50278 + Interview Questions in Physics

1.	A wooden ball of density D is immersed in water of density d to a depth h below the surface of water and then released. Upto what height will the ball jump out of water( measured from surface of water) ?
Answer» A wooden ball of density $D$ is immersed in water of density $d$ to a depth $h$ below the surface of water and then released. Upto what height will the ball jump out of water( measured from surface of water) ?

Discussion

2.	A photon in motion has a mass
Answer» A photon in motion has a mass

Discussion

3.	If the distance between the earth and the sun were half its present value, the number of days in a year would have been :
Answer» If the distance between the earth and the sun were half its present value, the number of days in a year would have been :

Discussion

4.	Two charges placed in air repel each other by a force of 10NN. When oil is introduced between the charges, the force becomes 2.5×10−5N. The dielectric constant of oil is
Answer» Two charges placed in air repel each other by a force of $10^{N} N .$ When oil is introduced between the charges, the force becomes $2.5 \times 10^{- 5} N$ . The dielectric constant of oil is

Discussion

5.	A beam of unpolarized light of intensity I0 is passed through a Polaroid A and then through another Polaroid B which is oriented so that its principal plane makes an angle of 45∘ relative to that of A.The intensity of the emergent light is I0x, Find the value of x.
Answer» A beam of unpolarized light of intensity $I_{0}$ is passed through a Polaroid $A$ and then through another Polaroid $B$ which is oriented so that its principal plane makes an angle of $45^{\circ}$ relative to that of $A$ .The intensity of the emergent light is $\frac{I_{0}}{x},$ Find the value of $x .$

Discussion

6.	44.Salon of gross weight W newton is falling vertically downward with a constant acceleration a(
Answer» 44.Salon of gross weight W newton is falling vertically downward with a constant acceleration a(

Discussion

7.	A capacitor is charged with a battery and energy stored is U. After disconnecting the battery, another identical uncharged capacitor is connected in parallel with it. The energy stored in each capacitor is now
Answer» A capacitor is charged with a battery and energy stored is $U$ . After disconnecting the battery, another identical uncharged capacitor is connected in parallel with it. The energy stored in each capacitor is now

Discussion

8.	Two blocks A(3kg) and B(6kg) are connected by a spring of stiffness 200 N/m and plaInitially the spring has its equilibrium length. The indicated velocities are imparted to A(1m/s) and B(2m/s. The maximun extension of the spring will be
Answer» Two blocks A(3kg) and B(6kg) are connected by a spring of stiffness 200 N/m and plaInitially the spring has its equilibrium length. The indicated velocities are imparted to A(1m/s) and B(2m/s. The maximun extension of the spring will be

Discussion

9.

Applied AC voltage is given as, V=V0sin(ωt). Corresponding to this voltage, match the following two columns. Column I Column IIa. I=I0sin(ωt)b. I=−I0cos(ωt)c. I=I0sin(ωt+π/6) p. only R circuit q. only L circuitr. may be RC circuit

Answer»

Applied AC voltage is given as, $V = V_{0} sin (ω t)$ . Corresponding to this voltage, match the following two columns.

Column $I$	Column $II$
$a$ . $I = I_{0} sin (ω t)$ $b$ . $I = - I_{0} cos (ω t)$ $c$ . $I = I_{0} sin (ω t + π / 6)$	$p$ . only $R$ circuit $q$ . only $L$ circuit $r$ . may be $R C$ circuit

Discussion

10.	6.Name the electromagnetic unit and practical units of current . how they are related ?
Answer» 6.Name the electromagnetic unit and practical units of current . how they are related ?

Discussion

11.	the capaci†an ce of a parallel plate capacitor with air between the plates is 3μ f with the introduction of a dielectric medium between the plates the capaci†an ce becomes 15μ f the relative permittivity of the medium i
Answer» the capaci†an ce of a parallel plate capacitor with air between the plates is 3μ f with the introduction of a dielectric medium between the plates the capaci†an ce becomes 15μ f the relative permittivity of the medium i

Discussion

12.	A block is moving on an inclined plane making an angle 45° with the horizontal and the coefficient of friction is μ. The force required to just push it up the inclined plane is 3 times the force required to just prevent it from sliding down. If we define N=10μ, then N is
Answer» A block is moving on an inclined plane making an angle 45° with the horizontal and the coefficient of friction is $μ$ . The force required to just push it up the inclined plane is 3 times the force required to just prevent it from sliding down. If we define $N = 10 μ$ , then N is

Discussion

13.	A particle is moving along a straight-line path according to the relationS2=at2+2bt+cS represents the displacement covered in t seconds and a,b,c are constants. The acceleration of the particle varies as
Answer» A particle is moving along a straight-line path according to the relation $S^{2} = a t^{2} + 2 b t + c$ $S$ represents the displacement covered in t seconds and $a, b, c$ are constants. The acceleration of the particle varies as

Discussion

14.	An object slides without friction from the height 25 cm and then goes around the vertical loop of radius 10 cm from which a symmetrical section of angle 2α has been removed. Find the angle α such that after losing contact at A and flying through air, the object will reach point B.
Answer» An object slides without friction from the height $25 cm$ and then goes around the vertical loop of radius $10 cm$ from which a symmetrical section of angle $2 α$ has been removed. Find the angle $α$ such that after losing contact at $A$ and flying through air, the object will reach point $B$ .

Discussion

15.	The wavelength λe of an electron and λp of a photon of same energy E are related by -
Answer» The wavelength $λ_{e}$ of an electron and λp of a photon of same energy E are related by -

Discussion

16.	A light wooden rod fixed at one end is kept horizontal. A load of 0.4 kg tied to the free end of the rod causes that end to be depressed by 2.8 cm . If this load is set into up and down vibrations, with what frequency(in Hz) will it oscillate?
Answer» A light wooden rod fixed at one end is kept horizontal. A load of $0.4 kg$ tied to the free end of the rod causes that end to be depressed by $2.8 cm$ . If this load is set into up and down vibrations, with what frequency(in $Hz$ ) will it oscillate?

Discussion

17.	In order to make an object float in a fluid. Its weight should be equal to
Answer» In order to make an object float in a fluid. Its weight should be equal to

Discussion

18.	A small pulley of radius 30 cm and moment of inertia 0.72 kg m2 is used to hang a 2 kg mass with the help of massless string. If the block is released, what will be its acceleration for no slipping condition?
Answer» A small pulley of radius $30 cm$ and moment of inertia $0.72 {kg m}^{2}$ is used to hang a $2 kg$ mass with the help of massless string. If the block is released, what will be its acceleration for no slipping condition?

Discussion

19.	An electric circuit consists of four identical bulbs connected in parallel to a battery of 25 V. If one of the bulbs is fused and the electric current through each of the other bulbs is 2.3 A, what is the net electric current flowing in the circuit?
Answer» An electric circuit consists of four identical bulbs connected in parallel to a battery of $25 V$ . If one of the bulbs is fused and the electric current through each of the other bulbs is $2.3 A$ , what is the net electric current flowing in the circuit?

Discussion

20.	Consider a particle of mass m suspended vertically by a string at the equator. Let R and M denote the radius and the mass of the earth respectively. If ω is the angular velocity of earth's rotation about its own axis, the tension in the string is equal to
Answer» Consider a particle of mass m suspended vertically by a string at the equator. Let R and M denote the radius and the mass of the earth respectively. If $ω$ is the angular velocity of earth's rotation about its own axis, the tension in the string is equal to

Discussion

21.	Two blocks of masses 4 kg and 2 kg are connected by a light string and placed on rough horizontal plane. The 2 kg block is pulled with a constant force F as shown in the figure. The coefficient of friction between the blocks and the ground is 0.5. What is the value of F so that tension in the string is constant throughtout the motion of the blocks?
Answer» Two blocks of masses $4 kg$ and $2 kg$ are connected by a light string and placed on rough horizontal plane. The $2 kg$ block is pulled with a constant force $F$ as shown in the figure. The coefficient of friction between the blocks and the ground is $0.5$ . What is the value of $F$ so that tension in the string is constant throughtout the motion of the blocks?

Discussion

22.	We have →F=4^i−3^j. Another vector that is perpendicular to →F is
Answer» We have $\to F = 4^i - 3^j$ . Another vector that is perpendicular to $\to F$ is

Discussion

23.	A polythene piece rubbed with wool is found to have a negativecharge of 3 × 10–7 C. (a) Estimate the number of electrons transferred (from which towhich?) (b) Is there a transfer of mass from wool to polythene?
Answer» A polythene piece rubbed with wool is found to have a negativecharge of 3 × 10–7 C. (a) Estimate the number of electrons transferred (from which towhich?) (b) Is there a transfer of mass from wool to polythene?

Discussion

24.	The angle of dip at a place is 37∘ and the vertical component of the earth's magnetic field is 6×10−5T. What is the earth's magnetic field at this place?
Answer» The angle of dip at a place is 37∘ and the vertical component of the earth's magnetic field is 6×10−5T. What is the earth's magnetic field at this place?

Discussion

25.	22. An alpha particle and proton enter a region of uniform magnetic field which is perpendicular to their direction of motion find ratio of radius of circle described by them if they 1.have same velocity 2.have same momentum 3.have same energy 4.are accelerated by same potential difference
Answer» 22. An alpha particle and proton enter a region of uniform magnetic field which is perpendicular to their direction of motion find ratio of radius of circle described by them if they 1.have same velocity 2.have same momentum 3.have same energy 4.are accelerated by same potential difference

Discussion

26.	A double slit is illuminated by light of wavelength 6000 ∘A. The slits are 0.1 cm apart and the screen is placed one meter away. Then the angular position of the 10th maximum in radian and separation of the two adjacent minima will be respectively
Answer» A double slit is illuminated by light of wavelength $6000 \circ A$ . The slits are $0.1 c m$ apart and the screen is placed one meter away. Then the angular position of the $10^{t h}$ maximum in radian and separation of the two adjacent minima will be respectively

Discussion

27.	the specific heat of a gas is found to be 0.075 calories at constant volume and its formula wt is 40 .the atomicity of the gas would be1)one 2)two 3)three4)four
Answer» the specific heat of a gas is found to be 0.075 calories at constant volume and its formula wt is 40 .the atomicity of the gas would be 1)one 2)two 3)three 4)four

Discussion

28.	A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of 120 rev/min in a plane normal to the earth's magnetic field at the place. If the magnitude of the magnetic field is 0.4 G, what is the induced emf between the axle and the rim of the wheel ?
Answer» A wheel with $10$ metallic spokes each $0.5 m$ long is rotated with a speed of $120 rev/min$ in a plane normal to the earth's magnetic field at the place. If the magnitude of the magnetic field is $0.4 G$ , what is the induced emf between the axle and the rim of the wheel ?

Discussion

29.	A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time t is proportional to (i) t⅟² (ii) t (iii) t³́² (iv) t²
Answer» A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time t is proportional to (i) t⅟² (ii) t (iii) t³́² (iv) t²

Discussion

30.	The linear momentum of an electron, initially at rest, accelerated through a potential difference of 100 V is (in kg ms−1)
Answer» The linear momentum of an electron, initially at rest, accelerated through a potential difference of 100 V is (in kg $m s^{- 1}$ )

Discussion

31.	After a totally inelastic collision, two objects of the same masses and same initial speeds are found to move together at half of their initial speeds as shown in figure below. If α=30∘, then the angle between the initial velocities of the objects is
Answer» After a totally inelastic collision, two objects of the same masses and same initial speeds are found to move together at half of their initial speeds as shown in figure below. If $α = 30^{\circ}$ , then the angle between the initial velocities of the objects is

Discussion

32.	14. What is van't Hott factor? Derive it for non ideal solutions??
Answer» 14. What is van't Hott factor? Derive it for non ideal solutions??

Discussion

33.	The intensity of light I1 received by the emitter plate in Lenard's photoelectric set-up is changed by moving the source to twice the initial distance. What is the new intensity I2 received by the emitter plate?
Answer» The intensity of light $I_{1}$ received by the emitter plate in Lenard's photoelectric set-up is changed by moving the source to twice the initial distance. What is the new intensity $I_{2}$ received by the emitter plate?

Discussion

34.	The potential energy of a particle of mass m is given by U(x) = U(1 - cosax), where U, and a are constant. Time period of small oscillation of the particle is
Answer» The potential energy of a particle of mass m is given by U(x) = U(1 - cosax), where U, and a are constant. Time period of small oscillation of the particle is

Discussion

35.	Find the slope of the graph shown in the figure.Where:Vs→ stopping potential (V)f→ frequency of the incident radiation (Hz)
Answer» Find the slope of the graph shown in the figure. Where: $V_{s} \to$ stopping potential $(V)$ $f \to$ frequency of the incident radiation $(Hz)$

Discussion

36.	AU-shaped wire is dipped in a soap solution, and removed. The thinsoap film formed between the wire and the light slider supports aweight of 1.5 × 10–2N (which includes the small weight of the slider). The length of theslider is 30 cm. What is the surface tension of the film?
Answer» A U-shaped wire is dipped in a soap solution, and removed. The thin soap film formed between the wire and the light slider supports a weight of 1.5 × 10^–2 N (which includes the small weight of the slider). The length of the slider is 30 cm. What is the surface tension of the film?

Discussion

37.	Name the physical quantity which is (i) same (ii) different, in all the bulbs when three bulbs of:::::: (a) same wattage are connected in series(b) same wattage are connected in parallel (c)different wattage are connected in series (ddifferent wattage are connected in parallel
Answer» Name the physical quantity which is (i) same (ii) different, in all the bulbs when three bulbs of:::::: (a) same wattage are connected in series(b) same wattage are connected in parallel (c)different wattage are connected in series (ddifferent wattage are connected in parallel

Discussion

38.	Two cars move uniformly towards each other the distance them decrease as the rate 50m/s if they move in same direction with different speeds the distance between them increases at the rate 10m/s the speed of two cars will be
Answer» Two cars move uniformly towards each other the distance them decrease as the rate 50m/s if they move in same direction with different speeds the distance between them increases at the rate 10m/s the speed of two cars will be

Discussion

39.	An electric dipole is placed at the origin and is directed along X axis . At a point P , far away from dipole , the electric field is parallel to y axis . OP makes an angle theta with X axis 1). Tan theta =√32). Tan theta = √23). Theta = 454). Tan theta = 1/√2
Answer» An electric dipole is placed at the origin and is directed along X axis . At a point P , far away from dipole , the electric field is parallel to y axis . OP makes an angle theta with X axis 1). Tan theta =√3 2). Tan theta = √2 3). Theta = 45 4). Tan theta = 1/√2

Discussion

40.	Current flowing in a solenoid and a toroid is i and 4i respectively. If the number of turns per unit length is 3n and n respectively. Find the ratio of magnetic field inside the core due to solenoid and toroid.
Answer» Current flowing in a solenoid and a toroid is $i$ and $4 i$ respectively. If the number of turns per unit length is $3 n$ and $n$ respectively. Find the ratio of magnetic field inside the core due to solenoid and toroid.

Discussion

41.	If an object is vibrating at 10 hertz, what is its time period?
Answer» If an object is vibrating at 10 hertz, what is its time period?

Discussion

42.	A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N when the lift is stationary. If the lift moves downward with an acceleration of 5 m/s2, the reading of the spring balance will be (Take g=9.8 m/s2)
Answer» A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads $49 N$ when the lift is stationary. If the lift moves downward with an acceleration of $5 {m/s}^{2}$ , the reading of the spring balance will be (Take $g = 9.8 m / s^{2}$ )

Discussion

43.	An accelerometer has a seismic mass of 0.05 kg and a spring constant of 3×103N/m. The maximum permissible displacement of the mass is ±1mm. The maximum measurable acceleration in m/s2 is 60
Answer» An accelerometer has a seismic mass of 0.05 kg and a spring constant of $3 \times 10^{3} N / m .$ The maximum permissible displacement of the mass is $\pm 1 m m .$ The maximum measurable acceleration in $m / s^{2}$ is 60

Discussion

44.	With increase in temperature the frictional force acting between two surfaces A. Increases B decreases C remain same D unpredictable
Answer» With increase in temperature the frictional force acting between two surfaces A. Increases B decreases C remain same D unpredictable

Discussion

45.	A wooden block of mass 8 kg is tied to a string attached to the bottom of a tank. The block is completely inside the water. The tension in string is Relative density of wood is 0.8 and g 10 m/s2)
Answer» A wooden block of mass 8 kg is tied to a string attached to the bottom of a tank. The block is completely inside the water. The tension in string is Relative density of wood is 0.8 and g 10 m/s2)

Discussion

46.	If variation of position of a particle with time is denoted by y=Asinωt+Asin(ωt+2π3), thenMatch Column I with Column IIColumn IColumn II(A) Type of motion(p) SHM(B) Amplitude(q) A(C) Initial Phase(r)π3(D) Maximum velocity(s)Aω(t) Not SHM(u)2π3
Answer» If variation of position of a particle with time is denoted by $y = A sin ω t + A sin (ω t + \frac{2 π}{3})$ , then Match Column I with Column II $\begin{matrix} Column I & Column II (A) Type of motion & (p) SHM (B) Amplitude & (q) A (C) Initial Phase & (r) \frac{π}{3} (D) Maximum velocity & (s) A ω (t) Not SHM (u) \frac{2 π}{3} \end{matrix}$

Discussion

47.	With what velocity should a particle be projected upwards so that it reaches a height equal to radius of earth(R)?(Assume G = gravitational constant and M = mass of earth )
Answer» With what velocity should a particle be projected upwards so that it reaches a height equal to radius of earth $(R)$ ? (Assume $G$ = gravitational constant and $M$ = mass of earth )

Discussion

48.	a body thrown vertically upward with initial velocity 52m/s fro ground passes twice a point at h height above at an interval of 10s the height h is
Answer» a body thrown vertically upward with initial velocity 52m/s fro ground passes twice a point at h height above at an interval of 10s the height h is

Discussion

49.	In an α− decay, the kinetic energy ofα− particle is 48 MeV and Q value of the reaction is 50 MeV. The mass number of the mother nucleus is _____.(Assume that daughter nucleus is in ground state)
Answer» In an $α -$ decay, the kinetic energy of $α -$ particle is $48 MeV$ and $Q$ value of the reaction is $50 MeV$ . The mass number of the mother nucleus is _____. (Assume that daughter nucleus is in ground state)

Discussion

50.	a)Show that the normal component of electrostatic field has adiscontinuity from one side of a charged surface to anothergiven by (E2-E1).^n=σ/ϵwhere ˆn is a unit vector normal to the surface at a point ands is the surface charge density at that point. (The direction ofˆnis from side 1 to side 2.) Hence, show that just outside aconductor, the electric field is s ˆn /e0.b) Show that the tangential component of electrostatic field iscontinuous from one side of a charged surface to another. [Hint:For (a), use Gauss’s law. For, (b) use the fact that work done byelectrostatic field on a closed loop is zero.]
Answer» a)Show that the normal component of electrostatic field has adiscontinuity from one side of a charged surface to anothergiven by (E2-E1).^n=σ/ϵwhere ˆn is a unit vector normal to the surface at a point ands is the surface charge density at that point. (The direction ofˆnis from side 1 to side 2.) Hence, show that just outside aconductor, the electric field is s ˆn /e0.b) Show that the tangential component of electrostatic field iscontinuous from one side of a charged surface to another. [Hint:For (a), use Gauss’s law. For, (b) use the fact that work done byelectrostatic field on a closed loop is zero.]

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A wooden ball of density D is immersed in water of density d to a depth h below the surface of water and then released. Upto what height will the ball jump out of water( measured from surface of water) ?

A photon in motion has a mass

If the distance between the earth and the sun were half its present value, the number of days in a year would have been :

Two charges placed in air repel each other by a force of 10NN. When oil is introduced between the charges, the force becomes 2.5×10−5N. The dielectric constant of oil is

A beam of unpolarized light of intensity I0 is passed through a Polaroid A and then through another Polaroid B which is oriented so that its principal plane makes an angle of 45∘ relative to that of A.The intensity of the emergent light is I0x, Find the value of x.

44.Salon of gross weight W newton is falling vertically downward with a constant acceleration a(

A capacitor is charged with a battery and energy stored is U. After disconnecting the battery, another identical uncharged capacitor is connected in parallel with it. The energy stored in each capacitor is now

Two blocks A(3kg) and B(6kg) are connected by a spring of stiffness 200 N/m and plaInitially the spring has its equilibrium length. The indicated velocities are imparted to A(1m/s) and B(2m/s. The maximun extension of the spring will be

Applied AC voltage is given as, V=V0sin(ωt). Corresponding to this voltage, match the following two columns. Column I Column IIa. I=I0sin(ωt)b. I=−I0cos(ωt)c. I=I0sin(ωt+π/6) p. only R circuit q. only L circuitr. may be RC circuit

6.Name the electromagnetic unit and practical units of current . how they are related ?

the capaci†an ce of a parallel plate capacitor with air between the plates is 3μ f with the introduction of a dielectric medium between the plates the capaci†an ce becomes 15μ f the relative permittivity of the medium i

A block is moving on an inclined plane making an angle 45° with the horizontal and the coefficient of friction is μ. The force required to just push it up the inclined plane is 3 times the force required to just prevent it from sliding down. If we define N=10μ, then N is

A particle is moving along a straight-line path according to the relationS2=at2+2bt+cS represents the displacement covered in t seconds and a,b,c are constants. The acceleration of the particle varies as

An object slides without friction from the height 25 cm and then goes around the vertical loop of radius 10 cm from which a symmetrical section of angle 2α has been removed. Find the angle α such that after losing contact at A and flying through air, the object will reach point B.

The wavelength λe of an electron and λp of a photon of same energy E are related by -

A light wooden rod fixed at one end is kept horizontal. A load of 0.4 kg tied to the free end of the rod causes that end to be depressed by 2.8 cm . If this load is set into up and down vibrations, with what frequency(in Hz) will it oscillate?

In order to make an object float in a fluid. Its weight should be equal to

A small pulley of radius 30 cm and moment of inertia 0.72 kg m2 is used to hang a 2 kg mass with the help of massless string. If the block is released, what will be its acceleration for no slipping condition?

An electric circuit consists of four identical bulbs connected in parallel to a battery of 25 V. If one of the bulbs is fused and the electric current through each of the other bulbs is 2.3 A, what is the net electric current flowing in the circuit?

Consider a particle of mass m suspended vertically by a string at the equator. Let R and M denote the radius and the mass of the earth respectively. If ω is the angular velocity of earth's rotation about its own axis, the tension in the string is equal to

We have →F=4^i−3^j. Another vector that is perpendicular to →F is

A polythene piece rubbed with wool is found to have a negativecharge of 3 × 10–7 C. (a) Estimate the number of electrons transferred (from which towhich?) (b) Is there a transfer of mass from wool to polythene?

The angle of dip at a place is 37∘ and the vertical component of the earth's magnetic field is 6×10−5T. What is the earth's magnetic field at this place?

22. An alpha particle and proton enter a region of uniform magnetic field which is perpendicular to their direction of motion find ratio of radius of circle described by them if they 1.have same velocity 2.have same momentum 3.have same energy 4.are accelerated by same potential difference

A double slit is illuminated by light of wavelength 6000 ∘A. The slits are 0.1 cm apart and the screen is placed one meter away. Then the angular position of the 10th maximum in radian and separation of the two adjacent minima will be respectively

the specific heat of a gas is found to be 0.075 calories at constant volume and its formula wt is 40 .the atomicity of the gas would be1)one 2)two 3)three4)four

A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of 120 rev/min in a plane normal to the earth's magnetic field at the place. If the magnitude of the magnetic field is 0.4 G, what is the induced emf between the axle and the rim of the wheel ?

A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time t is proportional to (i) t⅟² (ii) t (iii) t³́² (iv) t²

The linear momentum of an electron, initially at rest, accelerated through a potential difference of 100 V is (in kg ms−1)

After a totally inelastic collision, two objects of the same masses and same initial speeds are found to move together at half of their initial speeds as shown in figure below. If α=30∘, then the angle between the initial velocities of the objects is

14. What is van't Hott factor? Derive it for non ideal solutions??

The intensity of light I1 received by the emitter plate in Lenard's photoelectric set-up is changed by moving the source to twice the initial distance. What is the new intensity I2 received by the emitter plate?

The potential energy of a particle of mass m is given by U(x) = U(1 - cosax), where U, and a are constant. Time period of small oscillation of the particle is

Find the slope of the graph shown in the figure.Where:Vs→ stopping potential (V)f→ frequency of the incident radiation (Hz)

AU-shaped wire is dipped in a soap solution, and removed. The thinsoap film formed between the wire and the light slider supports aweight of 1.5 × 10–2N (which includes the small weight of the slider). The length of theslider is 30 cm. What is the surface tension of the film?

Name the physical quantity which is (i) same (ii) different, in all the bulbs when three bulbs of:::::: (a) same wattage are connected in series(b) same wattage are connected in parallel (c)different wattage are connected in series (ddifferent wattage are connected in parallel

Two cars move uniformly towards each other the distance them decrease as the rate 50m/s if they move in same direction with different speeds the distance between them increases at the rate 10m/s the speed of two cars will be

An electric dipole is placed at the origin and is directed along X axis . At a point P , far away from dipole , the electric field is parallel to y axis . OP makes an angle theta with X axis 1). Tan theta =√32). Tan theta = √23). Theta = 454). Tan theta = 1/√2

Current flowing in a solenoid and a toroid is i and 4i respectively. If the number of turns per unit length is 3n and n respectively. Find the ratio of magnetic field inside the core due to solenoid and toroid.

If an object is vibrating at 10 hertz, what is its time period?

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N when the lift is stationary. If the lift moves downward with an acceleration of 5 m/s2, the reading of the spring balance will be (Take g=9.8 m/s2)

An accelerometer has a seismic mass of 0.05 kg and a spring constant of 3×103N/m. The maximum permissible displacement of the mass is ±1mm. The maximum measurable acceleration in m/s2 is 60

With increase in temperature the frictional force acting between two surfaces A. Increases B decreases C remain same D unpredictable

A wooden block of mass 8 kg is tied to a string attached to the bottom of a tank. The block is completely inside the water. The tension in string is Relative density of wood is 0.8 and g 10 m/s2)

If variation of position of a particle with time is denoted by y=Asinωt+Asin(ωt+2π3), thenMatch Column I with Column IIColumn IColumn II(A) Type of motion(p) SHM(B) Amplitude(q) A(C) Initial Phase(r)π3(D) Maximum velocity(s)Aω(t) Not SHM(u)2π3

With what velocity should a particle be projected upwards so that it reaches a height equal to radius of earth(R)?(Assume G = gravitational constant and M = mass of earth )

a body thrown vertically upward with initial velocity 52m/s fro ground passes twice a point at h height above at an interval of 10s the height h is

In an α− decay, the kinetic energy ofα− particle is 48 MeV and Q value of the reaction is 50 MeV. The mass number of the mother nucleus is _____.(Assume that daughter nucleus is in ground state)