of motion:

If a convex mirror is immersed in water then power of the mirror

An allotrope of a non-metal which conducts electricity among the following is:

Question 3 (b) Fill in the blanks : (b) Temperature of boiling water cannot be measured by a ___ thermometer.

What is refraction

A crane uses a mysterious object ‘X’ to separate magnetic materials from junk. The object ‘X’ is most probably

28. Why solid expands

a particle moves according to the equation t =\sqrt x +3 when will be the particle come to rest for the first tim

why is it so that the degree of freedom of vibrational motion in physics is 2 while in chemistry is 1

The image of which of the following letters of the alphabet will be exactly the same when seen in a plane mirror: A E I O U

Convert 18 kmhr in ms.

Which of the pins will fall first?

Discusswhy wearing more layers of clothing during winterskeeps us warmer than wearing just one thick piece of clothing.

A sound wave of wavelength 80 CM travels in air a pressure amplitude at a point is 1/2*10^-3Newton per metre square then maximum displacement of particle is bulk modulus equal to 1.4 * 10^ 5 Newton per metre square

For the graph given below choose the correct option : TableATableBa)LineAi)Accelerated Motionb)LineBii)Constant velocity(high magnitude)c)CurveCiii)At restd)LineEiv)Constant Velocity(low magnitude)

A wall of thickness 10cm and height 5m has to be built across a play ground of length 15m. How many bricks are needed to construct the wall, if each brick has dimensions of 20cm×10cm×5cm.?[4 MARKS]

Two pendulum bobs of mass M and 2M are released from same height H. If they collide inelastically at mean position then the height up to which the composite mass would rise is(The pendulum have same length and are tied a common point P)

Light is incident from glass medium to air medium. The variation of the angle of deviation δ with the angle of incidence i for 0&lt;i&lt;90∘ is shown. The refractive index of glass is 2√3. If the value of (x+y+z) is nπ6 then find value of n_______.

If the speed of a car is 20 ms−1, what is the speed in km h−1?72

Determine the final result when 200 gm of water and 20 gm at 0∘C are in a calorimeter having a water equivalent of 30 gm and 50 gm of steam is passed into it at 100∘C . Take latent heat of fusion 80 cal/gm and latent heat of vaporization as 540 cal/gm

how many images are formed by two plane mirrors?

Name the four different types of Galaxies.

In a torch, we use ___ as a source of electricity.

A sound produced by the mixture of several frequencies is called______.

A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are (root of 3,3). The path of the particlemakes with the x-axis an angle of\lbrack AIPMT (Prelims)-2007\rbrack(1) 0(2) 30^° (3) 45^° (4) 60^°

A bar of uniform cross-section is hanging vertically as shown in figue. Specific weight of bar is γ and x is measured from free end. Then the graph of stress induced σ versus x due to self weight is

Which of the following is/are necessary for the formation of an image?

Which of the following objects exerts the maximum pressure on the floor? (All objects have the same weight)

A concave mirror:

A sound wave of wavelength 80 CM travels in air a pressure amplitude at a point is 1/210^-3Newton per metre square then maximum displacement of particle is bulk modulus equal to 1.4 10^ 5 Newton per metre square

Light is incident from glass medium to air medium. The variation of the angle of deviation δ with the angle of incidence i for 0<i<90∘ is shown. The refractive index of glass is 2√3. If the value of (x+y+z) is nπ6 then find value of n_______.