50278 + Interview Questions in Physics

1.	A man is slipping on a frictionless inclined plane and a bag falls down from the same height. Then the time taken for both to reach the bottom is related as
Answer» A man is slipping on a frictionless inclined plane and a bag falls down from the same height. Then the time taken for both to reach the bottom is related as

Discussion

2.	Four particles A, B, C and D with masses ma=m, mB=2m, mC=3m and mD=4m are at the corners of a square. They have accelerations of equal magnitude with directions as shown in the figure. The acceleration of centre of mass of the particles (in ms−2) is :
Answer» Four particles $A$ , $B$ , $C$ and $D$ with masses $m_{a} = m, m_{B} = 2 m, m_{C} = 3 m$ and $m_{D} = 4 m$ are at the corners of a square. They have accelerations of equal magnitude with directions as shown in the figure. The acceleration of centre of mass of the particles (in ${ms}^{- 2}$ ) is :

Discussion

3.	In Davisson-German experiment, observed value of de-Broglie’s wavelength is 0.165 nm whereas theoretical value is 0.166 nm. Choose the correct reason for lower experimental value.
Answer» In Davisson-German experiment, observed value of de-Broglie’s wavelength is 0.165 $n m$ whereas theoretical value is 0.166 $n m$ . Choose the correct reason for lower experimental value.

Discussion

4.	in a particular system the unit of length, mass and time is to be 10cm ,10g and 0.1s so the unit of force in this system will be equivalent to ?
Answer» in a particular system the unit of length, mass and time is to be 10cm ,10g and 0.1s so the unit of force in this system will be equivalent to ?

Discussion

5.	EET & AIIMSparallel platarallel plate capacitor is charged to 60 uC. Due to a radioactive source, theA Pa x 108 Cs-1. The magnitude of displacement current isElectromagnetic Waves 255of 1.8 X(1) 3.610-8 Cs-1(3) 4.1 x 10-11 Cs-(2) 1.8 x 10-8 Cs1(4) 5.7 x 10-12 Cs-1
Answer» EET & AIIMSparallel platarallel plate capacitor is charged to 60 uC. Due to a radioactive source, theA Pa x 108 Cs-1. The magnitude of displacement current isElectromagnetic Waves 255of 1.8 X(1) 3.610-8 Cs-1(3) 4.1 x 10-11 Cs-(2) 1.8 x 10-8 Cs1(4) 5.7 x 10-12 Cs-1

Discussion

6.	In the circuit shown in the figure. The coil has inductance L and resistance R. When point X is joined to Y, the time constant is τ during the growth of current. When the steady state is reached, heat is produced in the coil at a rate of P. Now, point X is joined to Z, then, the total heat produced when current in the circuit reduced to zero is
Answer» In the circuit shown in the figure. The coil has inductance $L$ and resistance $R$ . When point $X$ is joined to $Y$ , the time constant is $τ$ during the growth of current. When the steady state is reached, heat is produced in the coil at a rate of $P$ . Now, point $X$ is joined to $Z$ , then, the total heat produced when current in the circuit reduced to zero is

Discussion

7.	A ball is allowed to fall from rest from height h. If it travels 9/25th of total height in the last second of its fall then ball will hit ground will hit ground with speed (g=10m/s2)A:30ms B:35msC: 45ms D: 50ms
Answer» A ball is allowed to fall from rest from height h. If it travels 9/25th of total height in the last second of its fall then ball will hit ground will hit ground with speed (g=10m/s2) A:30ms B:35ms C: 45ms D: 50ms

Discussion

8.	A proton of energy 100eV is moving perpendicular to a magnetic field of 10−4 T. The cyclotron frequency of the proton in rad /sec is:
Answer» A proton of energy $100 eV$ is moving perpendicular to a magnetic field of $10^{- 4} T$ . The cyclotron frequency of the proton in $rad /sec$ is:

Discussion

9.	derive the relation between force and acceleration.
Answer» derive the relation between force and acceleration.

Discussion

10.	A cylinder of height H is filled with water to a height h0(<H), and is placed on a horizontal floor. Two small holes are punched at time t=0 on the vertical line along the length of the cylinder, one at a height h1 from the bottom & the other a depth h2, below the level of water in the cylinder. Find the relation between h0, h1 & h2 such that the instantaneous water jets emerging fall at the same point on the floor.
Answer» A cylinder of height $H$ is filled with water to a height $h_{0} (< H)$ , and is placed on a horizontal floor. Two small holes are punched at time $t = 0$ on the vertical line along the length of the cylinder, one at a height $h_{1}$ from the bottom & the other a depth $h_{2}$ , below the level of water in the cylinder. Find the relation between $h_{0}, h_{1}$ & $h_{2}$ such that the instantaneous water jets emerging fall at the same point on the floor.

Discussion

11.	A body is projected upwards with a velocity of 98 m/s. The second body is projected upwards with the same initial velocity but after 4 s. Both the bodies will meet after
Answer» A body is projected upwards with a velocity of $98 m / s$ . The second body is projected upwards with the same initial velocity but after $4 s$ . Both the bodies will meet after

Discussion

12.	A point object at 15 cm from a concave mirror of radius of curvature 20 cm is made to oscillate along the principal axis with amplitude 2 mm. The amplitude of its image will be
Answer» A point object at $15 cm$ from a concave mirror of radius of curvature $20 cm$ is made to oscillate along the principal axis with amplitude $2 mm .$ The amplitude of its image will be

Discussion

13.	why we take perpendicular dis†an ce in torque why we simply cannot call torque as multiplication of force and position vector. what is the significance of taking perpendicular dis†an ce
Answer» why we take perpendicular dis†an ce in torque why we simply cannot call torque as multiplication of force and position vector. what is the significance of taking perpendicular dis†an ce

Discussion

14.	An object 2.4 m in front of a lens forms a sharp image on a film 12 cm behind the lens. A glass plate 1 cm thick, of refractive index 1.50 is interposed between lens and film with its plane faces parallel to film. By what distance (from lens) in m should object be shifted to form a sharp image on film?
Answer» An object $2.4 m$ in front of a lens forms a sharp image on a film $12 cm$ behind the lens. A glass plate $1 cm$ thick, of refractive index $1.50$ is interposed between lens and film with its plane faces parallel to film. By what distance (from lens) in m should object be shifted to form a sharp image on film?

Discussion

15.	A piston filled with 0.04 moles of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0 oC. As it does so, it absorbs 208 J of heat. What will be the value of q and W respectively ?
Answer» A piston filled with $0.04$ moles of an ideal gas expands reversibly from $50.0 mL to 375 mL$ at a constant temperature of $37.0^{o} C$ . As it does so, it absorbs $208 J$ of heat. What will be the value of $q$ and $W$ respectively ?

Discussion

16.	A steel bar 200mm in diameter is turned at a feed of 0.25mm/rev with a depth of cut of 4mm. The rotational speed of the workpiece is 160rpm. The material removal rate in mm3/s is
Answer» A steel bar $200 m m$ in diameter is turned at a feed of $0.25 m m / r e v$ with a depth of cut of $4 m m$ . The rotational speed of the workpiece is $160 r p m$ . The material removal rate in $m m^{3} / s$ is

Discussion

17.	Calculate the rms speed of nitrogen at STP (pressure = 1 atm and temperature = 0∘C). The density of nitrogen in these conditions is 1.25 kg m−3.
Answer» Calculate the rms speed of nitrogen at STP (pressure = 1 atm and temperature = $0^{\circ} C$ ). The density of nitrogen in these conditions is $1.25 k g m^{- 3}$ .

Discussion

18.	In the following figure, the separation between the plates 2d=7 mm, plate area A=56 cm2 and dielectric constant k=10. If the emf of the battery connected is 1 kV, then the charge on the capacitor is (in nC) (Take ϵo=9×10−12 F/m)
Answer» In the following figure, the separation between the plates $2 d = 7 mm$ , plate area $A = 56 {cm}^{2}$ and dielectric constant $k = 10$ . If the emf of the battery connected is $1 kV$ , then the charge on the capacitor is (in $nC$ ) $($ Take $ϵ_{o} = 9 \times 10^{- 12} F/m)$

Discussion

19.	Dalton's atomic theor
Answer» Dalton's atomic theor

Discussion

20.	A rubber band of natural length 1 m (stiffness k=22 Nm−1) is attached to a fixed point ′A′, while the other end is attached to a particle of mass 0.5 kg . The maximum downward velocity that can be given to the particle, so that it does not hit the floor is (in m/s).(Assume Hooke's law is valid even for larger deformation and ignore loss of energy due to jerk)
Answer» A rubber band of natural length $1 m$ (stiffness $k = 22 {Nm}^{- 1}$ ) is attached to a fixed point $^{'} A^{'}$ , while the other end is attached to a particle of mass $0.5 kg$ . The maximum downward velocity that can be given to the particle, so that it does not hit the floor is $(in m/s)$ . (Assume Hooke's law is valid even for larger deformation and ignore loss of energy due to jerk)

Discussion

21.	A body is thrown vertically upward from the ground with speed 15 m/s and it reaches at the highest position at time t = 1 s. Assuming cons†an t air drag, time taken by it to reach the ground from the highest point is nearly (g = 10 m/s2)
Answer» A body is thrown vertically upward from the ground with speed 15 m/s and it reaches at the highest position at time t = 1 s. Assuming cons†an t air drag, time taken by it to reach the ground from the highest point is nearly (g = 10 m/s2)

Discussion

22.	The half-life of Au198 is 2.7 days. The activity of 1.50 mg of Au198, if its atomic weight is 198 g mol−1is:(NA=6×1023/mol).
Answer» The half-life of $A u^{198}$ is $2.7$ days. The activity of $1.50 mg$ of $A u^{198}$ , if its atomic weight is $198 {g mol}^{- 1}$ is: $(N_{A} = 6 \times 10^{23} / mol)$ .

Discussion

23.	A straight conducting rod of length 2 m is moved with a speed of 2 m/s in a uniform magnetic field of magnitude 10 T. The maximum induced emf across the ends of the rod can be[0.77 Mark]
Answer» A straight conducting rod of length $2 m$ is moved with a speed of $2 m/s$ in a uniform magnetic field of magnitude $10 T .$ The maximum induced emf across the ends of the rod can be $[$ 0.77 Mark $]$

Discussion

24.	Distance travelled by a particle at any instant t can be represented as S=A(t+B)+Ct2. The dimensions of B are
Answer» Distance travelled by a particle at any instant $t$ can be represented as $S = A (t + B) + C t^{2}$ . The dimensions of $B$ are

Discussion

25.	Volume of 1 equivalent O2 gas at STP is 22.4L 11.2L 5.6L 9.8L
Answer» Volume of 1 equivalent O2 gas at STP is 22.4L 11.2L 5.6L 9.8L

Discussion

26.	A train moving at a speed of 30 m/s has just completed a U-curve in a semi-circular track. The engine is at the forward end of the semi-circular part of the track while the last carriage is at the rear end of the semi-circular track. The driver blows a whistle of frequency 200 Hz. If the velocity of sound is 340 m/s, then the apparent frequency as observed by a passenger in the middle of the train is
Answer» A train moving at a speed of $30 m/s$ has just completed a U-curve in a semi-circular track. The engine is at the forward end of the semi-circular part of the track while the last carriage is at the rear end of the semi-circular track. The driver blows a whistle of frequency $200 Hz$ . If the velocity of sound is $340 m/s$ , then the apparent frequency as observed by a passenger in the middle of the train is

Discussion

27.	Choose the correct option from (A), (B),(C) & (D)STATEMENT-1 : If instantaneous velocity of a particle is zero, then it can have instantaneous acceleration.STATEMENT-2 : Acceleration acting on a particle is independent of instantaneous state of the body.A) Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement-1B) Statement-1 is true, Statement-2 is true, Statement-2 is NOT a correct explanation for Statement-1C)Statement-1 is true but Statement-2 is falseD)Statement-1 is false but Statement-2 is true
Answer» Choose the correct option from (A), (B),(C) & (D) STATEMENT-1 : If instantaneous velocity of a particle is zero, then it can have instantaneous acceleration. STATEMENT-2 : Acceleration acting on a particle is independent of instantaneous state of the body. A) Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement-1 B) Statement-1 is true, Statement-2 is true, Statement-2 is NOT a correct explanation for Statement-1 C)Statement-1 is true but Statement-2 is false D)Statement-1 is false but Statement-2 is true

Discussion

28.	what is the electric flux in hemisphere?
Answer» what is the electric flux in hemisphere?

Discussion

29.	Two blocks m1=4 kg and m2=2 kg are connected by a weightess rod on a plane having inclination of 37∘. The coefficient of dynamic friction for blocks m1 and m2 with the inclined plane is μ=0.2. Assumeμk=μs=0.2 and g=10 ms−2. Then the common acceleration of the two blocks and the tension in the rod will be:
Answer» Two blocks $m_{1} = 4 k g$ and $m_{2} = 2 k g$ are connected by a weightess rod on a plane having inclination of $37^{\circ}$ . The coefficient of dynamic friction for blocks $m_{1}$ and $m_{2}$ with the inclined plane is $μ = 0.2$ . Assume $μ_{k} = μ_{s} = 0.2$ and g=10 ${m s}^{- 2}$ . Then the common acceleration of the two blocks and the tension in the rod will be:

Discussion

30.	A stone tied to a string of length L is whirled in a vertical circle with the other end of the string at the centre. At a certain instant of time, the stone is at its lowest position, and has a speed u. The magnitude of the change in its velocity as it reaches a position where the string is horizontal is
Answer» A stone tied to a string of length L is whirled in a vertical circle with the other end of the string at the centre. At a certain instant of time, the stone is at its lowest position, and has a speed u. The magnitude of the change in its velocity as it reaches a position where the string is horizontal is

Discussion

31.	A slab of stone of area 0.34 m2 and thickness 10 cm is exposed on the lower face to steam at 100∘ C. A block of ice at 0∘ C rests on the upper face of the slab. In one hour, 3.6 kg of ice is melted. Assume that the heat loss from the sides is negligible. The latent heat of fusion of ice is 3.4×105 J kg−1. What is the thermal conductivity of the stone in units of Js−1m−1 ∘C−1?
Answer» A slab of stone of area 0.34 $m^{2}$ and thickness 10 cm is exposed on the lower face to steam at $100^{\circ} C$ . A block of ice at $0^{\circ} C$ rests on the upper face of the slab. In one hour, 3.6 kg of ice is melted. Assume that the heat loss from the sides is negligible. The latent heat of fusion of ice is $3.4 \times 10^{5} J k g^{- 1}$ . What is the thermal conductivity of the stone in units of $J s^{- 1} m^{- 1}^{\circ} C^{- 1}$ ?

Discussion

32.	33. A thin iron ring with mean diameter , d 50 cm . support a winding consisting of 800 turns, with current 3A. The ring has a cross-cut of width 2.0 mm. The permeability iron is (graph between B and H is given by
Answer» 33. A thin iron ring with mean diameter , d 50 cm . support a winding consisting of 800 turns, with current 3A. The ring has a cross-cut of width 2.0 mm. The permeability iron is (graph between B and H is given by

Discussion

33.	A circular race track of radius 120 m is banked atan angle of 53^° . The optimum speed of car to avoidwear and tear of its tyres is (g = 10 ms-2)
Answer» A circular race track of radius 120 m is banked atan angle of 53^° . The optimum speed of car to avoidwear and tear of its tyres is (g = 10 ms-2)

Discussion

34.	a particle of mass m is projected with velocity v making angle 45 with horizontal when the paetivle lands on the level of ground the magnitude of the change in its momentum will be
Answer» a particle of mass m is projected with velocity v making angle 45 with horizontal when the paetivle lands on the level of ground the magnitude of the change in its momentum will be

Discussion

35.	What is the correct definition of Surface Tension?
Answer» What is the correct definition of Surface Tension?

Discussion

36.	The coefficient of volumetric expansion of mercury is 18×10−5/o C. A thermometer bulb has a volume 10−6 m3 and cross section of stem is 0.004 cm2. Assuming that bulb is filled with mercury at 0ºC then the length of the mercury column at 100ºC is
Answer» The coefficient of volumetric expansion of mercury is $18 \times 10^{- 5} /^{o} C$ . A thermometer bulb has a volume $10^{- 6} m^{3}$ and cross section of stem is $0.004 c m^{2}$ . Assuming that bulb is filled with mercury at 0ºC then the length of the mercury column at 100ºC is

36.

The coefficient of volumetric expansion of mercury is 18×10−5/o C. A thermometer bulb has a volume 10−6 m3 and cross section of stem is 0.004 cm2. Assuming that bulb is filled with mercury at 0ºC then the length of the mercury column at 100ºC is

Answer»

The coefficient of volumetric expansion of mercury is $18 \times 10^{- 5} /^{o} C$ . A thermometer bulb has a volume $10^{- 6} m^{3}$ and cross section of stem is $0.004 c m^{2}$ . Assuming that bulb is filled with mercury at 0ºC then the length of the mercury column at 100ºC is

Discussion

37.	24. Calculate the wavelength of moving object 'X' so that its momentum is four times that of the moving objectZ having wavelength 2.6 x 10-10 m.
Answer» 24. Calculate the wavelength of moving object 'X' so that its momentum is four times that of the moving objectZ having wavelength 2.6 x 10-10 m.

Discussion

38.	System is shown in the figure. Assume that cylinder remains in contact with the two wedges. The velocity of cylinder is
Answer» System is shown in the figure. Assume that cylinder remains in contact with the two wedges. The velocity of cylinder is

Discussion

39.	Two identical parallel plate capacitors A and B are connected to battery of V volts with the switch S closed. The switch is now opened and the free space between the plates of the capacitors is filled with a dielectric of dielectric constant K. Find the ratio of the total electrostatic energy stored in both capacitors before and after the introduction of the dielectric.
Answer» Two identical parallel plate capacitors A and B are connected to battery of V volts with the switch S closed. The switch is now opened and the free space between the plates of the capacitors is filled with a dielectric of dielectric constant K. Find the ratio of the total electrostatic energy stored in both capacitors before and after the introduction of the dielectric.

Discussion

40.	A spherical surface of radius 30 cm separates two transparent media A and B with refractive indices 1.33 and 1.48 respectively. The medium A is on the convex side of the surface. Where should a point object be placed in medium A so that the paraxial rays become parallel after refraction at the surface ?
Answer» A spherical surface of radius 30 cm separates two transparent media A and B with refractive indices 1.33 and 1.48 respectively. The medium A is on the convex side of the surface. Where should a point object be placed in medium A so that the paraxial rays become parallel after refraction at the surface ?

Discussion

41.	Find the magnitude of current in the following circuit
Answer» Find the magnitude of current in the following circuit

Discussion

42.	The internal reflection which occurs inside water droplet in case of rainbow is a total internal reflection , then how secondary rainbow is fainter than primary rainbow as no light is escaping from the drop by relection ? I have read that in TIR , there is no absorption of light ray by the surface and hence the intensity is same .
Answer» The internal reflection which occurs inside water droplet in case of rainbow is a total internal reflection , then how secondary rainbow is fainter than primary rainbow as no light is escaping from the drop by relection ? I have read that in TIR , there is no absorption of light ray by the surface and hence the intensity is same .

Discussion

43.	A golf ball has a mass of 40 g and a speed of 45 ms power _1 . if the speed can be measured within accuracy of 2% , calculate the in the position.
Answer» A golf ball has a mass of 40 g and a speed of 45 ms power _1 . if the speed can be measured within accuracy of 2% , calculate the in the position.

Discussion

44.	A bead of mass 10 g oscillates along the horizontal diameter AB of the ring of radius R=5 cm. At an instant shown in the figure, kinetic energy of the particle is 0.015 J. Find the force applied (in Newtons) by the ring on the bead.
Answer» A bead of mass $10 g$ oscillates along the horizontal diameter $A B$ of the ring of radius $R = 5 cm$ . At an instant shown in the figure, kinetic energy of the particle is $0.015 J$ . Find the force applied $(in Newtons)$ by the ring on the bead.

Discussion

45.	A capacitor of capacitance C is charged to a potential difference V from a cell and then disconnected from it. A charge +Q is now given to its positive plate. The potential difference across the capacitor is now1) V2) V + (Q/C)3) V + (Q/2C)4) V - (Q/C), if V < CV
Answer» A capacitor of capacitance C is charged to a potential difference V from a cell and then disconnected from it. A charge +Q is now given to its positive plate. The potential difference across the capacitor is now 1) V 2) V + (Q/C) 3) V + (Q/2C) 4) V - (Q/C), if V < CV

Discussion

46.	Two small spheres A and B are charged with +10 μC and +20 μC respectively and separated by a distance of 80 cm. The electric field point on the line joining the centers of two shapes will be zero at almost how much distance from A?
Answer» Two small spheres A and B are charged with +10 μC and +20 μC respectively and separated by a distance of 80 cm. The electric field point on the line joining the centers of two shapes will be zero at almost how much distance from A?

Discussion

47.	A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the resistor willhere why we are not considering P=IIR??why we are using P=VV/R
Answer» A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the resistor will here why we are not considering P=IIR?? why we are using P=VV/R

Discussion

48.	Draw a typical output characteristics of an n−p−n transistor in a CE configuration. Show how these characteristics can be used to determine output resistance.
Answer» Draw a typical output characteristics of an $n - p - n$ transistor in a $C E$ configuration. Show how these characteristics can be used to determine output resistance.

Discussion

49.	A bird is sitting in a large closed cage which is placed on a spring balance. It records a weight placed on a spring balance, It records a weight of 25 N. The bird (mass = 0.5kg) flies upward in the cage with an acceleration of 2m/s2. The spring balance will now record a weight of
Answer» A bird is sitting in a large closed cage which is placed on a spring balance. It records a weight placed on a spring balance, It records a weight of 25 N. The bird (mass = 0.5kg) flies upward in the cage with an acceleration of $2 m / s^{2}$ . The spring balance will now record a weight of

Discussion

50.	In the given circuit, all three capacitor are identical and have capacitance C μF each. Each resistor has resistance R Ω. An ideal cell of emf V volt is connected as shown. If potential difference across capacitor C3 in steady state is (ab)V, then value of a×b is:
Answer» In the given circuit, all three capacitor are identical and have capacitance $C μ F$ each. Each resistor has resistance $R Ω$ . An ideal cell of emf $V volt$ is connected as shown. If potential difference across capacitor $C_{3}$ in steady state is $(\frac{a}{b}) V$ , then value of $a \times b$ is:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A man is slipping on a frictionless inclined plane and a bag falls down from the same height. Then the time taken for both to reach the bottom is related as

Four particles A, B, C and D with masses ma=m, mB=2m, mC=3m and mD=4m are at the corners of a square. They have accelerations of equal magnitude with directions as shown in the figure. The acceleration of centre of mass of the particles (in ms−2) is :

In Davisson-German experiment, observed value of de-Broglie’s wavelength is 0.165 nm whereas theoretical value is 0.166 nm. Choose the correct reason for lower experimental value.

in a particular system the unit of length, mass and time is to be 10cm ,10g and 0.1s so the unit of force in this system will be equivalent to ?

EET & AIIMSparallel platarallel plate capacitor is charged to 60 uC. Due to a radioactive source, theA Pa x 108 Cs-1. The magnitude of displacement current isElectromagnetic Waves 255of 1.8 X(1) 3.610-8 Cs-1(3) 4.1 x 10-11 Cs-(2) 1.8 x 10-8 Cs1(4) 5.7 x 10-12 Cs-1

A ball is allowed to fall from rest from height h. If it travels 9/25th of total height in the last second of its fall then ball will hit ground will hit ground with speed (g=10m/s2)A:30ms B:35msC: 45ms D: 50ms

A proton of energy 100eV is moving perpendicular to a magnetic field of 10−4 T. The cyclotron frequency of the proton in rad /sec is:

derive the relation between force and acceleration.

A body is projected upwards with a velocity of 98 m/s. The second body is projected upwards with the same initial velocity but after 4 s. Both the bodies will meet after

A point object at 15 cm from a concave mirror of radius of curvature 20 cm is made to oscillate along the principal axis with amplitude 2 mm. The amplitude of its image will be

why we take perpendicular dis†an ce in torque why we simply cannot call torque as multiplication of force and position vector. what is the significance of taking perpendicular dis†an ce

A piston filled with 0.04 moles of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0 oC. As it does so, it absorbs 208 J of heat. What will be the value of q and W respectively ?

​​​​​A steel bar 200mm in diameter is turned at a feed of 0.25mm/rev with a depth of cut of 4mm. The rotational speed of the workpiece is 160rpm. The material removal rate in mm3/s is

Calculate the rms speed of nitrogen at STP (pressure = 1 atm and temperature = 0∘C). The density of nitrogen in these conditions is 1.25 kg m−3.

In the following figure, the separation between the plates 2d=7 mm, plate area A=56 cm2 and dielectric constant k=10. If the emf of the battery connected is 1 kV, then the charge on the capacitor is (in nC) (Take ϵo=9×10−12 F/m)

Dalton's atomic theor

A body is thrown vertically upward from the ground with speed 15 m/s and it reaches at the highest position at time t = 1 s. Assuming cons†an t air drag, time taken by it to reach the ground from the highest point is nearly (g = 10 m/s2)

The half-life of Au198 is 2.7 days. The activity of 1.50 mg of Au198, if its atomic weight is 198 g mol−1is:(NA=6×1023/mol).

A straight conducting rod of length 2 m is moved with a speed of 2 m/s in a uniform magnetic field of magnitude 10 T. The maximum induced emf across the ends of the rod can be[0.77 Mark]

Distance travelled by a particle at any instant t can be represented as S=A(t+B)+Ct2. The dimensions of B are

Volume of 1 equivalent O2 gas at STP is 22.4L 11.2L 5.6L 9.8L

what is the electric flux in hemisphere?

33. A thin iron ring with mean diameter , d 50 cm . support a winding consisting of 800 turns, with current 3A. The ring has a cross-cut of width 2.0 mm. The permeability iron is (graph between B and H is given by

A circular race track of radius 120 m is banked atan angle of 53^° . The optimum speed of car to avoidwear and tear of its tyres is (g = 10 ms-2)

a particle of mass m is projected with velocity v making angle 45 with horizontal when the paetivle lands on the level of ground the magnitude of the change in its momentum will be

What is the correct definition of Surface Tension?

The coefficient of volumetric expansion of mercury is 18×10−5/o C. A thermometer bulb has a volume 10−6 m3 and cross section of stem is 0.004 cm2. Assuming that bulb is filled with mercury at 0ºC then the length of the mercury column at 100ºC is

24. Calculate the wavelength of moving object 'X' so that its momentum is four times that of the moving objectZ having wavelength 2.6 x 10-10 m.

System is shown in the figure. Assume that cylinder remains in contact with the two wedges. The velocity of cylinder is

Find the magnitude of current in the following circuit

A golf ball has a mass of 40 g and a speed of 45 ms power _1 . if the speed can be measured within accuracy of 2% , calculate the in the position.

A bead of mass 10 g oscillates along the horizontal diameter AB of the ring of radius R=5 cm. At an instant shown in the figure, kinetic energy of the particle is 0.015 J. Find the force applied (in Newtons) by the ring on the bead.

A capacitor of capacitance C is charged to a potential difference V from a cell and then disconnected from it. A charge +Q is now given to its positive plate. The potential difference across the capacitor is now1) V2) V + (Q/C)3) V + (Q/2C)4) V - (Q/C), if V < CV

Two small spheres A and B are charged with +10 μC and +20 μC respectively and separated by a distance of 80 cm. The electric field point on the line joining the centers of two shapes will be zero at almost how much distance from A?

A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the resistor willhere why we are not considering P=IIR??why we are using P=VV/R

Draw a typical output characteristics of an n−p−n transistor in a CE configuration. Show how these characteristics can be used to determine output resistance.

A bird is sitting in a large closed cage which is placed on a spring balance. It records a weight placed on a spring balance, It records a weight of 25 N. The bird (mass = 0.5kg) flies upward in the cage with an acceleration of 2m/s2. The spring balance will now record a weight of

In the given circuit, all three capacitor are identical and have capacitance C μF each. Each resistor has resistance R Ω. An ideal cell of emf V volt is connected as shown. If potential difference across capacitor C3 in steady state is (ab)V, then value of a×b is:

A steel bar 200mm in diameter is turned at a feed of 0.25mm/rev with a depth of cut of 4mm. The rotational speed of the workpiece is 160rpm. The material removal rate in mm3/s is