50278 + Interview Questions in Physics

1.	A metallic rod of length l is tied to a string of length 2l and made to rotate with angular speed ω on a horizontal table with one end of the string fixed. If there is a vertical magnetic field B in the region, the emf induced across the ends of the rod is
Answer» A metallic rod of length l is tied to a string of length 2l and made to rotate with angular speed $ω$ on a horizontal table with one end of the string fixed. If there is a vertical magnetic field B in the region, the emf induced across the ends of the rod is

Discussion

2.	In a new system of units, called SHAR system, the unit of length is α m, the unit of mass is 1αkg kg and the unit of time is α2 s. The unit of work in this system is
Answer» In a new system of units, called SHAR system, the unit of length is $α$ m, the unit of mass is $\frac{1}{α} k g$ kg and the unit of time is $α^{2}$ s. The unit of work in this system is

Discussion

3.	A solid cone of height 2R and base radius R is placed over a solid hemisphere as shown in figure. Cone and hemisphere are made up of the same material. Height of center of mass of system from the ground is
Answer» A solid cone of height $2 R$ and base radius $R$ is placed over a solid hemisphere as shown in figure. Cone and hemisphere are made up of the same material. Height of center of mass of system from the ground is

Discussion

4.	A tuning fork of frequency 512 Hz is vibrated with a sonometer wire and 6 beats per second are heard. The beat frequency reduces if the tension in the string is slightly increased. The original frequency of vibration of the string is
Answer» A tuning fork of frequency $512 H z$ is vibrated with a sonometer wire and $6$ beats per second are heard. The beat frequency reduces if the tension in the string is slightly increased. The original frequency of vibration of the string is

Discussion

5.	A compound microscope has an eye piece of focal length 10 cm and an objective of focal length 4 cm. If an object is kept at a distance of 5 cm from the objective, so that the final image is formed at the least distance of distinct vision 20 cm, calculate the magnification.
Answer» A compound microscope has an eye piece of focal length $10 c m$ and an objective of focal length $4 c m$ . If an object is kept at a distance of $5 c m$ from the objective, so that the final image is formed at the least distance of distinct vision $20 c m$ , calculate the magnification.

Discussion

6.	Two point charges of magnitude q and 3q are located at a distance 'a' in dielectric medium of dielectric constant 2. The force applied by the larger charge 3q on dielectric is nq24πϵoa2. Here n is
Answer» Two point charges of magnitude q and 3q are located at a distance 'a' in dielectric medium of dielectric constant 2. The force applied by the larger charge 3q on dielectric is $\frac{n q^{2}}{4 π ϵ_{o} a^{2}} .$ Here n is

Discussion

7.	A uniform cord of length 6.0 m and 12.0 kg is shown in the figure with a block of 3.0 kg suspended from it. Find the speed of the pulse on the horizontal part of the cord.
Answer» A uniform cord of length 6.0 m and 12.0 kg is shown in the figure with a block of 3.0 kg suspended from it. Find the speed of the pulse on the horizontal part of the cord.

Discussion

8.	Suppose ideal gas equation follows VP3=constant. Initial temperature and volume of the gas are T and V respectively. If gas expand to 27V then its temperature will become
Answer» Suppose ideal gas equation follows $V P^{3} = c o n s t a n t$ . Initial temperature and volume of the gas are T and V respectively. If gas expand to 27V then its temperature will become

Discussion

9.	A wire of linear mass density 9×10–3 kg/m is stretched between two rigid supports under a tension of 360 N. The wire resonates at frequency 210 Hz. The next higher frequency at which the same wire resonates is 280 Hz. The number of loops produced in first case will be
Answer» A wire of linear mass density $9 \times 10^{- 3} kg/m$ is stretched between two rigid supports under a tension of $360 N$ . The wire resonates at frequency $210 Hz$ . The next higher frequency at which the same wire resonates is $280 Hz$ . The number of loops produced in first case will be

Discussion

10.	The thermal capacity of 100 g of aluminum (specific heat =0.2 cal/g∘C) is
Answer» The thermal capacity of $100 g$ of aluminum (specific heat $= 0.2 {cal/g}^{\circ} C)$ is

Discussion

11.	A horizontal force F acts on a sphere of mass M at its centre. Coefficient of friction between the ground and sphere is μ. Let the maximum force F for which there is no slipping be n2μMg. Find n.
Answer» A horizontal force $F$ acts on a sphere of mass $M$ at its centre. Coefficient of friction between the ground and sphere is $μ$ . Let the maximum force $F$ for which there is no slipping be $\frac{n}{2} μ M g$ . Find $n$ .

Discussion

12.	In the system shown in the figure, the string, springs and pulley are weightless. The force constants of the two springs are k1=k and k2=2k. Block of mass M is pulled vertically down from its equilibrium position and released. Calculate the angular frequency of oscillation. [Assume the top surface of the block (represented by line AB) always remains horizontal]
Answer» In the system shown in the figure, the string, springs and pulley are weightless. The force constants of the two springs are $k_{1} = k$ and $k_{2} = 2 k$ . Block of mass $M$ is pulled vertically down from its equilibrium position and released. Calculate the angular frequency of oscillation. [Assume the top surface of the block (represented by line $A B$ ) always remains horizontal]

Discussion

13.	An uniform flexible chain of mass m and length l hangs in equilibrium over a smooth horizontal pin of negligible diameter. One end of the chain is given a small vertical displacement so that the chain slips over the pin. The speed of chain when it leaves pin is
Answer» An uniform flexible chain of mass $m$ and length $l$ hangs in equilibrium over a smooth horizontal pin of negligible diameter. One end of the chain is given a small vertical displacement so that the chain slips over the pin. The speed of chain when it leaves pin is

Discussion

14.	A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block will be
Answer» A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block will be

Discussion

15.	Figure shows a wire sliding on two parallel, condu cting rails placed at a separation l. A magnetic field B exicts in a direction perpendicular to the plane of the rails. What force is necessary to keep the wire moving at a constant velocity v ?
Answer» Figure shows a wire sliding on two parallel, condu cting rails placed at a separation l. A magnetic field B exicts in a direction perpendicular to the plane of the rails. What force is necessary to keep the wire moving at a constant velocity v ?

15.

Figure shows a wire sliding on two parallel, condu cting rails placed at a separation l. A magnetic field B exicts in a direction perpendicular to the plane of the rails. What force is necessary to keep the wire moving at a constant velocity v ?

Answer»

Figure shows a wire sliding on two parallel, condu cting rails placed at a separation l. A magnetic field B exicts in a direction perpendicular to the plane of the rails. What force is necessary to keep the wire moving at a constant velocity v ?

Discussion

16.	A 10 kg ball attached at the end of a rigid massless rod of length (L=1 m) rotates at constant speed in a horizontal circle of radius 0.5 m with a period of 1.57 s, as shown in the figure. The force exerted by the rod on the ball is (Take g=10 ms−2 & π=3.14)
Answer» A $10 kg$ ball attached at the end of a rigid massless rod of length $(L = 1 m)$ rotates at constant speed in a horizontal circle of radius $0.5 m$ with a period of $1.57 s$ , as shown in the figure. The force exerted by the rod on the ball is (Take $g = 10 {ms}^{- 2}$ & $π = 3.14$ )

Discussion

17.	At what separation should two equal charges, 1.0 C each be placed so taht the force between them equals the weight of a 50 kg person?
Answer» At what separation should two equal charges, 1.0 C each be placed so taht the force between them equals the weight of a 50 kg person?

Discussion

18.	The variation of pressure P with volume V for an ideal monoatomic gas during an adiabatic process is shown in figure. At point A, find the magnitude of the rate of change of pressure with volume.
Answer» The variation of pressure $P$ with volume $V$ for an ideal monoatomic gas during an adiabatic process is shown in figure. At point $A$ , find the magnitude of the rate of change of pressure with volume.

Discussion

19.	Satrajit had learned in electrostatics that the electric field inside a conductor is always zero. Now they are telling him that when current flows, an electric field gets set up inside a conductor which drifts the electrons, thus making the current flow. This makes no sense to him. It makes no sense to him because
Answer» Satrajit had learned in electrostatics that the electric field inside a conductor is always zero. Now they are telling him that when current flows, an electric field gets set up inside a conductor which drifts the electrons, thus making the current flow. This makes no sense to him. It makes no sense to him because

Discussion

20.	The order of basic processes involved in succession is
Answer» The order of basic processes involved in succession is

Discussion

21.	A string is wrapped over the edge of a uniform disc and the free end is fixed with the ceiling. The disc moves down, unwinding the string. Find the downward acceleration of the disc.
Answer» A string is wrapped over the edge of a uniform disc and the free end is fixed with the ceiling. The disc moves down, unwinding the string. Find the downward acceleration of the disc.

Discussion

22.	The ionisation enthalpy of hydrogen atom is 1.312×106 J mol− . The energy required to excite the electron in the atom from n=1 to n=2 is:
Answer» The ionisation enthalpy of hydrogen atom is $1.312 \times 10^{6}$ J $m o l^{-}$ . The energy required to excite the electron in the atom from n=1 to n=2 is:

Discussion

23.	A hollow prism with side ABCD as open is kept in a region of electric field E. The field is parallel to the sides. BEC and AFD. Find the flux coming out of the pyramid?
Answer» A hollow prism with side ABCD as open is kept in a region of electric field E. The field is parallel to the sides. BEC and AFD. Find the flux coming out of the pyramid?

23.

A hollow prism with side ABCD as open is kept in a region of electric field E. The field is parallel to the sides. BEC and AFD. Find the flux coming out of the pyramid?

Answer»

A hollow prism with side ABCD as open is kept in a region of electric field E. The field is parallel to the sides. BEC and AFD. Find the flux coming out of the pyramid?

Discussion

24.	The length of the wire shown in figure between the pulley is 1.5 m and its mass is 12.0 g. find the frequency of vibration with which the wire vibrates in two loops leaving the middle point of the wire between the pulleys at rest.
Answer» The length of the wire shown in figure between the pulley is 1.5 m and its mass is 12.0 g. find the frequency of vibration with which the wire vibrates in two loops leaving the middle point of the wire between the pulleys at rest.

24.

The length of the wire shown in figure between the pulley is 1.5 m and its mass is 12.0 g. find the frequency of vibration with which the wire vibrates in two loops leaving the middle point of the wire between the pulleys at rest.

Answer»

The length of the wire shown in figure between the pulley is 1.5 m and its mass is 12.0 g. find the frequency of vibration with which the wire vibrates in two loops leaving the middle point of the wire between the pulleys at rest.

Discussion

25.	A car leaves station X for station Y every 10 min. The distance between X and Y is 60 km. The car travels at speed 60 km/h. A man drives a car from Y towards X at speed 60 km/h. If he starts at the moment when first car leaves station X, how many cars would he meet on route?
Answer» A car leaves station $X$ for station $Y$ every $10 min$ . The distance between $X$ and $Y$ is $60 km$ . The car travels at speed $60 km/h$ . A man drives a car from $Y$ towards $X$ at speed $60 km/h$ . If he starts at the moment when first car leaves station $X$ , how many cars would he meet on route?

Discussion

26.	The coordinates of middle point of the chord cut off on the line 2x−5y+18=0 by the circle x2+y2−6x+2y−54=0 is
Answer» The coordinates of middle point of the chord cut off on the line $2 x - 5 y + 18 = 0$ by the circle $x^{2} + y^{2} - 6 x + 2 y - 54 = 0$ is

Discussion

27.	Find the amplitude of motion of the air in the path of a 40 dB,1000 Hz sound wave. [Assume that the density of air is 1.3 kg/m3 and speed of sound in 340 m/s].
Answer» Find the amplitude of motion of the air in the path of a $40 dB, 1000 Hz$ sound wave. [Assume that the density of air is $1.3 {kg/m}^{3}$ and speed of sound in $340 m/s$ ].

Discussion

28.	A curved road of 50 m radius is banked at correct angle for a given speed. If the speed is to be doubled, keeping the same banking angle, the radius of curvature of the road should be changed to
Answer» A curved road of 50 m radius is banked at correct angle for a given speed. If the speed is to be doubled, keeping the same banking angle, the radius of curvature of the road should be changed to

Discussion

29.	The distances from the centre of the earth where the weights of the body is zero and one fourth that of the weight of body on the surface of earth respectively are___ (Assume R is the radius of the earth)
Answer» The distances from the centre of the earth where the weights of the body is zero and one fourth that of the weight of body on the surface of earth respectively are___ (Assume $R$ is the radius of the earth)

29.

The distances from the centre of the earth where the weights of the body is zero and one fourth that of the weight of body on the surface of earth respectively are___ (Assume R is the radius of the earth)

Answer»

The distances from the centre of the earth where the weights of the body is zero and one fourth that of the weight of body on the surface of earth respectively are___ (Assume $R$ is the radius of the earth)

Discussion

30.	A square lamina is as shown in ﬁgure. The moment of inertia of the frame about the three axes shown in ﬁgure are I1, I2 and I3 respectively. Select the correct alternative.
Answer» A square lamina is as shown in ﬁgure. The moment of inertia of the frame about the three axes shown in ﬁgure are $I_{1}, I_{2} a n d I_{3}$ respectively. Select the correct alternative.

Discussion

31.	A bob of mass m accelerates uniformly from rest to v1 in time t1.As a function of t, the instantaneous power delivered to the body is
Answer» A bob of mass m accelerates uniformly from rest to v₁ in time t₁.As a function of t, the instantaneous power delivered to the body is

Discussion

32.	Potential barrier developed in a junction diode opposes:
Answer» Potential barrier developed in a junction diode opposes:

Discussion

33.	Two conducting rings P and Q of radii r and 2r rotate uniformly in opposite directions with centre of mass velocities 2v and v respectively on a conducting surface S. There is a uniform magnetic field of magnitude B perpendicular to the plane of the rings. The potential difference between the highest points of the two rings is
Answer» Two conducting rings $P$ and $Q$ of radii $r$ and $2 r$ rotate uniformly in opposite directions with centre of mass velocities $2 v$ and $v$ respectively on a conducting surface $S$ . There is a uniform magnetic field of magnitude B perpendicular to the plane of the rings. The potential difference between the highest points of the two rings is

Discussion

34.	A glass capillary tube is of truncated cone with an apex angle of α so that its two ends have cross sections of different radii. When dipped in water vertically, water rises in it to a height h, where the radius of its cross section is b. If the surface tension of water is S, its density is ρ, and its contact angle with glass is θ, the value of h will be (g is the acceleration due to gravity)
Answer» A glass capillary tube is of truncated cone with an apex angle of $α$ so that its two ends have cross sections of different radii. When dipped in water vertically, water rises in it to a height $h$ , where the radius of its cross section is $b$ . If the surface tension of water is $S$ , its density is $ρ$ , and its contact angle with glass is $θ$ , the value of $h$ will be ( $g$ is the acceleration due to gravity)

Discussion

35.	What is the Electric Field due to various Charge Distribution in a Cube ? List all cases For e.g Find Electric Field through each face of a Cube if a charge is placed at Edge Centres. What is the approach to this problem ?
Answer» What is the Electric Field due to various Charge Distribution in a Cube ? List all cases For e.g Find Electric Field through each face of a Cube if a charge is placed at Edge Centres. What is the approach to this problem ?

35.

What is the Electric Field due to various Charge Distribution in a Cube ? List all cases For e.g Find Electric Field through each face of a Cube if a charge is placed at Edge Centres. What is the approach to this problem ?

Answer»

What is the Electric Field due to various Charge Distribution in a Cube ? List all cases

For e.g Find Electric Field through each face of a Cube if a charge is placed at Edge Centres.

What is the approach to this problem ?

Discussion

36.	What is parallax error ?
Answer» What is parallax error ?

Discussion

37.	A gas mixture consists of 2 moles of oxygen and 4 moles of Argon at temperature T. Neglecting all vibrational degrees of freedom, the total internal energy of the system is
Answer» A gas mixture consists of 2 moles of oxygen and 4 moles of Argon at temperature $T$ . Neglecting all vibrational degrees of freedom, the total internal energy of the system is

Discussion

38.	Stress generated in a wire when force F1 acts on it as shown in the figure, is T. Initial cross sectional area of the wire is A1. When force F2 replaces F1, cross-sectional area becomes A2. Find (A2A1) if F2=6 N. [Consider stress generated in the wire to be the same]
Answer» Stress generated in a wire when force $F_{1}$ acts on it as shown in the figure, is $T$ . Initial cross sectional area of the wire is $A_{1}$ . When force $F_{2}$ replaces $F_{1}$ , cross-sectional area becomes $A_{2}$ . Find $(\frac{A_{2}}{A_{1}})$ if $F_{2} = 6 N$ . [Consider stress generated in the wire to be the same]

Discussion

39.	A galvanometer shows a reading of 0.65 mA. When a galvanometer is shunted with a 4 Ω resistance, the deflection is reduced to 0.13 mA. If the galvanometer is further shunted with a 2 Ω wire, the new reading will be (the main current remains the same)
Answer» A galvanometer shows a reading of $0.65 mA$ . When a galvanometer is shunted with a $4 Ω$ resistance, the deflection is reduced to $0.13 mA$ . If the galvanometer is further shunted with a $2 Ω$ wire, the new reading will be (the main current remains the same)

Discussion

40.	A point source of light S is placed at a distance L in front of the centre of plane mirror of length(d). A man walks in front of the mirror along a line parallel to the mirror, at a distance 2L as shown below. The distance over which the man can see the image of the light source in the mirror is
Answer» A point source of light $S$ is placed at a distance $L$ in front of the centre of plane mirror of length $(d)$ . A man walks in front of the mirror along a line parallel to the mirror, at a distance $2 L$ as shown below. The distance over which the man can see the image of the light source in the mirror is

Discussion

41.	In the wire frame shown below, each side of a square (the smallest square) has a resistance 2 Ω. The equivalent resistance of the circuit (in Ω ) between the points A and B is
Answer» In the wire frame shown below, each side of a square (the smallest square) has a resistance $2 Ω$ . The equivalent resistance of the circuit (in $Ω$ ) between the points A and B is

Discussion

42.	The specific heat of a substance varies with temperature according to the function S=0.20+0.14T+0.023T2 with T in ∘C and S in cal/g∘C. What is the energy required to raise the temperature of 2.0 g of this substance from 5∘C to 15∘C?
Answer» The specific heat of a substance varies with temperature according to the function $S = 0.20 + 0.14 T + 0.023 T^{2}$ with $T$ in $^{\circ} C$ and $S$ in ${cal/g}^{\circ} C .$ What is the energy required to raise the temperature of $2.0 g$ of this substance from $5^{\circ} C$ to $15^{\circ} C$ ?

Discussion

43.	A point charge +q is placed on the axis of a closed cylinder of radius R and height 25R12 as shown. If electric flux coming out form the curved surface of cylinder is xq10∈0, then calculate x.
Answer» A point charge + $q$ is placed on the axis of a closed cylinder of radius $R$ and height $\frac{25 R}{12}$ as shown. If electric flux coming out form the curved surface of cylinder is $\frac{x q}{10 \in_{0}}$ , then calculate $x$ .

Discussion

44.	A ball collides with smooth and fixed inclined plane of inclination θ after falling vertically through a distance h m. If it moves horizontally just after the impact, then the coefficient of restitution is
Answer» A ball collides with smooth and fixed inclined plane of inclination $θ$ after falling vertically through a distance $h m$ . If it moves horizontally just after the impact, then the coefficient of restitution is

Discussion

45.	There is a uniform magnetic field B directed in negative z direction. A conductor ABC has length AB=l1, parallel to the x−axis, and length BC=l2 parallel to the y−axis. ABC moves in the xy plane with velocity vx^i+vy^j. The potential difference between A and C is proportional to
Answer» There is a uniform magnetic field $B$ directed in negative $z$ direction. A conductor $A B C$ has length $A B = l_{1}$ , parallel to the $x -$ axis, and length $B C = l_{2}$ parallel to the $y -$ axis. $A B C$ moves in the $x y$ plane with velocity $v_{x}^i + v_{y}^j$ . The potential difference between $A$ and $C$ is proportional to

Discussion

46.	A 1 kg ball is released and slides down from point A to point C, as shown in the figure below. If the acceleration due to gravity=10 m/s2, the kinetic energy of the ball when it arrives at point C.
Answer» A $1 kg$ ball is released and slides down from point $A$ to point $C$ , as shown in the figure below. If the acceleration due to gravity $= 10 m / s^{2}$ , the kinetic energy of the ball when it arrives at point $C$ .

Discussion

47.	If the pulley is massless and moves with an upward acceleration ao, find the acceleration of block m1 w.r.t elevator.
Answer» If the pulley is massless and moves with an upward acceleration $a_{o}$ , find the acceleration of block $m_{1}$ w.r.t elevator.

Discussion

48.	If the coefficient of friction between A and B is μ, the minimum horizontal acceleration of the wedge A for which B will remain at rest w.r.t. the wedge is
Answer» If the coefficient of friction between $A$ and $B$ is $μ$ , the minimum horizontal acceleration of the wedge $A$ for which $B$ will remain at rest w.r.t. the wedge is

Discussion

49.	Find the maximum value of the magnitude of force F for which the system will move together. Take g=10 m/s2.
Answer» Find the maximum value of the magnitude of force $F$ for which the system will move together. Take $g = 10 {m/s}^{2}$ .

Discussion

50.	From a square plate of side 10 m, a right angled triangle is removed as shown in the figure. The square plate has mass density 2 kg/m2. Find the centre of mass of the remaining portion. Assume the origin to be at the intersection of x and y axes.
Answer» From a square plate of side $10 m$ , a right angled triangle is removed as shown in the figure. The square plate has mass density $2 {kg/m}^{2}$ . Find the centre of mass of the remaining portion. Assume the origin to be at the intersection of $x$ and $y$ axes.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A metallic rod of length l is tied to a string of length 2l and made to rotate with angular speed ω on a horizontal table with one end of the string fixed. If there is a vertical magnetic field B in the region, the emf induced across the ends of the rod is

In a new system of units, called SHAR system, the unit of length is α m, the unit of mass is 1αkg kg and the unit of time is α2 s. The unit of work in this system is

A solid cone of height 2R and base radius R is placed over a solid hemisphere as shown in figure. Cone and hemisphere are made up of the same material. Height of center of mass of system from the ground is

A tuning fork of frequency 512 Hz is vibrated with a sonometer wire and 6 beats per second are heard. The beat frequency reduces if the tension in the string is slightly increased. The original frequency of vibration of the string is

A compound microscope has an eye piece of focal length 10 cm and an objective of focal length 4 cm. If an object is kept at a distance of 5 cm from the objective, so that the final image is formed at the least distance of distinct vision 20 cm, calculate the magnification.

Two point charges of magnitude q and 3q are located at a distance 'a' in dielectric medium of dielectric constant 2. The force applied by the larger charge 3q on dielectric is nq24πϵoa2. Here n is

A uniform cord of length 6.0 m and 12.0 kg is shown in the figure with a block of 3.0 kg suspended from it. Find the speed of the pulse on the horizontal part of the cord.

Suppose ideal gas equation follows VP3=constant. Initial temperature and volume of the gas are T and V respectively. If gas expand to 27V then its temperature will become

A wire of linear mass density 9×10–3 kg/m is stretched between two rigid supports under a tension of 360 N. The wire resonates at frequency 210 Hz. The next higher frequency at which the same wire resonates is 280 Hz. The number of loops produced in first case will be

The thermal capacity of 100 g of aluminum (specific heat =0.2 cal/g∘C) is

A horizontal force F acts on a sphere of mass M at its centre. Coefficient of friction between the ground and sphere is μ. Let the maximum force F for which there is no slipping be n2μMg. Find n.

An uniform flexible chain of mass m and length l hangs in equilibrium over a smooth horizontal pin of negligible diameter. One end of the chain is given a small vertical displacement so that the chain slips over the pin. The speed of chain when it leaves pin is

A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block will be

Figure shows a wire sliding on two parallel, condu cting rails placed at a separation l. A magnetic field B exicts in a direction perpendicular to the plane of the rails. What force is necessary to keep the wire moving at a constant velocity v ?

A 10 kg ball attached at the end of a rigid massless rod of length (L=1 m) rotates at constant speed in a horizontal circle of radius 0.5 m with a period of 1.57 s, as shown in the figure. The force exerted by the rod on the ball is (Take g=10 ms−2 &amp; π=3.14)

At what separation should two equal charges, 1.0 C each be placed so taht the force between them equals the weight of a 50 kg person?

The variation of pressure P with volume V for an ideal monoatomic gas during an adiabatic process is shown in figure. At point A, find the magnitude of the rate of change of pressure with volume.

The order of basic processes involved in succession is

A string is wrapped over the edge of a uniform disc and the free end is fixed with the ceiling. The disc moves down, unwinding the string. Find the downward acceleration of the disc.

The ionisation enthalpy of hydrogen atom is 1.312×106 J mol− . The energy required to excite the electron in the atom from n=1 to n=2 is:

A hollow prism with side ABCD as open is kept in a region of electric field E. The field is parallel to the sides. BEC and AFD. Find the flux coming out of the pyramid?

The length of the wire shown in figure between the pulley is 1.5 m and its mass is 12.0 g. find the frequency of vibration with which the wire vibrates in two loops leaving the middle point of the wire between the pulleys at rest.

A car leaves station X for station Y every 10 min. The distance between X and Y is 60 km. The car travels at speed 60 km/h. A man drives a car from Y towards X at speed 60 km/h. If he starts at the moment when first car leaves station X, how many cars would he meet on route?

The coordinates of middle point of the chord cut off on the line 2x−5y+18=0 by the circle x2+y2−6x+2y−54=0 is

Find the amplitude of motion of the air in the path of a 40 dB,1000 Hz sound wave. [Assume that the density of air is 1.3 kg/m3 and speed of sound in 340 m/s].

A curved road of 50 m radius is banked at correct angle for a given speed. If the speed is to be doubled, keeping the same banking angle, the radius of curvature of the road should be changed to

The distances from the centre of the earth where the weights of the body is zero and one fourth that of the weight of body on the surface of earth respectively are___ (Assume R is the radius of the earth)

A square lamina is as shown in ﬁgure. The moment of inertia of the frame about the three axes shown in ﬁgure are I1, I2 and I3 respectively. Select the correct alternative.

A bob of mass m accelerates uniformly from rest to v1 in time t1.As a function of t, the instantaneous power delivered to the body is

Potential barrier developed in a junction diode opposes:

What is the Electric Field due to various Charge Distribution in a Cube ? List all cases For e.g Find Electric Field through each face of a Cube if a charge is placed at Edge Centres. What is the approach to this problem ?

What is parallax error ?​​​​

A gas mixture consists of 2 moles of oxygen and 4 moles of Argon at temperature T. Neglecting all vibrational degrees of freedom, the total internal energy of the system is

Stress generated in a wire when force F1 acts on it as shown in the figure, is T. Initial cross sectional area of the wire is A1. When force F2 replaces F1, cross-sectional area becomes A2. Find (A2A1) if F2=6 N. [Consider stress generated in the wire to be the same]

A galvanometer shows a reading of 0.65 mA. When a galvanometer is shunted with a 4 Ω resistance, the deflection is reduced to 0.13 mA. If the galvanometer is further shunted with a 2 Ω wire, the new reading will be (the main current remains the same)

A point source of light S is placed at a distance L in front of the centre of plane mirror of length(d). A man walks in front of the mirror along a line parallel to the mirror, at a distance 2L as shown below. The distance over which the man can see the image of the light source in the mirror is

In the wire frame shown below, each side of a square (the smallest square) has a resistance 2 Ω. The equivalent resistance of the circuit (in Ω ) between the points A and B is

The specific heat of a substance varies with temperature according to the function S=0.20+0.14T+0.023T2 with T in ∘C and S in cal/g∘C. What is the energy required to raise the temperature of 2.0 g of this substance from 5∘C to 15∘C?

A point charge +q is placed on the axis of a closed cylinder of radius R and height 25R12 as shown. If electric flux coming out form the curved surface of cylinder is xq10∈0, then calculate x.

A ball collides with smooth and fixed inclined plane of inclination θ after falling vertically through a distance h m. If it moves horizontally just after the impact, then the coefficient of restitution is

There is a uniform magnetic field B directed in negative z direction. A conductor ABC has length AB=l1, parallel to the x−axis, and length BC=l2 parallel to the y−axis. ABC moves in the xy plane with velocity vx^i+vy^j. The potential difference between A and C is proportional to

A 1 kg ball is released and slides down from point A to point C, as shown in the figure below. If the acceleration due to gravity=10 m/s2, the kinetic energy of the ball when it arrives at point C.

If the pulley is massless and moves with an upward acceleration ao, find the acceleration of block m1 w.r.t elevator.

If the coefficient of friction between A and B is μ, the minimum horizontal acceleration of the wedge A for which B will remain at rest w.r.t. the wedge is

Find the maximum value of the magnitude of force F for which the system will move together. Take g=10 m/s2.

From a square plate of side 10 m, a right angled triangle is removed as shown in the figure. The square plate has mass density 2 kg/m2. Find the centre of mass of the remaining portion. Assume the origin to be at the intersection of x and y axes.

A 10 kg ball attached at the end of a rigid massless rod of length (L=1 m) rotates at constant speed in a horizontal circle of radius 0.5 m with a period of 1.57 s, as shown in the figure. The force exerted by the rod on the ball is (Take g=10 ms−2 & π=3.14)

What is parallax error ?