50278 + Interview Questions in Physics

1.	If the ratio of maximum and minimum intensities of an interference pattern is 36:1, then the ratio of amplitudes of the two interfering waves will be
Answer» If the ratio of maximum and minimum intensities of an interference pattern is $36 : 1$ , then the ratio of amplitudes of the two interfering waves will be

Discussion

2.	Derive an expression for the velocity of an electron revolving round the nucleus in the orbit of hydrogen atom.
Answer» Derive an expression for the velocity of an electron revolving round the nucleus in the orbit of hydrogen atom.

Discussion

3.	Calculate the wave number of line frequency of 4 × 1014 sec-1.
Answer» Calculate the wave number of line frequency of 4 × 10¹⁴sec^-1.

Discussion

4.	An object M is placed at a distance of 3 m from a mirror kept at some height with its lower end at 2 m from ground as shown in the figure. There is a person at a distance of 4 m from the object. The ratio of minimum height and maximum height of the person required to see the image of the object will be
Answer» An object $M$ is placed at a distance of $3 m$ from a mirror kept at some height with its lower end at $2 m$ from ground as shown in the figure. There is a person at a distance of $4 m$ from the object. The ratio of minimum height and maximum height of the person required to see the image of the object will be

Discussion

5.	The heat rejected per cycle by a heat engine to the surroundings is 60 % of the heat supplied. Find the efficiency of heat engine.
Answer» The heat rejected per cycle by a heat engine to the surroundings is $60 %$ of the heat supplied. Find the efficiency of heat engine.

Discussion

6.	If there is velecity is given by v=3t² + 2 and we have to find distance then we will have to integrate, then while integrating if have limits as 0 to 6 for time then what does the limits tell me
Answer» If there is velecity is given by v=3t² + 2 and we have to find distance then we will have to integrate, then while integrating if have limits as 0 to 6 for time then what does the limits tell me

Discussion

7.	The sim of the numbers 436.32, 227.2, and 0.301 in appropriate significiant figures is : a)663.821 b)664 c)663.8 d)663.82
Answer» The sim of the numbers 436.32, 227.2, and 0.301 in appropriate significiant figures is : a)663.821 b)664 c)663.8 d)663.82

7.

The sim of the numbers 436.32, 227.2, and 0.301 in appropriate significiant figures is : a)663.821 b)664 c)663.8 d)663.82

Answer»

The sim of the numbers 436.32, 227.2, and 0.301 in appropriate significiant figures is :

a)663.821 b)664 c)663.8 d)663.82

Discussion

8.	A space shuttle is pulled closer towards the earth by earth's gravity. In this case the work done by the internal forces of earth - shuttle system is positive.but why don't we consider the concept of change in potential energy to find the workdone?
Answer» A space shuttle is pulled closer towards the earth by earth's gravity. In this case the work done by the internal forces of earth - shuttle system is positive.but why don't we consider the concept of change in potential energy to find the workdone?

Discussion

9.	(i) Position vector →A(1)2^i+^j (ii) Postion vector →B(2)3^i+3^j (iii)Displacement →dAB(3)5^i+4^j (iv)Position vector of point of intersection of path 1 & path 2 (4)4^i+3^j
Answer» (i) Position vector $\to A (1) 2^i +^j$ (ii) Postion vector $\to B (2) 3^i + 3^j$ (iii)Displacement ${\to d}_{A B} (3) 5^i + 4^j$ (iv)Position vector of point of intersection of path 1 & path 2 $(4) 4^i + 3^j$

9.

(i) Position vector →A(1)2^i+^j (ii) Postion vector →B(2)3^i+3^j (iii)Displacement →dAB(3)5^i+4^j (iv)Position vector of point of intersection of path 1 & path 2 (4)4^i+3^j

Answer»

(i) Position vector $\to A (1) 2^i +^j$
(ii) Postion vector $\to B (2) 3^i + 3^j$
(iii)Displacement ${\to d}_{A B} (3) 5^i + 4^j$
(iv)Position vector of point of
intersection of path 1 & path 2 $(4) 4^i + 3^j$

Discussion

10.	A particle leaces the origin with an initial velocity →v = ( 3.00 ^i ) m/s and a constant acceleration →a = ( - 1.00^i−0.500^j ) m/s2 . When it reaches its maximum x coordinate , what are its velocity and position vector? (i) Position vector U. -10^j (ii) velocity vector V.4.5^i−22.5^j W.4.5^i−21.5^j X. -15^j
Answer» A particle leaces the origin with an initial velocity $\to v$ = ( 3.00 $^i$ ) m/s and a constant acceleration $\to a$ = ( - 1.00 $^i - 0.500^j$ ) m/ $s^{2}$ . When it reaches its maximum x coordinate , what are its velocity and position vector? (i) Position vector U. -10 $^j$ (ii) velocity vector V.4.5 $^i - 22.5^j$ W.4.5 $^i - 21.5^j$ X. -15 $^j$

10.

A particle leaces the origin with an initial velocity →v = ( 3.00 ^i ) m/s and a constant acceleration →a = ( - 1.00^i−0.500^j ) m/s2 . When it reaches its maximum x coordinate , what are its velocity and position vector? (i) Position vector U. -10^j (ii) velocity vector V.4.5^i−22.5^j W.4.5^i−21.5^j X. -15^j

Answer»

A particle leaces the origin with an initial velocity $\to v$ = ( 3.00 $^i$ ) m/s and a constant acceleration $\to a$ = ( - 1.00 $^i - 0.500^j$ ) m/ $s^{2}$ . When it reaches its maximum x coordinate , what are its velocity and position vector?

(i) Position vector U. -10 $^j$

(ii) velocity vector V.4.5 $^i - 22.5^j$

W.4.5 $^i - 21.5^j$

X. -15 $^j$

Discussion

11.	A stone tied to one end of string of 1 m long is whirled in a horizontal circle with a constant speed. If the stone makes 10 revolutions in 20 s, the magnitude of the acceleration of the stone is close to
Answer» A stone tied to one end of string of $1 m$ long is whirled in a horizontal circle with a constant speed. If the stone makes $10$ revolutions in $20 s$ , the magnitude of the acceleration of the stone is close to

Discussion

12.	How will you find si unit of magnetic flux and magnetic field? What are the various possible units of magnetic flux ?sir
Answer» How will you find si unit of magnetic flux and magnetic field? What are the various possible units of magnetic flux ?sir

12.

How will you find si unit of magnetic flux and magnetic field? What are the various possible units of magnetic flux ?sir

Answer»

How will you find si unit of magnetic flux and magnetic field?

What are the various possible units of magnetic flux ?sir

Discussion

13.	A person goes to height equal to 2R from surface of earth (where R is radius of earth), weight of the person at this height is W1 and weight of person at surface of earth is W2, then W1W2 will be
Answer» A person goes to height equal to $2 R$ from surface of earth (where $R$ is radius of earth), weight of the person at this height is $W_{1}$ and weight of person at surface of earth is $W_{2}$ , then $\frac{W_{1}}{W_{2}}$ will be

Discussion

14.	Particle A of mass m experiences a perfectly elastic collision with a stationary particle B of mass M. After the collision (head-on) the particles fly apart in opposite directions with equal velocities. Then :
Answer» Particle A of mass m experiences a perfectly elastic collision with a stationary particle B of mass M. After the collision (head-on) the particles fly apart in opposite directions with equal velocities. Then :

Discussion

15.	The motion of a particle of mass m is described by y=ut+1/2gt^2.Find the force acting on the particle
Answer» The motion of a particle of mass m is described by y=ut+1/2gt^2.Find the force acting on the particle

Discussion

16.	A projectile is fired at an angle θ with the horizontal. The condition under which it lands perpendicular on the fixed inclined plane with inclination α as shown in figure is,
Answer» A projectile is fired at an angle $θ$ with the horizontal. The condition under which it lands perpendicular on the fixed inclined plane with inclination α as shown in figure is,

Discussion

17.	E0 and Eh respectively represent the average kinetic energy of a molecule of oxygen and hydrogen. If the two gases are at the same temperature, which of the following statements is true?
Answer» $E_{0}$ and $E_{h}$ respectively represent the average kinetic energy of a molecule of oxygen and hydrogen. If the two gases are at the same temperature, which of the following statements is true?

Discussion

18.	A small block of mass 2 kg is kept on a rough inclined surface of inclination θ=30∘ fixed in a lift. The lift goes up with a uniform speed of 1 ms−1 and the block does not slide relative to the inclined surface. The work done by the force of friction on the block in a time interval of 2 s is.
Answer» A small block of mass 2 kg is kept on a rough inclined surface of inclination $θ = 30^{\circ}$ fixed in a lift. The lift goes up with a uniform speed of 1 m $s^{- 1}$ and the block does not slide relative to the inclined surface. The work done by the force of friction on the block in a time interval of 2 s is.

Discussion

19.	A steel wire is 1 m long and 1 mm2 in area of cross section. If it takes 200 N to stretch this wire by 1 mm. How much force will be required to stretch a wire of same material as well as same cross-section area from its normal length of 2 m by a length of 20 mm?
Answer» A steel wire is $1 m$ long and $1 {mm}^{2}$ in area of cross section. If it takes $200 N$ to stretch this wire by $1 mm$ . How much force will be required to stretch a wire of same material as well as same cross-section area from its normal length of $2 m$ by a length of $20 mm$ ?

Discussion

20.	I am confused to use which trigonometric formula when a long question comes 4(cos^3 10^° + sin^3 20^°)=3(cos 10^° + sin 20^°)
Answer» I am confused to use which trigonometric formula when a long question comes 4(cos^3 10^° + sin^3 20^°)=3(cos 10^° + sin 20^°)

Discussion

21.	The length of the wire shown in figure (15 - E8) between the pulley is 1.5 m and its mass is 12.0 g. Find the frequency of vibration with which the wire vibrate in two loops leaving the middle point of the wire between the pulleys at rest.
Answer» The length of the wire shown in figure (15 - E8) between the pulley is 1.5 m and its mass is 12.0 g. Find the frequency of vibration with which the wire vibrate in two loops leaving the middle point of the wire between the pulleys at rest.

21.

The length of the wire shown in figure (15 - E8) between the pulley is 1.5 m and its mass is 12.0 g. Find the frequency of vibration with which the wire vibrate in two loops leaving the middle point of the wire between the pulleys at rest.

Answer»

The length of the wire shown in figure (15 - E8) between the pulley is 1.5 m and its mass is 12.0 g. Find the frequency of vibration with which the wire vibrate in two loops leaving the middle point of the wire between the pulleys at rest.

Discussion

22.	A thin uniform rod of mass m and length l is kept on a smooth horizontal surface such that it can move freely. At what distance x from the centre of the rod should a particle of mass m strike on the rod such that the point P at a distance l3 from the end of the rod is instantaneously at rest just after the elastic collision ?
Answer» A thin uniform rod of mass $m$ and length $l$ is kept on a smooth horizontal surface such that it can move freely. At what distance $x$ from the centre of the rod should a particle of mass $m$ strike on the rod such that the point $P$ at a distance $\frac{l}{3}$ from the end of the rod is instantaneously at rest just after the elastic collision ?

Discussion

23.	A tuning fork vibrates at 264 Hz. The shortest length of a closed organ pipe that will resonate with the tuning fork is [Speed of sound in air =350 m/s]
Answer» A tuning fork vibrates at $264 Hz$ . The shortest length of a closed organ pipe that will resonate with the tuning fork is [Speed of sound in air $= 350 m/s$ ]

Discussion

24.	A light rod AB of length 2 m is suspended from the ceiling horizontally by means of two vertical wires as shown in Fig. One of the wires is made of steel of cross-section 0.1 cm2 and the other of brass of cross-section 0.2 cm2. The Young's modulus of brass is 1.0 ×1011 Nm−2 and of steel is 2.0×1011 Nm−2. A weight W is hung at point C at a distance x from end A. It is found that the stress in the two wires is the same when x=n3 metre. Find the value of n.
Answer» A light rod $A B$ of length $2 m$ is suspended from the ceiling horizontally by means of two vertical wires as shown in Fig. One of the wires is made of steel of cross-section $0.1 {cm}^{2}$ and the other of brass of cross-section $0.2 {cm}^{2}$ . The Young's modulus of brass is $1.0 \times 10^{11} {Nm}^{- 2}$ and of steel is $2.0 \times 10^{11} {Nm}^{- 2}$ . A weight $W$ is hung at point $C$ at a distance $x$ from end $A$ . It is found that the stress in the two wires is the same when $x = \frac{n}{3} metre$ . Find the value of $n$ .

Discussion

25.	The velocity vs time graph of a body of mass 15 kg is shown in the figure. What is the power delivered by net external force acting on body? Consider work done by internal forces to be zero.
Answer» The velocity vs time graph of a body of mass $15 kg$ is shown in the figure. What is the power delivered by net external force acting on body? Consider work done by internal forces to be zero.

Discussion

26.	The pulleys and strings shown in the figure are smooth and massless. For the system to remain in equilibrium, the angle θ should be:
Answer» The pulleys and strings shown in the figure are smooth and massless. For the system to remain in equilibrium, the angle $θ$ should be:

Discussion

27.	Find the acceleration of mass m1 and m2 in the arrangement shown in figure, if mass m2 is twice that of mass m1, and the angle that the inclined plane forms with the horizontal is equal to 30∘. Mass of the pulley and string are negligible and friction is absent everywhere.
Answer» Find the acceleration of mass $m_{1}$ and $m_{2}$ in the arrangement shown in figure, if mass $m_{2}$ is twice that of mass $m_{1}$ , and the angle that the inclined plane forms with the horizontal is equal to $30^{\circ}$ . Mass of the pulley and string are negligible and friction is absent everywhere.

Discussion

28.	The temperature, at which the root mean square velocity of hydrogen molecules equals their escape velocity from the earth is closest to (Take g=10 m/s2)
Answer» The temperature, at which the root mean square velocity of hydrogen molecules equals their escape velocity from the earth is closest to (Take $g = 10 m / s^{2}$ )

Discussion

29.	A particle tied to a string describes a vertical circular motion of radius R continuously. If it has velocity √3gR at the highest point, then the ratio of respective tensions in the string at the highest and lowest point is
Answer» A particle tied to a string describes a vertical circular motion of radius $R$ continuously. If it has velocity $\sqrt{3 g R}$ at the highest point, then the ratio of respective tensions in the string at the highest and lowest point is

Discussion

30.	In the adjoining figure, the coefficient of friction between wedge (of mass M) and block (of mass m) is μ. Find the minimum horizontal force F required to keep the block stationary with respect to wedge.
Answer» In the adjoining figure, the coefficient of friction between wedge (of mass M) and block (of mass m) is $μ$ . Find the minimum horizontal force F required to keep the block stationary with respect to wedge.

30.

In the adjoining figure, the coefficient of friction between wedge (of mass M) and block (of mass m) is μ. Find the minimum horizontal force F required to keep the block stationary with respect to wedge.

Answer»

In the adjoining figure, the coefficient of friction between wedge (of mass M) and block (of mass m) is $μ$ .

Find the minimum horizontal force F required to keep the block stationary with respect to wedge.

Discussion

31.	If the coefficient of friction between A and B is μ, the maximum acceleration of the wedge A for which B will remain at rest with respect to the wedge is:
Answer» If the coefficient of friction between $A$ and $B$ is $μ$ , the maximum acceleration of the wedge $A$ for which $B$ will remain at rest with respect to the wedge is:

Discussion

32.	2 kg of ice at −20∘C is mixed with 5 kg of water at 20∘C in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal/kg per∘C and 0.5 kcal/kg/∘C while the latent heat of fusion of ice is 80 kcal/kg.
Answer» $2 kg$ of ice at $- 20^{\circ} C$ is mixed with $5 kg$ of water at $20^{\circ} C$ in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are $1 {kcal/kg per}^{\circ} C$ and $0.5 {kcal/kg/}^{\circ} C$ while the latent heat of fusion of ice is $80 kcal/kg$ .

Discussion

33.	A body of mass is moved horizontally by a force 'F' at an angle of 45 degree from the horizontal. Find the normal force.
Answer» A body of mass is moved horizontally by a force 'F' at an angle of 45 degree from the horizontal. Find the normal force.

Discussion

34.	Two bodies A and B are travelling with constant velocities of 20 m/s and 30 m/s in opposite direction. The relative speed of A with respect to B is
Answer» Two bodies $A$ and $B$ are travelling with constant velocities of $20 m/s$ and $30 m/s$ in opposite direction. The relative speed of $A$ with respect to $B$ is

Discussion

35.	Four mass are fixed on a mass less rod as shown, the moment of inertia about the axis P in kg m2
Answer» Four mass are fixed on a mass less rod as shown, the moment of inertia about the axis P in kg $m^{2}$

35.

Four mass are fixed on a mass less rod as shown, the moment of inertia about the axis P in kg m2

Answer»

Four mass are fixed on a mass less rod as shown, the moment of inertia about the axis P in kg $m^{2}$

Discussion

36.	A particle executing simple harmonic motion has angular frequency 6.28 s−1 and amplitude 10 cm. Find (x) the speed when the displacement is 6 cm, from the mean position, (y) the speed at t=16 s assuming that the motion starts from rest at t=0. (i) 25.1 cms−1 (ii) 54.4 cms−1 (iii) 50.2 cms−1 (iv) 27.2 cms−1
Answer» A particle executing simple harmonic motion has angular frequency $6.28 s^{-} 1$ and amplitude $10 c m$ . Find $(x)$ the speed when the displacement is $6 c m$ , from the mean position, $(y)$ the speed at $t = \frac{1}{6} s$ assuming that the motion starts from rest at $t = 0$ . (i) $25.1 c m s^{- 1}$ (ii) $54.4 c m s^{- 1}$ (iii) $50.2 c m s^{- 1}$ (iv) $27.2 c m s^{- 1}$

Discussion

37.	The energy in monochromatic X-rays of wavelength 1 angstrom is roughly equal to
Answer» The energy in monochromatic X-rays of wavelength 1 angstrom is roughly equal to

Discussion

38.	Solve the integral I=∫R∞GMmx2dx
Answer» Solve the integral $I = \int_{\infty}^{R} \frac{G M m}{x^{2}} d x$

Discussion

39.	Which of the following may represent electric field lines?
Answer» Which of the following may represent electric field lines?

Discussion

40.	Using differentials, find the approximate value of the following up to 3 places of decimal. (3.968)32
Answer» Using differentials, find the approximate value of the following up to 3 places of decimal. $(3.968)^{\frac{3}{2}}$

Discussion

41.	The space between plates of a capacitor is filled up with two dielectrics of K = 3 and K = 6. If the electric field strength between plates of K = 3 and in K = 6 are E1 and E2 respectively, then the value E1E2 is
Answer» The space between plates of a capacitor is filled up with two dielectrics of $K$ = 3 and $K$ = 6. If the electric field strength between plates of $K$ = 3 and in $K$ = 6 are $E_{1} a n d E_{2}$ respectively, then the value $\frac{E_{1}}{E_{2}}$ is

Discussion

42.	A glass full of water has a bottom of area 20cm2, top of area 20cm2, height 20 cm and volume half a litre. (a) Find the force exerted by the water on the bottom. (b) Considering the equilibrium of the water, find the resultant force exerted by the sides of the glass on the water. Atmospheric pressure =1.0×105Nm−2. Density of water = 1000kgm−3 and g=10ms−2. Take all numbers to be exact.
Answer» A glass full of water has a bottom of area $20 c m^{2}$ , top of area $20 c m^{2}$ , height 20 cm and volume half a litre. (a) Find the force exerted by the water on the bottom. (b) Considering the equilibrium of the water, find the resultant force exerted by the sides of the glass on the water. Atmospheric pressure = $1.0 \times 10^{5} N m^{- 2}$ . Density of water = $1000 k g m^{- 3}$ and $g = 10 m s^{- 2}$ . Take all numbers to be exact.

Discussion

43.	According to Newton's law of gravitation, every object in the universe attracts every another object, then why dont objects move under the influence of this force of gravitation?
Answer» According to Newton's law of gravitation, every object in the universe attracts every another object, then why dont objects move under the influence of this force of gravitation?

Discussion

44.	Two particles are executing SHM, one with angular frequency ω and the other with ′2ω′. Which of the following acceleration a vs x graphs correctly represent SHM's of two particles.
Answer» Two particles are executing SHM, one with angular frequency $ω$ and the other with $^{'} 2 ω^{'}$ . Which of the following acceleration $a$ vs $x$ graphs correctly represent SHM's of two particles.

Discussion

45.	A constant force acting on a body of m=3 kg changes its speed from 2 to 3.5 m/s in 25 s . in the direction of the motion of the body . what is the magnitude and direction of the force?
Answer» A constant force acting on a body of m=3 kg changes its speed from 2 to 3.5 m/s in 25 s . in the direction of the motion of the body . what is the magnitude and direction of the force?

Discussion

46.	Lithium boron hydride crystallizes in an orthorhombic system with 4 molecules per unit cell. Dimensions of the unit cell are: a=6∘A,b=4∘A and c=7 ∘A. If the molar mass is 21 g, calculate the density of crystal.
Answer» Lithium boron hydride crystallizes in an orthorhombic system with 4 molecules per unit cell. Dimensions of the unit cell are: $a = 6 \circ A, b = 4 \circ A$ and $c = 7 \circ A$ . If the molar mass is $21 g$ , calculate the density of crystal.

Discussion

47.	The vectors from origin to the points A and B are →a=2^i−3^j+2^k and →b=2^i+3^j+^k respectively,then the area of △OAB is equal to (a) 340 (b) √25 (c) √229 (d) 12√229
Answer» The vectors from origin to the points A and B are $\to a = 2^i - 3^j + 2^k a n d \to b = 2^i + 3^j +^k$ respectively,then the area of $△ O A B$ is equal to (a) 340 (b) $\sqrt{25}$ (c) $\sqrt{229}$ (d) $\frac{1}{2} \sqrt{229}$

47.

The vectors from origin to the points A and B are →a=2^i−3^j+2^k and →b=2^i+3^j+^k respectively,then the area of △OAB is equal to (a) 340 (b) √25 (c) √229 (d) 12√229

Answer»

The vectors from origin to the points A and B are $\to a = 2^i - 3^j + 2^k a n d \to b = 2^i + 3^j +^k$ respectively,then the area of $△ O A B$ is equal to

(a) 340 (b) $\sqrt{25}$ (c) $\sqrt{229}$ (d) $\frac{1}{2} \sqrt{229}$

Discussion

48.	Obtain the relation between electric field and electric potential at a point
Answer» Obtain the relation between electric field and electric potential at a point

Discussion

49.	Can an image be considered as matter!
Answer» Can an image be considered as matter!

Discussion

50.	Cyclotron derivation frequency angular frequency limitations
Answer» Cyclotron derivation frequency angular frequency limitations

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If the ratio of maximum and minimum intensities of an interference pattern is 36:1, then the ratio of amplitudes of the two interfering waves will be

Derive an expression for the velocity of an electron revolving round the nucleus in the orbit of hydrogen atom.

Calculate the wave number of line frequency of 4 × 1014 sec​​​​-1.

The heat rejected per cycle by a heat engine to the surroundings is 60 % of the heat supplied. Find the efficiency of heat engine.

If there is velecity is given by v=3t² + 2 and we have to find distance then we will have to integrate, then while integrating if have limits as 0 to 6 for time then what does the limits tell me ​​

The sim of the numbers 436.32, 227.2, and 0.301 in appropriate significiant figures is : a)663.821 b)664 c)663.8 d)663.82

A space shuttle is pulled closer towards the earth by earth's gravity. In this case the work done by the internal forces of earth - shuttle system is positive.but why don't we consider the concept of change in potential energy to find the workdone?

(i) Position vector →A(1)2^i+^j (ii) Postion vector →B(2)3^i+3^j (iii)Displacement →dAB(3)5^i+4^j (iv)Position vector of point of intersection of path 1 &amp; path 2 (4)4^i+3^j

A stone tied to one end of string of 1 m long is whirled in a horizontal circle with a constant speed. If the stone makes 10 revolutions in 20 s, the magnitude of the acceleration of the stone is close to

How will you find si unit of magnetic flux and magnetic field? What are the various possible units of magnetic flux ?sir

A person goes to height equal to 2R from surface of earth (where R is radius of earth), weight of the person at this height is W1 and weight of person at surface of earth is W2, then W1W2 will be

Particle A of mass m experiences a perfectly elastic collision with a stationary particle B of mass M. After the collision (head-on) the particles fly apart in opposite directions with equal velocities. Then :

The motion of a particle of mass m is described by y=ut+1/2gt^2.Find the force acting on the particle

A projectile is fired at an angle θ with the horizontal. The condition under which it lands perpendicular on the fixed inclined plane with inclination α as shown in figure is,

E0 and Eh respectively represent the average kinetic energy of a molecule of oxygen and hydrogen. If the two gases are at the same temperature, which of the following statements is true?

A small block of mass 2 kg is kept on a rough inclined surface of inclination θ=30∘ fixed in a lift. The lift goes up with a uniform speed of 1 ms−1 and the block does not slide relative to the inclined surface. The work done by the force of friction on the block in a time interval of 2 s is.

A steel wire is 1 m long and 1 mm2 in area of cross section. If it takes 200 N to stretch this wire by 1 mm. How much force will be required to stretch a wire of same material as well as same cross-section area from its normal length of 2 m by a length of 20 mm?

I am confused to use which trigonometric formula when a long question comes 4(cos^3 10^° + sin^3 20^°)=3(cos 10^° + sin 20^°)

The length of the wire shown in figure (15 - E8) between the pulley is 1.5 m and its mass is 12.0 g. Find the frequency of vibration with which the wire vibrate in two loops leaving the middle point of the wire between the pulleys at rest.

A tuning fork vibrates at 264 Hz. The shortest length of a closed organ pipe that will resonate with the tuning fork is [Speed of sound in air =350 m/s]

The velocity vs time graph of a body of mass 15 kg is shown in the figure. What is the power delivered by net external force acting on body? Consider work done by internal forces to be zero.

The pulleys and strings shown in the figure are smooth and massless. For the system to remain in equilibrium, the angle θ should be:

Find the acceleration of mass m1 and m2 in the arrangement shown in figure, if mass m2 is twice that of mass m1, and the angle that the inclined plane forms with the horizontal is equal to 30∘. Mass of the pulley and string are negligible and friction is absent everywhere.

The temperature, at which the root mean square velocity of hydrogen molecules equals their escape velocity from the earth is closest to (Take g=10 m/s2)

A particle tied to a string describes a vertical circular motion of radius R continuously. If it has velocity √3gR at the highest point, then the ratio of respective tensions in the string at the highest and lowest point is

In the adjoining figure, the coefficient of friction between wedge (of mass M) and block (of mass m) is μ. Find the minimum horizontal force F required to keep the block stationary with respect to wedge.

If the coefficient of friction between A and B is μ, the maximum acceleration of the wedge A for which B will remain at rest with respect to the wedge is:

A body of mass is moved horizontally by a force 'F' at an angle of 45 degree from the horizontal. Find the normal force.

Two bodies A and B are travelling with constant velocities of 20 m/s and 30 m/s in opposite direction. The relative speed of A with respect to B is

Four mass are fixed on a mass less rod as shown, the moment of inertia about the axis P in kg m2

The energy in monochromatic X-rays of wavelength 1 angstrom is roughly equal to

Solve the integral I=∫R∞GMmx2dx

Which of the following may represent electric field lines?

Using differentials, find the approximate value of the following up to 3 places of decimal. (3.968)32

The space between plates of a capacitor is filled up with two dielectrics of K = 3 and K = 6. If the electric field strength between plates of K = 3 and in K = 6 are E1 and E2 respectively, then the value E1E2 is

According to Newton's law of gravitation, every object in the universe attracts every another object, then why dont objects move under the influence of this force of gravitation?

Two particles are executing SHM, one with angular frequency ω and the other with ′2ω′. Which of the following acceleration a vs x graphs correctly represent SHM's of two particles.

A constant force acting on a body of m=3 kg changes its speed from 2 to 3.5 m/s in 25 s . in the direction of the motion of the body . what is the magnitude and direction of the force?

Lithium boron hydride crystallizes in an orthorhombic system with 4 molecules per unit cell. Dimensions of the unit cell are: a=6∘A,b=4∘A and c=7 ∘A. If the molar mass is 21 g, calculate the density of crystal.

The vectors from origin to the points A and B are →a=2^i−3^j+2^k and →b=2^i+3^j+^k respectively,then the area of △OAB is equal to (a) 340 (b) √25 (c) √229 (d) 12√229

Obtain the relation between electric field and electric potential at a point

Can an image be considered as matter!

Cyclotron derivation frequency angular frequency limitations

Calculate the wave number of line frequency of 4 × 1014 sec-1.

If there is velecity is given by v=3t² + 2 and we have to find distance then we will have to integrate, then while integrating if have limits as 0 to 6 for time then what does the limits tell me

(i) Position vector →A(1)2^i+^j (ii) Postion vector →B(2)3^i+3^j (iii)Displacement →dAB(3)5^i+4^j (iv)Position vector of point of intersection of path 1 & path 2 (4)4^i+3^j