50278 + Interview Questions in Physics

1.	There are two ADCs, bit digital ramp ADC and a 10 bit successive approximation ADC. If both utilize a 500kHz clock frequency, then ratio of conversion time of digital ramp ADC and successive approximation ADC is _______ 102.3
Answer» There are two ADCs, bit digital ramp ADC and a 10 bit successive approximation ADC. If both utilize a 500kHz clock frequency, then ratio of conversion time of digital ramp ADC and successive approximation ADC is _______ 102.3

Discussion

2.	A pulley fixed to the ceiling carries a string with blocks of mass m and 3 m attached to its ends. The masses of string and pulley are negligible. When the system is released, its centre of mass moves with what acceleration
Answer» A pulley fixed to the ceiling carries a string with blocks of mass m and 3 m attached to its ends. The masses of string and pulley are negligible. When the system is released, its centre of mass moves with what acceleration

Discussion

3.	A Kelvin thermometer and a Fahrenheit thermometer used to record temperature of a melting metal are showing the same reading. What will a Celsius thermometer read at that temperature?
Answer» A Kelvin thermometer and a Fahrenheit thermometer used to record temperature of a melting metal are showing the same reading. What will a Celsius thermometer read at that temperature?

Discussion

4.	A single riveted lap joint of two similar plates as shown in the figure below has the following geometrical and material details. width of the plate w=200 mm, thickness of the plate t=5 mm, number of rivets n=3, diameter of the rivet dr=10 mm, diameter of the rivet hole dn=11 mm, allowable tensile stress of the plate σp=200 MPa, allowable shear stress of the rivet σs=100 MPa and allowable bearing stress of the rivet σc=150 MPa.If the rivets are to be designed to avoid crushing failure, the maximum permissible loadP in kN is
Answer» A single riveted lap joint of two similar plates as shown in the figure below has the following geometrical and material details. width of the plate $w = 200 m m,$ thickness of the plate $t = 5 m m$ , number of rivets $n = 3$ , diameter of the rivet $d_{r} = 10 m m$ , diameter of the rivet hole $d_{n} = 11 m m$ , allowable tensile stress of the plate $σ_{p} = 200 M P a$ , allowable shear stress of the rivet $σ_{s} = 100 M P a$ and allowable bearing stress of the rivet $σ_{c} = 150 M P a$ . If the rivets are to be designed to avoid crushing failure, the maximum permissible load $P$ in $k N$ is

Discussion

5.	18.An object is given at initial velocity of 25/4 m/s and then it is decelerated at a rate given by dv/dt=-5/2v in si units. the time taken by paricle to come to rest is
Answer» 18.An object is given at initial velocity of 25/4 m/s and then it is decelerated at a rate given by dv/dt=-5/2v in si units. the time taken by paricle to come to rest is

Discussion

6.	A thin, smooth rod of length L and mass M is rotating freely with angular speed ω0 about an axis perpendicular to the rod and passing through its centre. Two beads of mass m and negligible size are at the centre of the rod initially. The beads are free to slide along the rod. The angular speed of the system, when the beads reach the opposite ends of the rod, will be
Answer» A thin, smooth rod of length $L$ and mass $M$ is rotating freely with angular speed $ω_{0}$ about an axis perpendicular to the rod and passing through its centre. Two beads of mass $m$ and negligible size are at the centre of the rod initially. The beads are free to slide along the rod. The angular speed of the system, when the beads reach the opposite ends of the rod, will be

Discussion

7.	A wave moving in a gas
Answer» A wave moving in a gas

Discussion

8.	The light ray is incident at an angle of 60∘ on a prism of angle 45∘. When the light ray falls on the other surface at 90∘, the refractive index of the material of prism μ and the angle of deviation δ are given by
Answer» The light ray is incident at an angle of $60^{\circ}$ on a prism of angle $45^{\circ}$ . When the light ray falls on the other surface at $90^{\circ}$ , the refractive index of the material of prism $μ$ and the angle of deviation $δ$ are given by

Discussion

9.	A shell of mass m moving with velocity v suddenly breaks into 2 pieces. The part having mass m4 remains stationary. The velocity of the other part will be:
Answer» A shell of mass $m$ moving with velocity $v$ suddenly breaks into 2 pieces. The part having mass $\frac{m}{4}$ remains stationary. The velocity of the other part will be:

Discussion

10.	98. A train 1 moves from east to west (clockwise) and another train 2 moves from wast to east (anticlockwise) on the equater with equal speed relative to ground. Then give a relation between centripital acceleration of train 1 and train 2 relative to center of earth.
Answer» 98. A train 1 moves from east to west (clockwise) and another train 2 moves from wast to east (anticlockwise) on the equater with equal speed relative to ground. Then give a relation between centripital acceleration of train 1 and train 2 relative to center of earth.

Discussion

11.	how many spectral lines are seen for hydrogen atom when electron jump from n=5 to n= 1 in visible region?
Answer» how many spectral lines are seen for hydrogen atom when electron jump from n=5 to n= 1 in visible region?

Discussion

12.	Two buildings A and B are 20 m apart. Building A has a window at a height of 50 m above the ground, and building B has a window at height 30 m from the ground. At what speed must a man throw a ball horizontally from the window of building A so that it enters the window of building B. Take g=10 m/s2.
Answer» Two buildings $A$ and $B$ are $20 m$ apart. Building $A$ has a window at a height of $50 m$ above the ground, and building $B$ has a window at height $30 m$ from the ground. At what speed must a man throw a ball horizontally from the window of building $A$ so that it enters the window of building $B$ . Take $g = 10 {m/s}^{2}$ .

Discussion

13.	15.: How to calculate gravitational potential graph ?
Answer» 15.: How to calculate gravitational potential graph ?

Discussion

14.	An 8m span propped cantilever beam ABC with an internal hinge at 'B' is shown in figure. A series of concentrated loads as shown crosses the beam from 'A' to 'C', the magnitude of maximum bending moment developed at fixed end 'A' (in kN-m. upto two decimals) is______ 700
Answer» An 8m span propped cantilever beam ABC with an internal hinge at 'B' is shown in figure. A series of concentrated loads as shown crosses the beam from 'A' to 'C', the magnitude of maximum bending moment developed at fixed end 'A' (in kN-m. upto two decimals) is______ 700

Discussion

15.	Why cannot a conservative force form a closed loop?
Answer» Why cannot a conservative force form a closed loop?

Discussion

16.	When the length of a microscope tube increases, its magnifying power [MNR 1986]
Answer» When the length of a microscope tube increases, its magnifying power [MNR 1986]

Discussion

17.	How many words each containing 2 vowels and 3 consonants can be formed with 5 vowels and 17 consonants? WITH REASON
Answer» How many words each containing 2 vowels and 3 consonants can be formed with 5 vowels and 17 consonants? WITH REASON

Discussion

18.	A tunnel is dug along the diameter of the earth. Two balls of mass m and 2m are dropped from the opposite ends of the tunnel simultaneously. They collide in the tunnel and stick to each other. If the new amplitude of their oscillation is Rn where R is earth's radius, then the value of n is
Answer» A tunnel is dug along the diameter of the earth. Two balls of mass $m$ and $2 m$ are dropped from the opposite ends of the tunnel simultaneously. They collide in the tunnel and stick to each other. If the new amplitude of their oscillation is $\frac{R}{n}$ where $R$ is earth's radius, then the value of $n$ is

Discussion

19.	two particles move in concentric circles of radii r1 ,r2 suxh that they maintain a staright line through the centre .find ratio of angular velocities
Answer» two particles move in concentric circles of radii r1 ,r2 suxh that they maintain a staright line through the centre .find ratio of angular velocities

Discussion

20.	Th resis†an ces in the two arms of the metre bridge are 5 ohm and R ohm respectively. When the resis†an ce is shunted with an equal resis†an ce, the new balance point is at 1.6 l_1. The resis†an ce R is?
Answer» Th resis†an ces in the two arms of the metre bridge are 5 ohm and R ohm respectively. When the resis†an ce is shunted with an equal resis†an ce, the new balance point is at 1.6 l_1. The resis†an ce R is?

Discussion

21.	Derive kinematic equation for uniform motion
Answer» Derive kinematic equation for uniform motion

Discussion

22.	2000 V−200 V,20 kVA transformers have 66 turns in the secondary winding. If IP and IS represents primary and secondary full-load current respectively, then : (Neglect the power losses in the transformer)
Answer» $2000 V - 200 V, 20 kVA$ transformers have $66$ turns in the secondary winding. If $I_{P}$ and $I_{S}$ represents primary and secondary full-load current respectively, then : (Neglect the power losses in the transformer)

Discussion

23.	Which of following can not be polarised [Kerala PMT 2001]
Answer» Which of following can not be polarised [Kerala PMT 2001]

23.

Which of following can not be polarised [Kerala PMT 2001]

Answer»

Which of following can not be polarised

[Kerala PMT 2001]

Discussion

24.	Two balls are projected vertically upward simultaneously with speeds 40 m/s and 60 m/s . Relative position (x) of second ball w.r.t first ball at time 5 sec is ?
Answer» Two balls are projected vertically upward simultaneously with speeds 40 m/s and 60 m/s . Relative position (x) of second ball w.r.t first ball at time 5 sec is ?

Discussion

25.	What charge is acquired by the glass rod when it is rubbed with a piece of silk?
Answer» What charge is acquired by the glass rod when it is rubbed with a piece of silk?

Discussion

26.	A force →F=−x^j acts on a particle. The particle starts from point (0,2) and moves to the point (1,4) following the path y=2x+2. The total work done by the force →F on the particle is
Answer» A force $\to F = - x^j$ acts on a particle. The particle starts from point $(0, 2)$ and moves to the point $(1, 4)$ following the path $y = 2 x + 2$ . The total work done by the force $\to F$ on the particle is

Discussion

27.	A ball of mass 10 kg is moving with a velocity of 10 m/s. It strikes another ball of mass 5 kg, which is moving in the same direction with a velocity of 4 m/s. If the collision is elastic, their respective velocities after the collision will be
Answer» A ball of mass $10 k g$ is moving with a velocity of $10 m / s$ . It strikes another ball of mass $5 k g$ , which is moving in the same direction with a velocity of $4 m / s$ . If the collision is elastic, their respective velocities after the collision will be

Discussion

28.	A block of mass m at the end of a string is whirled round in a vertical circle of radius R. The critical speed of the block at the top of its swing below which the string would slacken before the block reaches the top is
Answer» A block of mass m at the end of a string is whirled round in a vertical circle of radius R. The critical speed of the block at the top of its swing below which the string would slacken before the block reaches the top is

Discussion

29.	The graph shows position as a function of time for two trains A and B running on parallel tracks. For times greater than t = 0, which of the following statement is true?
Answer» The graph shows position as a function of time for two trains A and B running on parallel tracks. For times greater than t = 0, which of the following statement is true?

29.

The graph shows position as a function of time for two trains A and B running on parallel tracks. For times greater than t = 0, which of the following statement is true?

Answer»

The graph shows position as a function of time for two trains A and B running on parallel tracks. For times greater than t = 0, which of the following statement is true?

Discussion

30.	A magnet of magnetic moment (50^i) A - m2 is placed in a magnetic field, →B=(0.5^i+3.0^j) T. The torque acting on the magnet is
Answer» A magnet of magnetic moment $(50^i) {A - m}^{2}$ is placed in a magnetic field, $\to B = (0.5^i + 3.0^j) T$ . The torque acting on the magnet is

Discussion

31.	A point source emitting 628 lumen of luminous flux uniformly in all directions is placed at the origin. Calculate the illuminance on a small area placed at (1.0 m,0 0) in such a way that the normal to the area makes an angle of 37∘ with the X-axis
Answer» A point source emitting 628 lumen of luminous flux uniformly in all directions is placed at the origin. Calculate the illuminance on a small area placed at (1.0 m,0 0) in such a way that the normal to the area makes an angle of $37^{\circ}$ with the X-axis

Discussion

32.	In the product→F=q(→v×→B)=q→v×(B^i+B^j+B0^k)For q=1 and →v=2^i+4^j+6^k,→F=4^i−20^j+12^kWhat will be the complete expression for →B?
Answer» In the product $\to F = q (\to v \times \to B) = q \to v \times (B^i + B^j + B_{0}^k)$ For $q = 1$ and $\to v = 2^i + 4^j + 6^k$ , $\to F = 4^i - 20^j + 12^k$ What will be the complete expression for $\to B$ ?

Discussion

33.	Block A of mass 2 kg is placed over a block B of mass 8 kg. The combination is placed on a rough horizontal surface. If g 10 ms^2, coefficient of friction between B and floor 0.5,coefficient of friction between A and B= 0.4 and a horizontal force of 10 N is applied on 8 kg block, then calculate the force of friction between A and B
Answer» Block A of mass 2 kg is placed over a block B of mass 8 kg. The combination is placed on a rough horizontal surface. If g 10 ms^2, coefficient of friction between B and floor 0.5,coefficient of friction between A and B= 0.4 and a horizontal force of 10 N is applied on 8 kg block, then calculate the force of friction between A and B

Discussion

34.	A small air bubble is present exactly at the centre of a glass sphere. size of image as seen from outside is of
Answer» A small air bubble is present exactly at the centre of a glass sphere. size of image as seen from outside is of

Discussion

35.	The given four terminal network is part of a larger circuit. The points A,B,C are at the same potential. The potential difference between any one of A,B or C and D is 40 V. The potential difference between A and O is
Answer» The given four terminal network is part of a larger circuit. The points $A, B, C$ are at the same potential. The potential difference between any one of $A, B$ or $C$ and $D$ is $40 V$ . The potential difference between $A$ and $O$ is

Discussion

36.	A P-type semiconductor can be obtained by adding
Answer» A P-type semiconductor can be obtained by adding

Discussion

37.	when a series combination of induc†an ce and resis†an ce are connected with a10v,50Hz a.c source ,a current of 1A flows in the circuitb.the voltage leads the current by a phase angle of π/3 radian . calculate the valuesvof resis†an ce and inductive reac†an ce .
Answer» when a series combination of induc†an ce and resis†an ce are connected with a10v,50Hz a.c source ,a current of 1A flows in the circuitb.the voltage leads the current by a phase angle of π/3 radian . calculate the valuesvof resis†an ce and inductive reac†an ce .

Discussion

38.	There are two dipoles in space with dipole moment −→P1=ˆi+2ˆj+ˆk and −→P2=2ˆi−3ˆj+ˆk. What is the net dipole moment of the arrangement?
Answer» There are two dipoles in space with dipole moment $_{1} = ˆ i + 2 ˆ j + ˆ k$ $a n d$ $_{2} = 2 ˆ i - 3 ˆ j + ˆ k$ . What is the net dipole moment of the arrangement?

Discussion

39.	a body move in a straight line covers first half of the dis†an ce with speed 5m/s and second half ofbthe dis†an ce in two equal halves woth speed 4m/s and 3m/s respectively.Thebaverage velocity of the bodybis equal to
Answer» a body move in a straight line covers first half of the dis†an ce with speed 5m/s and second half ofbthe dis†an ce in two equal halves woth speed 4m/s and 3m/s respectively.Thebaverage velocity of the bodybis equal to

Discussion

40.	A projectile is thrown with a speed of 10√2 m/sat an angle of 450 with the horizontal. The Time interval betweenthe moments when its speed is √125m/s is (g = 10m/s2)
Answer» A projectile is thrown with a speed of 10√2 m/s at an angle of 45⁰ with the horizontal. The Time interval between the moments when its speed is √125m/s is (g = 10m/s²)

Discussion

41.	A double slit interference experiment is conducted with light waves of wavelength of 650 nm passing through two 3.0 μm slits that are 18 m apart Find out the minimum order of the bright fringe that would not be visible
Answer» A double slit interference experiment is conducted with light waves of wavelength of $650 nm$ passing through two $3.0 μ m$ slits that are $18 m$ apart Find out the minimum order of the bright fringe that would not be visible

Discussion

42.	If log102=0.3010 and log103=0.4771, then find the approximate value of log10192
Answer» If ${log}_{10} 2 = 0.3010$ and ${log}_{10} 3 = 0.4771$ , then find the approximate value of ${log}_{10} 192$

Discussion

43.	Why there is only two neutral point on the axis of bar magnet and infenite on the equatorial line
Answer» Why there is only two neutral point on the axis of bar magnet and infenite on the equatorial line

Discussion

44.	Evaluate ∫cos(−2x+3)dx
Answer» Evaluate $\int cos (- 2 x + 3) d x$

Discussion

45.	an object is placed in front of a concave mirror and it produces a real image of magnification 1.5.if the object distance is decreased by 5 the magnification of real image is increased to 4.find the focal length of the concave mirror
Answer» an object is placed in front of a concave mirror and it produces a real image of magnification 1.5.if the object distance is decreased by 5 the magnification of real image is increased to 4.find the focal length of the concave mirror

Discussion

46.	A source of sound of frequency 360 Hz is moving towards a stationary listener with speed v10 m/s, where speed of sound in still air is v. Then, the apparent frequency received by listener will be
Answer» A source of sound of frequency 360 Hz is moving towards a stationary listener with speed $\frac{v}{10} m / s$ , where speed of sound in still air is $v$ . Then, the apparent frequency received by listener will be

Discussion

47.	Two bodies, a ring and a solid cylinder of same material are rolling down without slipping an inclined plane. The radii of the bodies are same. The ratio of velocity of the centre of mass at the bottom of the inclined plane of the ring to that of the cylinder is √x2. Then, the value of x is _____.
Answer» Two bodies, a ring and a solid cylinder of same material are rolling down without slipping an inclined plane. The radii of the bodies are same. The ratio of velocity of the centre of mass at the bottom of the inclined plane of the ring to that of the cylinder is $\frac{\sqrt{x}}{2}$ . Then, the value of $x$ is _____.

Discussion

48.	1 S cm–1 is equal to
Answer» $1 S c m^{- 1}$ is equal to

Discussion

49.	A block of mass 2kg is placed on a fixed rough wedge with co efficient of friction =0.7 , angle of the icline is 30 degree .Find tension in the string
Answer» A block of mass 2kg is placed on a fixed rough wedge with co efficient of friction =0.7 , angle of the icline is 30 degree .Find tension in the string

Discussion

50.	11. IF AUFBAU principle is not maintained , then what will be the % change of the value (n+l) in the case of odd electrons , present in Mn (z=25) atom .
Answer» 11. IF AUFBAU principle is not maintained , then what will be the % change of the value (n+l) in the case of odd electrons , present in Mn (z=25) atom .

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

There are two ADCs, bit digital ramp ADC and a 10 bit successive approximation ADC. If both utilize a 500kHz clock frequency, then ratio of conversion time of digital ramp ADC and successive approximation ADC is _______ 102.3

A pulley fixed to the ceiling carries a string with blocks of mass m and 3 m attached to its ends. The masses of string and pulley are negligible. When the system is released, its centre of mass moves with what acceleration

A Kelvin thermometer and a Fahrenheit thermometer used to record temperature of a melting metal are showing the same reading. What will a Celsius thermometer read at that temperature?

18.An object is given at initial velocity of 25/4 m/s and then it is decelerated at a rate given by dv/dt=-5/2v in si units. the time taken by paricle to come to rest is

A wave moving in a gas

The light ray is incident at an angle of 60∘ on a prism of angle 45∘. When the light ray falls on the other surface at 90∘, the refractive index of the material of prism μ and the angle of deviation δ are given by

A shell of mass m moving with velocity v suddenly breaks into 2 pieces. The part having mass m4 remains stationary. The velocity of the other part will be:

98. A train 1 moves from east to west (clockwise) and another train 2 moves from wast to east (anticlockwise) on the equater with equal speed relative to ground. Then give a relation between centripital acceleration of train 1 and train 2 relative to center of earth.

how many spectral lines are seen for hydrogen atom when electron jump from n=5 to n= 1 in visible region?

15.: How to calculate gravitational potential graph ?

An 8m span propped cantilever beam ABC with an internal hinge at 'B' is shown in figure. A series of concentrated loads as shown crosses the beam from 'A' to 'C', the magnitude of maximum bending moment developed at fixed end 'A' (in kN-m. upto two decimals) is______ 700

Why cannot a conservative force form a closed loop?

When the length of a microscope tube increases, its magnifying power [MNR 1986]

How many words each containing 2 vowels and 3 consonants can be formed with 5 vowels and 17 consonants? WITH REASON

A tunnel is dug along the diameter of the earth. Two balls of mass m and 2m are dropped from the opposite ends of the tunnel simultaneously. They collide in the tunnel and stick to each other. If the new amplitude of their oscillation is Rn where R is earth's radius, then the value of n is

two particles move in concentric circles of radii r1 ,r2 suxh that they maintain a staright line through the centre .find ratio of angular velocities

Th resis†an ces in the two arms of the metre bridge are 5 ohm and R ohm respectively. When the resis†an ce is shunted with an equal resis†an ce, the new balance point is at 1.6 l_1. The resis†an ce R is?

Derive kinematic equation for uniform motion

2000 V−200 V,20 kVA transformers have 66 turns in the secondary winding. If IP and IS represents primary and secondary full-load current respectively, then : (Neglect the power losses in the transformer)

Which of following can not be polarised [Kerala PMT 2001]

Two balls are projected vertically upward simultaneously with speeds 40 m/s and 60 m/s . Relative position (x) of second ball w.r.t first ball at time 5 sec is ?

What charge is acquired by the glass rod when it is rubbed with a piece of silk?

A force →F=−x^j acts on a particle. The particle starts from point (0,2) and moves to the point (1,4) following the path y=2x+2. The total work done by the force →F on the particle is

A ball of mass 10 kg is moving with a velocity of 10 m/s. It strikes another ball of mass 5 kg, which is moving in the same direction with a velocity of 4 m/s. If the collision is elastic, their respective velocities after the collision will be

A block of mass m at the end of a string is whirled round in a vertical circle of radius R. The critical speed of the block at the top of its swing below which the string would slacken before the block reaches the top is

The graph shows position as a function of time for two trains A and B running on parallel tracks. For times greater than t = 0, which of the following statement is true?

A magnet of magnetic moment (50^i) A - m2 is placed in a magnetic field, →B=(0.5^i+3.0^j) T. The torque acting on the magnet is

A point source emitting 628 lumen of luminous flux uniformly in all directions is placed at the origin. Calculate the illuminance on a small area placed at (1.0 m,0 0) in such a way that the normal to the area makes an angle of 37∘ with the X-axis

In the product→F=q(→v×→B)=q→v×(B^i+B^j+B0^k)For q=1 and →v=2^i+4^j+6^k,→F=4^i−20^j+12^kWhat will be the complete expression for →B?

A small air bubble is present exactly at the centre of a glass sphere. size of image as seen from outside is of

The given four terminal network is part of a larger circuit. The points A,B,C are at the same potential. The potential difference between any one of A,B or C and D is 40 V. The potential difference between A and O is

A P-type semiconductor can be obtained by adding

when a series combination of induc†an ce and resis†an ce are connected with a10v,50Hz a.c source ,a current of 1A flows in the circuitb.the voltage leads the current by a phase angle of π/3 radian . calculate the valuesvof resis†an ce and inductive reac†an ce .

There are two dipoles in space with dipole moment −→P1=ˆi+2ˆj+ˆk and −→P2=2ˆi−3ˆj+ˆk. What is the net dipole moment of the arrangement?

a body move in a straight line covers first half of the dis†an ce with speed 5m/s and second half ofbthe dis†an ce in two equal halves woth speed 4m/s and 3m/s respectively.Thebaverage velocity of the bodybis equal to

A projectile is thrown with a speed of 10√2 m/sat an angle of 450 with the horizontal. The Time interval betweenthe moments when its speed is √125m/s is (g = 10m/s2)

A double slit interference experiment is conducted with light waves of wavelength of 650 nm passing through two 3.0 μm slits that are 18 m apart Find out the minimum order of the bright fringe that would not be visible

If log102=0.3010 and log103=0.4771, then find the approximate value of log10192

Why there is only two neutral point on the axis of bar magnet and infenite on the equatorial line

Evaluate ∫cos(−2x+3)dx

an object is placed in front of a concave mirror and it produces a real image of magnification 1.5.if the object distance is decreased by 5 the magnification of real image is increased to 4.find the focal length of the concave mirror

A source of sound of frequency 360 Hz is moving towards a stationary listener with speed v10 m/s, where speed of sound in still air is v. Then, the apparent frequency received by listener will be

1 S cm–1 is equal to

A block of mass 2kg is placed on a fixed rough wedge with co efficient of friction =0.7 , angle of the icline is 30 degree .Find tension in the string

11. IF AUFBAU principle is not maintained , then what will be the % change of the value (n+l) in the case of odd electrons , present in Mn (z=25) atom .