50278 + Interview Questions in Physics

1.	A trolley having a cannon fixed to it which can shoot only vertically, is moving with a velocity v0=12 m/sec in horizontal direction. At a certain instant, it is at a distance of 120 m from a balloon which is held on ground and now it is released. The balloon starts rising with constant velocity 2v0. Calculate the minimum velocity(in m/s) of cannon ball so that it can hit the balloon.
Answer» A trolley having a cannon fixed to it which can shoot only vertically, is moving with a velocity $v_{0} = 12 m/sec$ in horizontal direction. At a certain instant, it is at a distance of $120 m$ from a balloon which is held on ground and now it is released. The balloon starts rising with constant velocity $2 v_{0}$ . Calculate the minimum velocity(in $m/s$ ) of cannon ball so that it can hit the balloon.

Discussion

2.	In a simple microscope of focal length 6.25 cm, if the final image is located at infinity then its magnifying power is(integer only)
Answer» In a simple microscope of focal length $6.25 cm$ , if the final image is located at infinity then its magnifying power is(integer only)

Discussion

3.	A point charge +q is placed at outside of a metal sphere with centre O as shown. Potential at point P due to induced charge on the sphere is (k=14πε0)एक बिन्दु आवेश +q को दर्शाए अनुसार केन्द्र O वाले एक धात्विक गोले के बाहर रखा जाता है। गोले पर प्रेरित आवेश के कारण बिन्दु P पर विभव है (k=14πε0)
Answer» A point charge +q is placed at outside of a metal sphere with centre O as shown. Potential at point P due to induced charge on the sphere is $(k = \frac{1}{4 π ε_{0}})$ एक बिन्दु आवेश +q को दर्शाए अनुसार केन्द्र O वाले एक धात्विक गोले के बाहर रखा जाता है। गोले पर प्रेरित आवेश के कारण बिन्दु P पर विभव है $(k = \frac{1}{4 π ε_{0}})$

Discussion

4.	A spring of spring constant 50 N/m initially at its natural length is compressed through 1 cm. Find the work done by the spring-force on the external agent, compressing the spring.
Answer» A spring of spring constant $50 N/m$ initially at its natural length is compressed through $1 cm$ . Find the work done by the spring-force on the external agent, compressing the spring.

Discussion

5.	Three condensers are connected as shown in series. If the insulated plate of C1 is at 45 V and one plate of C3 is earthed, the P.D. between the plates of C2 is
Answer» Three condensers are connected as shown in series. If the insulated plate of $C_{1}$ is at $45 V$ and one plate of $C_{3}$ is earthed, the P.D. between the plates of $C_{2}$ is

Discussion

6.	A ray of light falls on a horizontal plane mirror at 60 degree .Through what angle, should the mirror be tilted to make the reflected ray horizontal?
Answer» A ray of light falls on a horizontal plane mirror at 60 degree .Through what angle, should the mirror be tilted to make the reflected ray horizontal?

Discussion

7.	A cubical wooden box of side L is placed on a horizontal rough surface and the coefficient of static friction between them is μ. Another cubical box of same wood but of length 2L is placed on the same surface. Then the coefficient of static friction is
Answer» A cubical wooden box of side $L$ is placed on a horizontal rough surface and the coefficient of static friction between them is $μ$ . Another cubical box of same wood but of length $2 L$ is placed on the same surface. Then the coefficient of static friction is

Discussion

8.	Find out the value of resistance R in figure.
Answer» Find out the value of resistance $R$ in figure.

Discussion

9.	It is known that time of revolution T of a satellite around the Earth depends on the universal gravitational constant G, the mass of Earth M,and the radius of circular orbit R. Obtain an expression for T using dimensional analysis.
Answer» It is known that time of revolution T of a satellite around the Earth depends on the universal gravitational constant G, the mass of Earth M,and the radius of circular orbit R. Obtain an expression for T using dimensional analysis.

Discussion

10.	a solid cylinder of mass 2kg and radius 50cm rolls up an inclined plane of angle of inclination 30 degree the centre of mass of cylinder has speed of 4m\s the distance travelled by the cylinder surface will be
Answer» a solid cylinder of mass 2kg and radius 50cm rolls up an inclined plane of angle of inclination 30 degree the centre of mass of cylinder has speed of 4m\s the distance travelled by the cylinder surface will be

Discussion

11.	A cylinder of radius R is rolling with velocity of centre of mass v=ωR2 towards right. Keeping the centre of the cylinder as the origin, Find the coordinates of the point with zero net velocity.
Answer» A cylinder of radius R is rolling with velocity of centre of mass $v = \frac{ω R}{2}$ towards right. Keeping the centre of the cylinder as the origin, Find the coordinates of the point with zero net velocity.

Discussion

12.	A car moves literally with uniform retardation. If car covers 40m in last 2 seconds of its motion, wgat is the velocity of car at the beginning of the last second?
Answer» A car moves literally with uniform retardation. If car covers 40m in last 2 seconds of its motion, wgat is the velocity of car at the beginning of the last second?

Discussion

13.	How many neutrons are presented 1 drop of water at 4degree celcius
Answer» How many neutrons are presented 1 drop of water at 4degree celcius

Discussion

14.	In a certain sample of a gas at 25^° C, no of molecules having speed between 4 to 4.1 kmph is N. If temp is doubled then no of molecules b/w 4-4.1kmph is
Answer» In a certain sample of a gas at 25^° C, no of molecules having speed between 4 to 4.1 kmph is N. If temp is doubled then no of molecules b/w 4-4.1kmph is

Discussion

15.	A body is moving down an inclined plane of slope 37∘. The coefficient of friction between the body and the plane varies as μ=0.3x, where x is the distance travelled down the plane by the body. The value of x for which the body will have maximum speed is (sin 37∘=35)
Answer» A body is moving down an inclined plane of slope $37^{\circ}$ . The coefficient of friction between the body and the plane varies as $μ = 0.3 x$ , where $x$ is the distance travelled down the plane by the body. The value of $x$ for which the body will have maximum speed is $(sin 37^{\circ} = \frac{3}{5})$

Discussion

16.	In LR circuit, the AC source has voltage 220 V. If the potential difference across the inductor is 176 V, the potential difference across the resistor will be
Answer» In $LR$ circuit, the $AC$ source has voltage $220 V$ . If the potential difference across the inductor is $176 V$ , the potential difference across the resistor will be

Discussion

17.	A bullet of mass 10g moving with a velocity of 400 m/s gets embedded in a freely suspended wooden block of mass 990 g. The velocity acquired by the block will be
Answer» A bullet of mass 10g moving with a velocity of 400 m/s gets embedded in a freely suspended wooden block of mass 990 g. The velocity acquired by the block will be

Discussion

18.	The wavelength of de-Broglie wave is 2μ m, then its momentum is (h=6.63×10−34J−s)
Answer» The wavelength of de-Broglie wave is $2 μ m$ , then its momentum is $(h = 6.63 \times 10^{- 34} J - s)$

Discussion

19.	A galvanometer coil has a resistance 80 Ω and full scale deflection current 10 mA. 920 Ω resistance is connected with the galvanometer to make it a voltmeter. If the least count of the voltmeter is 0.2 V, the number of divisions on the scale is
Answer» A galvanometer coil has a resistance $80 Ω$ and full scale deflection current $10 mA$ . $920 Ω$ resistance is connected with the galvanometer to make it a voltmeter. If the least count of the voltmeter is $0.2 V$ , the number of divisions on the scale is

Discussion

20.	How many 440ohm resistance in parallel one requited to carry 5A in a 220v line?
Answer» How many 440ohm resistance in parallel one requited to carry 5A in a 220v line?

Discussion

21.	The potential difference between the ends of a resistance R is VR between the ends of capacitor is VC=2VR and between the ends of inductance is VL=3VR, then the alternating potential of the source in terms of VR will be –
Answer» The potential difference between the ends of a resistance $R$ is $V_{R}$ between the ends of capacitor is $V_{C} = 2 V_{R}$ and between the ends of inductance is $V_{L} = 3 V_{R},$ then the alternating potential of the source in terms of $V_{R}$ will be –

Discussion

22.	Stablish relation between torque and angular force.
Answer» Stablish relation between torque and angular force.

Discussion

23.	A person pushes a box kept on a horizontal surface with a force of 100 N. In unit vector notation, the force can be expressed as
Answer» A person pushes a box kept on a horizontal surface with a force of $100 N$ . In unit vector notation, the force can be expressed as

Discussion

24.	I ask to my teacher,"sir,could we travel to stars???" He said "No man because we didn't have that much of fuel" But once we leave the escape velocity of earth then the shuttle moves on with same velocity when he released from earth escape layer... Then why we need fuel for travel in space to go to stars......
Answer» I ask to my teacher,"sir,could we travel to stars???" He said "No man because we didn't have that much of fuel" But once we leave the escape velocity of earth then the shuttle moves on with same velocity when he released from earth escape layer... Then why we need fuel for travel in space to go to stars......

Discussion

25.	If the speed of a car is given as v=2t+5 m/s, total distance covered by the car in 5 sec is
Answer» If the speed of a car is given as $v = 2 t + 5 m/s$ , total distance covered by the car in $5 s e c$ is

Discussion

26.	The resistance of the following circuit between A and B is
Answer» The resistance of the following circuit between A and B is

Discussion

27.	In the arrangement shown in the figure, slits S3 and S4 are having a variable separation Z. Point O on the screen is at the common perpendicular bisector of S1S2 and S3S4.When Z=λD2d the intensity measured at O is I0. The intensity at O when Z=2λDd is
Answer» In the arrangement shown in the figure, slits $S_{3}$ and $S_{4}$ are having a variable separation $Z$ . Point $O$ on the screen is at the common perpendicular bisector of $S_{1} S_{2}$ and $S_{3} S_{4}$ . When $Z = \frac{λ D}{2 d}$ the intensity measured at $O$ is $I_{0}$ . The intensity at $O$ when $Z = \frac{2 λ D}{d}$ is

Discussion

28.	The figure shows a conducting loop of which the semicircular part lies in the magnetic induction B which varies with time, given as B=at3+ct2+9, where a & b are positive constant. The wire is having resistance per unit length is R Ω/m. Find current in loop.
Answer» The figure shows a conducting loop of which the semicircular part lies in the magnetic induction $B$ which varies with time, given as $B = a t^{3} + c t^{2} + 9$ , where $a & b$ are positive constant. The wire is having resistance per unit length is $R Ω / m$ . Find current in loop.

Discussion

29.	When a load of 10N is hanged from a wire, the elongation produced is x mm. If the wire goes over a pulley and two weights 10N each are hung at the two ends, the elongation of the wire will be(in mm)
Answer» When a load of 10N is hanged from a wire, the elongation produced is x mm. If the wire goes over a pulley and two weights 10N each are hung at the two ends, the elongation of the wire will be(in mm)

Discussion

30.	A disc of radius R and mass M is pivoted at the rim and is set for small oscillations. If simple pendulum has to have the same period as that of the disc, the length of the simple pendulum should be
Answer» A disc of radius $R$ and mass $M$ is pivoted at the rim and is set for small oscillations. If simple pendulum has to have the same period as that of the disc, the length of the simple pendulum should be

Discussion

31.	A cylindrical disk of mass 5 kg is constrained with the two springs as shown in figure. R is radius of the disk and it rolls without slip. Determine the natural frequency for small oscillations about the mid position shown in fig. The stiffness of the each spring is 3 N/cm.
Answer» A cylindrical disk of mass 5 kg is constrained with the two springs as shown in figure. R is radius of the disk and it rolls without slip. Determine the natural frequency for small oscillations about the mid position shown in fig. The stiffness of the each spring is 3 N/cm.

Discussion

32.	The solid angle subtended by the periphery of an area 1 cm2 at a point situated symmetrically at a distance of 5 cm from the area is :
Answer» The solid angle subtended by the periphery of an area $1 {cm}^{2}$ at a point situated symmetrically at a distance of $5 cm$ from the area is :

Discussion

33.	Find themagnitude of two vectors,having the same magnitude and such that the angle between them is 60°and their scalar product is.
Answer» Find the magnitude of two vectors, having the same magnitude and such that the angle between them is 60° and their scalar product is.

Discussion

34.	when we multiply 8 with 5.0003, how many significant figures do we consider for 8? 1 significant figure or infinite significant figures??when do we take it to be infinite?
Answer» when we multiply 8 with 5.0003, how many significant figures do we consider for 8? 1 significant figure or infinite significant figures??when do we take it to be infinite?

Discussion

35.	An extended wheatstone bridge is as shown in the figure below. If C1=C2=C3=C4=10 μF and C5=C6=C7=C8=5 μF , then find the value of equivalent capacitance.
Answer» An extended wheatstone bridge is as shown in the figure below. If $C_{1} = C_{2} = C_{3} = C_{4} = 10 μ F$ and $C_{5} = C_{6} = C_{7} = C_{8} = 5 μ F$ , then find the value of equivalent capacitance.

Discussion

36.	Two masses m are attached to opposite sides of a rigid rotating shaft in the vertical plane. Another pair of equal masses m1 is attached to the opposite sides of the shaft in the vertical plane as shown in figgure. Consider m = 1 kgm e = 50 mm, e1=20 mm, b=0.3 m, a = 2 m and a1=2.5 m.For the system to be dynamically balanced. m1 should be kg
Answer» Two masses m are attached to opposite sides of a rigid rotating shaft in the vertical plane. Another pair of equal masses $m_{1}$ is attached to the opposite sides of the shaft in the vertical plane as shown in figgure. Consider m = 1 kgm e = 50 mm, $e_{1}$ =20 mm, b=0.3 m, a = 2 m and $a_{1}$ =2.5 m. For the system to be dynamically balanced. $m_{1}$ should be kg

Discussion

37.	wavelength of electron having energy 10keV is
Answer» wavelength of electron having energy 10keV is

Discussion

38.	A 12.5 eV electron beamis used to bombard gaseous hydrogen at room temperature. What seriesof wavelengths will be emitted?
Answer» A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?

Discussion

39.	An object falling freely covers half of its total distance in last second, then find total height and total time.g=9.8m/s2
Answer» An object falling freely covers half of its total distance in last second, then find total height and total time.g=9.8m/s2

Discussion

40.	The eye cannot distinguish two consecutive light pulses separately if the time interval between them is less than -
Answer» The eye cannot distinguish two consecutive light pulses separately if the time interval between them is less than -

Discussion

41.	From what minimum height h must the system be released when a spring is unstretched so that after perfectly inelastic collision (e=0) with ground, B may be lifted off the ground (spring constant =k)
Answer» From what minimum height h must the system be released when a spring is unstretched so that after perfectly inelastic collision (e=0) with ground, B may be lifted off the ground (spring constant =k)

Discussion

42.	The equipotential surface always perpendicular to the electric field because 1.work done on surface is zero four point charge 2. Work done never equal to zero 3. Electric field is conservative 4. None of these
Answer» The equipotential surface always perpendicular to the electric field because 1.work done on surface is zero four point charge 2. Work done never equal to zero 3. Electric field is conservative 4. None of these

42.

The equipotential surface always perpendicular to the electric field because 1.work done on surface is zero four point charge 2. Work done never equal to zero 3. Electric field is conservative 4. None of these

Answer»

The equipotential surface always perpendicular to the electric field because

1.work done on surface is zero four point charge

2. Work done never equal to zero

3. Electric field is conservative

4. None of these

Discussion

43.	One conducting U-tube can slice inside another as shown in the figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed v, then the emf induced in the circuit in terms of B,l and v where l is the width of each tube, will be
Answer» One conducting U-tube can slice inside another as shown in the figure, maintaining electrical contacts between the tubes. The magnetic field $B$ is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed $v$ , then the emf induced in the circuit in terms of $B, l$ and $v$ where $l$ is the width of each tube, will be

Discussion

44.	The equations of motion of two waves propagating in the same direction is given by y1=A sin(ωt−kx) and y2=A sin(ωt−kx−θ) The amplitude of the medium particle will be
Answer» The equations of motion of two waves propagating in the same direction is given by $y_{1} = A s i n (ω t - k x)$ and $y_{2} = A s i n (ω t - k x - θ)$ The amplitude of the medium particle will be

Discussion

45.	At Deoprayag (Garhwal, UP) river Alaknanda mixes with the river Bhagirathi and becomes river Ganga. Suppose Alaknanda has a width of 12 m, Bhagirathi has a width of 8 m and Ganga has a width of 16 m. Assume that the depth of water is same in the three rivers. Let the average speed of water in Alaknanda be 20 km h-1 and in Bhagirathi be 16 km h-1. Find the average speed of water in the river Ganga.
Answer» At Deoprayag (Garhwal, UP) river Alaknanda mixes with the river Bhagirathi and becomes river Ganga. Suppose Alaknanda has a width of 12 m, Bhagirathi has a width of 8 m and Ganga has a width of 16 m. Assume that the depth of water is same in the three rivers. Let the average speed of water in Alaknanda be 20 km h^-1 and in Bhagirathi be 16 km h^-1. Find the average speed of water in the river Ganga.

Discussion

46.	how can linear combination of sine and cosine functions like f(t)= Asinwt+Bcoswt is a periodic function?
Answer» how can linear combination of sine and cosine functions like f(t)= Asinwt+Bcoswt is a periodic function?

Discussion

47.	A sphere is suspended by a thread of length I. What minimum horizontal velocity has to be imparted to the ball for it to reach the height of the suspension?
Answer» A sphere is suspended by a thread of length I. What minimum horizontal velocity has to be imparted to the ball for it to reach the height of the suspension?

Discussion

48.	A thin lens made of glass (refractive index=1.5) of focal length f=16 cm is immersed in a liquid of refractive index 1.42. If its focal length in liquid is f1, then the ratio f1/f is closest to the integer:
Answer» A thin lens made of glass $(refractive index=1.5)$ of focal length $f = 16 cm$ is immersed in a liquid of refractive index $1.42$ . If its focal length in liquid is $f_{1}$ , then the ratio $f_{1} / f$ is closest to the integer:

Discussion

49.	Three identical rods, each of mass m and length l, form an equilateral triangle. Moment of inertia about one of the sides is
Answer» Three identical rods, each of mass $m$ and length $l$ , form an equilateral triangle. Moment of inertia about one of the sides is

Discussion

50.	Statement 1 – A square of side 2m lying on y – z plane can be represented as 4^i or −4^i vectorially. Statement – Any planar area can have two directions perpendicular to it. Select the correct option:
Answer» Statement 1 – A square of side 2m lying on y – z plane can be represented as $4^i o r - 4^i$ vectorially. Statement – Any planar area can have two directions perpendicular to it. Select the correct option:

50.

Statement 1 – A square of side 2m lying on y – z plane can be represented as 4^i or −4^i vectorially. Statement – Any planar area can have two directions perpendicular to it. Select the correct option:

Answer»

Statement 1 – A square of side 2m lying on y – z plane can be represented as $4^i o r - 4^i$ vectorially.

Statement – Any planar area can have two directions perpendicular to it.

Select the correct option:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In a simple microscope of focal length 6.25 cm, if the final image is located at infinity then its magnifying power is(integer only)

A spring of spring constant 50 N/m initially at its natural length is compressed through 1 cm. Find the work done by the spring-force on the external agent, compressing the spring.

Three condensers are connected as shown in series. If the insulated plate of C1 is at 45 V and one plate of C3 is earthed, the P.D. between the plates of C2 is

A ray of light falls on a horizontal plane mirror at 60 degree .Through what angle, should the mirror be tilted to make the reflected ray horizontal?

A cubical wooden box of side L is placed on a horizontal rough surface and the coefficient of static friction between them is μ. Another cubical box of same wood but of length 2L is placed on the same surface. Then the coefficient of static friction is

Find out the value of resistance R in figure.

It is known that time of revolution T of a satellite around the Earth depends on the universal gravitational constant G, the mass of Earth M,and the radius of circular orbit R. Obtain an expression for T using dimensional analysis.

a solid cylinder of mass 2kg and radius 50cm rolls up an inclined plane of angle of inclination 30 degree the centre of mass of cylinder has speed of 4m\s the distance travelled by the cylinder surface will be

A cylinder of radius R is rolling with velocity of centre of mass v=ωR2 towards right. Keeping the centre of the cylinder as the origin, Find the coordinates of the point with zero net velocity.

A car moves literally with uniform retardation. If car covers 40m in last 2 seconds of its motion, wgat is the velocity of car at the beginning of the last second?

How many neutrons are presented 1 drop of water at 4degree celcius

In a certain sample of a gas at 25^° C, no of molecules having speed between 4 to 4.1 kmph is N. If temp is doubled then no of molecules b/w 4-4.1kmph is

A body is moving down an inclined plane of slope 37∘. The coefficient of friction between the body and the plane varies as μ=0.3x, where x is the distance travelled down the plane by the body. The value of x for which the body will have maximum speed is (sin 37∘=35)

In LR circuit, the AC source has voltage 220 V. If the potential difference across the inductor is 176 V, the potential difference across the resistor will be

A bullet of mass 10g moving with a velocity of 400 m/s gets embedded in a freely suspended wooden block of mass 990 g. The velocity acquired by the block will be

The wavelength of de-Broglie wave is 2μ m, then its momentum is (h=6.63×10−34J−s)

A galvanometer coil has a resistance 80 Ω and full scale deflection current 10 mA. 920 Ω resistance is connected with the galvanometer to make it a voltmeter. If the least count of the voltmeter is 0.2 V, the number of divisions on the scale is

How many 440ohm resistance in parallel one requited to carry 5A in a 220v line?

The potential difference between the ends of a resistance R is VR between the ends of capacitor is VC=2VR and between the ends of inductance is VL=3VR, then the alternating potential of the source in terms of VR will be –

Stablish relation between torque and angular force.

A person pushes a box kept on a horizontal surface with a force of 100 N. In unit vector notation, the force can be expressed as

If the speed of a car is given as v=2t+5 m/s, total distance covered by the car in 5 sec is

The resistance of the following circuit between A and B is

In the arrangement shown in the figure, slits S3 and S4 are having a variable separation Z. Point O on the screen is at the common perpendicular bisector of S1S2 and S3S4.When Z=λD2d the intensity measured at O is I0. The intensity at O when Z=2λDd is

The figure shows a conducting loop of which the semicircular part lies in the magnetic induction B which varies with time, given as B=at3+ct2+9, where a &amp; b are positive constant. The wire is having resistance per unit length is R Ω/m. Find current in loop.

When a load of 10N is hanged from a wire, the elongation produced is x mm. If the wire goes over a pulley and two weights 10N each are hung at the two ends, the elongation of the wire will be(in mm)

A disc of radius R and mass M is pivoted at the rim and is set for small oscillations. If simple pendulum has to have the same period as that of the disc, the length of the simple pendulum should be

A cylindrical disk of mass 5 kg is constrained with the two springs as shown in figure. R is radius of the disk and it rolls without slip. Determine the natural frequency for small oscillations about the mid position shown in fig. The stiffness of the each spring is 3 N/cm.

The solid angle subtended by the periphery of an area 1 cm2 at a point situated symmetrically at a distance of 5 cm from the area is :

Find themagnitude of two vectors,having the same magnitude and such that the angle between them is 60°and their scalar product is.

when we multiply 8 with 5.0003, how many significant figures do we consider for 8? 1 significant figure or infinite significant figures??when do we take it to be infinite?

An extended wheatstone bridge is as shown in the figure below. If C1=C2=C3=C4=10 μF and C5=C6=C7=C8=5 μF , then find the value of equivalent capacitance.

wavelength of electron having energy 10keV is

A 12.5 eV electron beamis used to bombard gaseous hydrogen at room temperature. What seriesof wavelengths will be emitted?

An object falling freely covers half of its total distance in last second, then find total height and total time.g=9.8m/s2

The eye cannot distinguish two consecutive light pulses separately if the time interval between them is less than -

From what minimum height h must the system be released when a spring is unstretched so that after perfectly inelastic collision (e=0) with ground, B may be lifted off the ground (spring constant =k)

The equipotential surface always perpendicular to the electric field because 1.work done on surface is zero four point charge 2. Work done never equal to zero 3. Electric field is conservative 4. None of these

The equations of motion of two waves propagating in the same direction is given by y1=A sin(ωt−kx) and y2=A sin(ωt−kx−θ) The amplitude of the medium particle will be

how can linear combination of sine and cosine functions like f(t)= Asinwt+Bcoswt is a periodic function?

A sphere is suspended by a thread of length I. What minimum horizontal velocity has to be imparted to the ball for it to reach the height of the suspension?

A thin lens made of glass (refractive index=1.5) of focal length f=16 cm is immersed in a liquid of refractive index 1.42. If its focal length in liquid is f1, then the ratio f1/f is closest to the integer:

Three identical rods, each of mass m and length l, form an equilateral triangle. Moment of inertia about one of the sides is

Statement 1 – A square of side 2m lying on y – z plane can be represented as 4^i or −4^i vectorially. Statement – Any planar area can have two directions perpendicular to it. Select the correct option:

The figure shows a conducting loop of which the semicircular part lies in the magnetic induction B which varies with time, given as B=at3+ct2+9, where a & b are positive constant. The wire is having resistance per unit length is R Ω/m. Find current in loop.