50278 + Interview Questions in Physics

1.	∫(x−1)ex(x+1)3dx=
Answer» $\int \frac{(x - 1) e^{x}}{(x + 1)^{3}} d x =$

Discussion

2.	From a point on the ground 100 m away from the base of a building, the angle of elevation of the top of the building is 60° Which of the following is the best approximation for the height of the building?
Answer» From a point on the ground $100 m$ away from the base of a building, the angle of elevation of the top of the building is $60 °$ Which of the following is the best approximation for the height of the building?

Discussion

3.	A particle having a charge of 2.0×10−8 C and a mass of 2.0×10−10 g is projected with a speed of 2.0×103 m s−1 in a region having a uniform magnetic field of 0.10 T. The velocity is perpendicular to the field. Find the radius of the circle formed by the particle and also the time period.
Answer» A particle having a charge of $2.0 \times 10^{- 8}$ C and a mass of $2.0 \times 10^{- 10}$ g is projected with a speed of $2.0 \times 10^{3}$ m $s^{- 1}$ in a region having a uniform magnetic field of 0.10 T. The velocity is perpendicular to the field. Find the radius of the circle formed by the particle and also the time period.

Discussion

4.	what is Microscope what is its applications how it works on what is its principles
Answer» what is Microscope what is its applications how it works on what is its principles

Discussion

5.	Three charged particles are moving along the circular path by forming an equilateral triangle. Find i) Velocity of revolution ii) Time period of revolution.
Answer» Three charged particles are moving along the circular path by forming an equilateral triangle. Find i) Velocity of revolution ii) Time period of revolution.

Discussion

6.	A stretched string is forced to transmit transverse waves by means of an oscillator coupled to one end. The string has a diameter of 4mm. The amplitude of the oscillation is 10−4m and the frequency is 10 Hz. Tension in the string is 100 N and mass density of wire is 4.2×103 kg/m3 . Find :
Answer» A stretched string is forced to transmit transverse waves by means of an oscillator coupled to one end. The string has a diameter of 4mm. The amplitude of the oscillation is $10^{- 4} m$ and the frequency is 10 Hz. Tension in the string is 100 N and mass density of wire is $4.2 \times 10^{3} k g / m^{3}$ . Find :

Discussion

7.	A steel ball is dropped from a building's roof and passes a window, taking 1s to fall from the top to the window to the bottom of the window, a distance of 10m. It then falls to a sidewalk and bounces back past the window, moving from bottom to top in 1s. Assume that the upward flight is an exact reverse of the fall. The time the ball spends below the bottom of the window is 2s. How tall is the building?
Answer» A steel ball is dropped from a building's roof and passes a window, taking 1s to fall from the top to the window to the bottom of the window, a distance of 10m. It then falls to a sidewalk and bounces back past the window, moving from bottom to top in 1s. Assume that the upward flight is an exact reverse of the fall. The time the ball spends below the bottom of the window is 2s. How tall is the building?

Discussion

8.	i current flows through a circuit when 10 cells are connected in series. How many same cells should be connected in parallel to get the same current
Answer» i current flows through a circuit when 10 cells are connected in series. How many same cells should be connected in parallel to get the same current

Discussion

9.	For the reaction A + B → C; starting with different initial concentration of A and B, initial rate of reaction were determined graphically in four experiments. Sl.No[A]0/M(Initial conc.)[B]0/M(Initial conc.)Rate/(M sec−1)1.1.6×10−35×10−210−32.3.2×10−35×10−24×10−33.1.6×10−310−12×10−34.3.2×10−310−18×10−3 Rate law for reaction from above data is
Answer» For the reaction A + B $\to$ C; starting with different initial concentration of A and B, initial rate of reaction were determined graphically in four experiments. $\begin{matrix} S l . N o & [A]_{0} / M (I n i t i a l c o n c .) & [B]_{0} / M (I n i t i a l c o n c .) & R a t e / (M s e c^{- 1}) 1. & 1.6 \times 10^{- 3} & 5 \times 10^{- 2} & 10^{- 3} 2. & 3.2 \times 10^{- 3} & 5 \times 10^{- 2} & 4 \times 10^{- 3} 3. & 1.6 \times 10^{- 3} & 10^{- 1} & 2 \times 10^{- 3} 4. & 3.2 \times 10^{- 3} & 10^{- 1} & 8 \times 10^{- 3} \end{matrix}$ Rate law for reaction from above data is

Discussion

10.	If in the infinite series circuit, C = 9 μF and C1=6μF then the capacity across AB is
Answer» If in the infinite series circuit, C = 9 $μ$ F and $C_{1} = 6 μ F$ then the capacity across AB is

Discussion

11.	An object A is moving towards a converging lens as shown in the figure. If object is moving with speed 5 m/s, find the average velocity of image in next 4 seconds.
Answer» An object A is moving towards a converging lens as shown in the figure. If object is moving with speed $5 m/s$ , find the average velocity of image in next 4 seconds.

Discussion

12.	The number of ordered pairs (x,y) of real numbers satisfying 4x2−4x+2=sin2y and x2+y2≤3 will be
Answer» The number of ordered pairs $(x, y)$ of real numbers satisfying $4 x^{2} - 4 x + 2 = {sin}^{2} y$ and $x^{2} + y^{2} \leq 3$ will be

Discussion

13.	A body of 1 kg is thrown vertically upwards with an initial velocity (u)=2 m/s, the height at which kinetic energy of the body is (14)th of its original value is (take g=10 m/s2)
Answer» A body of $1 kg$ is thrown vertically upwards with an initial velocity $(u) = 2 m/s$ , the height at which kinetic energy of the body is $(\frac{1}{4})^{th}$ of its original value is (take $g = 10 {m/s}^{2}$ )

Discussion

14.	An open flask containing air is heated from 27∘C to 127∘C K. What percentage of air will escape if the pressure is kept constant?
Answer» An open flask containing air is heated from $27^{\circ} C$ to $127^{\circ} C$ K. What percentage of air will escape if the pressure is kept constant?

Discussion

15.	A metal rod, fixed at both ends, has a length l,area of cross section A and youngs modulus Y and coefficient of linear expansion α is heated through t0 C. The work done in heating the rod is
Answer» A metal rod, fixed at both ends, has a length $l$ ,area of cross section $A$ and youngs modulus $Y$ and coefficient of linear expansion $α$ is heated through $t^{0} C$ . The work done in heating the rod is

Discussion

16.	P is a point on the axis of a ring with Centre O and radius 0.1m. The ring is uniformly charged with linear charge density 0.5 c/m. Given OP = 0.1 m, the electric field at P is approximately ten to the power ___in SI units.
Answer» P is a point on the axis of a ring with Centre O and radius 0.1m. The ring is uniformly charged with linear charge density 0.5 c/m. Given OP = 0.1 m, the electric field at P is approximately ten to the power ___in SI units.

Discussion

17.	Which of these were the drawbacks of Rutherford's model.
Answer» Which of these were the drawbacks of Rutherford's model.

Discussion

18.	Given a point source of light, which of the following can produce a parallel beam of light [CPMT 1974; KCET
Answer» Given a point source of light, which of the following can produce a parallel beam of light [CPMT 1974; KCET

Discussion

19.	In planetary motion the areal velocity of position vector of a planet depends on angular velocity (ω) and the distance of the planet from sun (r). If so the correct relation for areal velocity is
Answer» In planetary motion the areal velocity of position vector of a planet depends on angular velocity $(ω)$ and the distance of the planet from sun (r). If so the correct relation for areal velocity is

Discussion

20.	A block of mass m moves on a horizontal circle against the wall of a cylindrical room of radius R. The floor of the room oil which the block MC/Veil so smooth but the friction coefficient between the wall and the block is p. The block is given an initial speed V0. As a function of the speed v write (a) the normal force by the wall on the block, (b) the frictional force by the wall and (c) the tangential acceleration of the block. (d) Integrate the tangential acceleration (dvdt=vdvdt) to obtain the speed of the block after one revolution.
Answer» A block of mass m moves on a horizontal circle against the wall of a cylindrical room of radius R. The floor of the room oil which the block MC/Veil so smooth but the friction coefficient between the wall and the block is p. The block is given an initial speed $V_{0}$ . As a function of the speed v write (a) the normal force by the wall on the block, (b) the frictional force by the wall and (c) the tangential acceleration of the block. (d) Integrate the tangential acceleration $(\frac{d v}{d t} = v \frac{d v}{d t})$ to obtain the speed of the block after one revolution.

Discussion

21.	The time period of a body in SHM is represented by To=PaρbSc, where P is pressure, ρ is density and S is surface tension. The value of a,b and c respectively for the relation to be dimensionally correct is
Answer» The time period of a body in $S H M$ is represented by $T_{o} = P^{a} ρ^{b} S^{c}$ , where $P$ is pressure, $ρ$ is density and $S$ is surface tension. The value of $a, b$ and $c$ respectively for the relation to be dimensionally correct is

Discussion

22.	Arrange the following electromagnetic wave in the order of their increasing wavelength: (a) γ-rays (b) Microwaves (c) X-rays (d) Radio waves How are infra-red waves produced? What role does infra-red radiation play in (i) maintain the Earth’s warmth and (ii) physical therapy?
Answer» Arrange the following electromagnetic wave in the order of their increasing wavelength: (a) $γ$ -rays (b) Microwaves (c) X-rays (d) Radio waves How are infra-red waves produced? What role does infra-red radiation play in (i) maintain the Earth’s warmth and (ii) physical therapy?

22.

Arrange the following electromagnetic wave in the order of their increasing wavelength: (a) γ-rays (b) Microwaves (c) X-rays (d) Radio waves How are infra-red waves produced? What role does infra-red radiation play in (i) maintain the Earth’s warmth and (ii) physical therapy?

Answer»

Arrange the following electromagnetic wave in the order of their increasing wavelength:

(a) $γ$ -rays

(b) Microwaves

(c) X-rays

(d) Radio waves

How are infra-red waves produced? What role does infra-red radiation play in (i) maintain the Earth’s warmth and (ii) physical therapy?

Discussion

23.	Two particles move parallel to x-axis about the origin with same amplitude ‘a’ and frequency ω. At a certain instant they are found at a distance a/3 from the origin on opposite sides but their velocities are in the same direction. The phase difference between the two particles is..
Answer» Two particles move parallel to x-axis about the origin with same amplitude ‘a’ and frequency $ω$ . At a certain instant they are found at a distance a/3 from the origin on opposite sides but their velocities are in the same direction. The phase difference between the two particles is..

Discussion

24.	A sinusoidal wave of amplitude 5 cm is to be transmitted along a string having a linear mass density of 4×10−2 kg/m. If the source can be deliver an average power of 90 watts and string is under a tension of 100 N, then the frequency at which the source operates is [Take π2=10]
Answer» A sinusoidal wave of amplitude $5 cm$ is to be transmitted along a string having a linear mass density of $4 \times 10^{- 2} kg/m$ . If the source can be deliver an average power of $90 watts$ and string is under a tension of $100 N$ , then the frequency at which the source operates is [Take $π^{2} = 10$ ]

Discussion

25.	A uniform ring of mass ‘m’ and radius ‘a’ is placed directly above a uniform sphere of mass ‘M’ and of equal radius. The centre of the ring is at a distance √3a from the centre of the sphere. The gravitational force exerted by the sphere on the ring is
Answer» A uniform ring of mass ‘m’ and radius ‘a’ is placed directly above a uniform sphere of mass ‘M’ and of equal radius. The centre of the ring is at a distance $\sqrt{3} a$ from the centre of the sphere. The gravitational force exerted by the sphere on the ring is

Discussion

26.	A spherical shell at rest at the origin explodes into three fragments of masses 1 kg, 2 kg and 'm' kg. The 1 kg and 2 kg pieces fly off with speeds of 12ms−1 along the x-axis and 8 ms−1 along the y-axis respectively. If the 'm' kg piece flies off with a speed of 40 ms−1 , the total mass of the shell must be
Answer» A spherical shell at rest at the origin explodes into three fragments of masses 1 kg, 2 kg and 'm' kg. The 1 kg and 2 kg pieces fly off with speeds of $12 m s^{- 1}$ along the x-axis and 8 $m s^{- 1}$ along the y-axis respectively. If the 'm' kg piece flies off with a speed of 40 $m s^{- 1}$ , the total mass of the shell must be

Discussion

27.	The approximated epth of an ocean is 2700m.Thecompressibilityofwateris 45.4 × 10-11Pa−1 and density of water is 103kg/m3.What fractional compression of water will be obtained at the bottom of the ocean?
Answer» The approximated epth of an ocean is 2700m.Thecompressibilityofwateris 45.4 $\times$ 10-11P $a^{- 1}$ and density of water is $10^{3} k g / m^{3}$ .What fractional compression of water will be obtained at the bottom of the ocean?

Discussion

28.	In a capacitor charging unit, let Q1 be the charge given to the capacitor in a time interval Δt and Q2 be the charge given in the next equal time inertial Δt. In the same unit, let charge Δqbe deposited in a time interval t1 and the next equal charge Δq be deposited in a time interval t2, then.
Answer» In a capacitor charging unit, let $Q_{1}$ be the charge given to the capacitor in a time interval $Δ t$ and $Q_{2}$ be the charge given in the next equal time inertial $Δ t$ . In the same unit, let charge $Δ q$ be deposited in a time interval $t_{1}$ and the next equal charge $Δ q$ be deposited in a time interval $t_{2}$ , then.

Discussion

29.	Distance of the centre of mass of a solid uniform cone from its vertex is z0. If the radius of its base is R and its height is h, then z0 is equal to.
Answer» Distance of the centre of mass of a solid uniform cone from its vertex is $z_{0}$ . If the radius of its base is $R$ and its height is $h$ , then $z_{0}$ is equal to.

Discussion

30.	A ball of mass m moving at a speed v makes a head-on collision with an identical ball at rest. The kinetic energy of the ball after the collision is three-fourths of the original. Find the coefficient of restitution.
Answer» A ball of mass m moving at a speed v makes a head-on collision with an identical ball at rest. The kinetic energy of the ball after the collision is three-fourths of the original. Find the coefficient of restitution.

Discussion

31.	The distance travelled by a body falling freely from rest in 2nd, 3rd and 5th second of its motion are in the ratio
Answer» The distance travelled by a body falling freely from rest in $2^{n d}, 3^{r d}$ and $5^{t h}$ second of its motion are in the ratio

Discussion

32.	Match the graphs between the following variables with their names. GraphsNamesA. pressure vs temperature graph at1. Isothermsconstant molar volumeB. Pressure vs volume graph at2. Constant temperature curveconstant temperatureC. Volume vs temperature graph at3. Isochoresconstant pressure4. Isobars
Answer» Match the graphs between the following variables with their names. $\begin{matrix} G r a p h s & N a m e s A . & p r e s s u r e v s t e m p e r a t u r e g r a p h a t & 1. I s o t h e r m s c o n s t a n t m o l a r v o l u m e B . & P r e s s u r e v s v o l u m e g r a p h a t & 2. C o n s t a n t t e m p e r a t u r e c u r v e c o n s t a n t t e m p e r a t u r e C . & V o l u m e v s t e m p e r a t u r e g r a p h a t & 3. I s o c h o r e s c o n s t a n t p r e s s u r e 4. I s o b a r s \end{matrix}$

32.

Match the graphs between the following variables with their names. GraphsNamesA. pressure vs temperature graph at1. Isothermsconstant molar volumeB. Pressure vs volume graph at2. Constant temperature curveconstant temperatureC. Volume vs temperature graph at3. Isochoresconstant pressure4. Isobars

Answer»

Match the graphs between the following variables with their names.

$\begin{matrix} G r a p h s & N a m e s A . & p r e s s u r e v s t e m p e r a t u r e g r a p h a t & 1. I s o t h e r m s c o n s t a n t m o l a r v o l u m e B . & P r e s s u r e v s v o l u m e g r a p h a t & 2. C o n s t a n t t e m p e r a t u r e c u r v e c o n s t a n t t e m p e r a t u r e C . & V o l u m e v s t e m p e r a t u r e g r a p h a t & 3. I s o c h o r e s c o n s t a n t p r e s s u r e 4. I s o b a r s \end{matrix}$

Discussion

33.	Two rods of length L2 and coefficient of linear expansion α2 are connected freely to a third rod of length L1 of coefficient of linear expansion α1 to form an isosceles triangle. The arrangement is supported on the knife edge at the midpoint of rod of length L1, which is horizontal. The apex of the isosceles triangle remains at a constant distance from the knife edge, if L1L2=n(α2α1)12. Then value of n is
Answer» Two rods of length $L_{2}$ and coefficient of linear expansion $α_{2}$ are connected freely to a third rod of length $L_{1}$ of coefficient of linear expansion $α_{1}$ to form an isosceles triangle. The arrangement is supported on the knife edge at the midpoint of rod of length $L_{1},$ which is horizontal. The apex of the isosceles triangle remains at a constant distance from the knife edge, if $\frac{L_{1}}{L_{2}} = n {(\frac{α_{2}}{α_{1}})}^{\frac{1}{2}}$ . Then value of $n$ is

Discussion

34.	A time dependent force F=6t acts on a particle of mass 1kg. If the particle starts from rest, the work done by the force during the first 1 sec will be
Answer» A time dependent force $F = 6 t$ acts on a particle of mass $1 k g$ . If the particle starts from rest, the work done by the force during the first 1 sec will be

Discussion

35.	A soap film is made by dipping a circular frame of radius b in soap solution. A bubble is formed by blowing air with speed v in a cylindrical column. The radius of the bubble formed R>>b. If the air is incident normally on the surface of the bubble and air stops after striking the surface, then the radius R of the bubble when the soap bubble separates from the ring is: (Surface tension of liquid is S and density of air is ρ)
Answer» A soap film is made by dipping a circular frame of radius $b$ in soap solution. A bubble is formed by blowing air with speed $v$ in a cylindrical column. The radius of the bubble formed $R >> b$ . If the air is incident normally on the surface of the bubble and air stops after striking the surface, then the radius $R$ of the bubble when the soap bubble separates from the ring is: (Surface tension of liquid is $S$ and density of air is $ρ$ )

Discussion

36.	In the given figure, the focal length of the two mirrors M−1 and M−2 for the given incident rays are f1 and f2 respectively, then
Answer» In the given figure, the focal length of the two mirrors $M - 1$ and $M - 2$ for the given incident rays are $f_{1}$ and $f_{2}$ respectively, then

Discussion

37.	A tree increases annually by 18th of its height. By how much will it increase after 52 years, if it stands today 10 ft. today?
Answer» A tree increases annually by ${\frac{1}{8}}^{t h}$ of its height. By how much will it increase after $\frac{5}{2}$ years, if it stands today 10 ft. today?

Discussion

38.	A steel ring of 3.000 inch inside diameter at 200C is to be heated and slipped over a brass shaft measuring 3.002 inch in diameter at 200 C. To what temperature should the ring be heated? (αsteel= 1.1 ×10-50C-1)
Answer» A steel ring of 3.000 inch inside diameter at 20⁰C is to be heated and slipped over a brass shaft measuring 3.002 inch in diameter at 20⁰ C. To what temperature should the ring be heated? (α_steel= 1.1 ×10^-50C^-1)

Discussion

39.	A charge q is moved from point A to point B in the electric field of a uniformly charged ring of radius R and charge Q which is placed in exactly at the centre of AB. Find the work done by the agent.
Answer» A charge q is moved from point A to point B in the electric field of a uniformly charged ring of radius R and charge Q which is placed in exactly at the centre of AB. Find the work done by the agent.

39.

A charge q is moved from point A to point B in the electric field of a uniformly charged ring of radius R and charge Q which is placed in exactly at the centre of AB. Find the work done by the agent.

Answer»

A charge q is moved from point A to point B in the electric field of a uniformly charged ring of radius R and charge Q which is placed in exactly at the centre of AB. Find the work done by the agent.

Discussion

40.	When a monochromatic source of light is at a distance of 0.2 m from a photocell, the stopping potential (cut off voltage) and the saturation current are found to be 1 volt and 27 mA respectively. If the same source is placed at a distance 0.6 m from the cell then
Answer» When a monochromatic source of light is at a distance of 0.2 m from a photocell, the stopping potential (cut off voltage) and the saturation current are found to be 1 volt and 27 mA respectively. If the same source is placed at a distance 0.6 m from the cell then

Discussion

41.	Three rods of same material, same area of cross-section but different lengths 10 cm, 20 cm and 30 cm are connected at a point as shown in the figure. Find the temperature of junction ′O′.
Answer» Three rods of same material, same area of cross-section but different lengths $10 cm$ , $20 cm$ and $30 cm$ are connected at a point as shown in the figure. Find the temperature of junction $^{'} O^{'}$ .

Discussion

42.	A disc of radius R uniformly charged with a charge Q is rotated at angular velocity ′ω′ about an axis passing through its center and perpendicular to plane disc. Net magnetic field at center of disc is.
Answer» A disc of radius $R$ uniformly charged with a charge $Q$ is rotated at angular velocity $^{'} ω^{'}$ about an axis passing through its center and perpendicular to plane disc. Net magnetic field at center of disc is.

Discussion

43.	For the situation shown in the figure (r >> length of dipole) mark out the correct statement(s).
Answer» For the situation shown in the figure (r >> length of dipole) mark out the correct statement(s).

43.

For the situation shown in the figure (r >> length of dipole) mark out the correct statement(s).

Answer»

For the situation shown in the figure (r >> length of dipole) mark out the correct statement(s).

Discussion

44.	If the length of the string between the bridges of a sonometer wire is changed by a small amount , the fractional change Δffin the fundamental frequency is
Answer» If the length of the string between the bridges of a sonometer wire is changed by a small amount , the fractional change $\frac{Δ f}{f}$ in the fundamental frequency is

Discussion

45.	A transverse wave is passing through a light string shown in the figure. The equation of wave is y = A sin(ωt–kx). The area of cross section of string is ‘A’ and density is ‘ρ’. The hanging mass is:
Answer» A transverse wave is passing through a light string shown in the figure. The equation of wave is y = $A s i n (ω t - k x)$ . The area of cross section of string is ‘A’ and density is ‘ $ρ$ ’. The hanging mass is:

Discussion

46.	wo particles A and B are placed as shown in the figure. The particle A, on the top of tower, is projected horizontally with a velocity u and the B is projected along the surface towards the tower simultaneously. If particles meet each other, then the speed of projection of particle B is [Ignore friction]
Answer» wo particles A and B are placed as shown in the figure. The particle A, on the top of tower, is projected horizontally with a velocity u and the B is projected along the surface towards the tower simultaneously. If particles meet each other, then the speed of projection of particle B is [Ignore friction]

Discussion

47.	Displacement is a vector quantity because it has both ___ and ___ .
Answer» Displacement is a vector quantity because it has both ___ and ___ .

Discussion

48.	A coil made of Copper wire having radius r, self inductance L is bent in two concentric turns each having radius r2 . The new self inductance is
Answer» A coil made of Copper wire having radius $r$ , self inductance $L$ is bent in two concentric turns each having radius $\frac{r}{2}$ . The new self inductance is

Discussion

49.	Equal torsional torques act on two rods x and y having equal length. The diameter of rod y is twice the diameter of rod x. If θx and θy are the angle of twist, then θxθy=
Answer» Equal torsional torques act on two rods $x$ and $y$ having equal length. The diameter of rod $y$ is twice the diameter of rod $x$ . If $θ_{x}$ and $θ_{y}$ are the angle of twist, then $\frac{θ_{x}}{θ_{y}} =$

Discussion

50.	A container is filled with 20 mole of an ideal diatomic gas at absolute temperature T. When heat is supplied to it, the temperature remain constant but 8 mole of the gas disassociates into atoms. The heat energy supplied to the gas is
Answer» A container is filled with $20 mole$ of an ideal diatomic gas at absolute temperature $T$ . When heat is supplied to it, the temperature remain constant but $8 mole$ of the gas disassociates into atoms. The heat energy supplied to the gas is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

∫(x−1)ex(x+1)3dx=

From a point on the ground 100 m away from the base of a building, the angle of elevation of the top of the building is 60° Which of the following is the best approximation for the height of the building?

A particle having a charge of 2.0×10−8 C and a mass of 2.0×10−10 g is projected with a speed of 2.0×103 m s−1 in a region having a uniform magnetic field of 0.10 T. The velocity is perpendicular to the field. Find the radius of the circle formed by the particle and also the time period.

what is Microscope what is its applications how it works on what is its principles

Three charged particles are moving along the circular path by forming an equilateral triangle. Find i) Velocity of revolution ii) Time period of revolution.

A stretched string is forced to transmit transverse waves by means of an oscillator coupled to one end. The string has a diameter of 4mm. The amplitude of the oscillation is 10−4m and the frequency is 10 Hz. Tension in the string is 100 N and mass density of wire is 4.2×103 kg/m3 ​. Find :

i current flows through a circuit when 10 cells are connected in series. How many same cells should be connected in parallel to get the same current

If in the infinite series circuit, C = 9 μF and C1=6μF then the capacity across AB is

An object A is moving towards a converging lens as shown in the figure. If object is moving with speed 5 m/s, find the average velocity of image in next 4 seconds.

The number of ordered pairs (x,y) of real numbers satisfying 4x2−4x+2=sin2y and x2+y2≤3 will be

A body of 1 kg is thrown vertically upwards with an initial velocity (u)=2 m/s, the height at which kinetic energy of the body is (14)th of its original value is (take g=10 m/s2)

An open flask containing air is heated from 27∘C to 127∘C K. What percentage of air will escape if the pressure is kept constant?

A metal rod, fixed at both ends, has a length l,area of cross section A and youngs modulus Y and coefficient of linear expansion α is heated through t0 C. The work done in heating the rod is

P is a point on the axis of a ring with Centre O and radius 0.1m. The ring is uniformly charged with linear charge density 0.5 c/m. Given OP = 0.1 m, the electric field at P is approximately ten to the power ___in SI units.

Which of these were the drawbacks of Rutherford's model.

Given a point source of light, which of the following can produce a parallel beam of light [CPMT 1974; KCET

In planetary motion the areal velocity of position vector of a planet depends on angular velocity (ω) and the distance of the planet from sun (r). If so the correct relation for areal velocity is

The time period of a body in SHM is represented by To=PaρbSc, where P is pressure, ρ is density and S is surface tension. The value of a,b and c respectively for the relation to be dimensionally correct is

Arrange the following electromagnetic wave in the order of their increasing wavelength: (a) γ-rays (b) Microwaves (c) X-rays (d) Radio waves How are infra-red waves produced? What role does infra-red radiation play in (i) maintain the Earth’s warmth and (ii) physical therapy?

Two particles move parallel to x-axis about the origin with same amplitude ‘a’ and frequency ω. At a certain instant they are found at a distance a/3 from the origin on opposite sides but their velocities are in the same direction. The phase difference between the two particles is..

A sinusoidal wave of amplitude 5 cm is to be transmitted along a string having a linear mass density of 4×10−2 kg/m. If the source can be deliver an average power of 90 watts and string is under a tension of 100 N, then the frequency at which the source operates is [Take π2=10]

A uniform ring of mass ‘m’ and radius ‘a’ is placed directly above a uniform sphere of mass ‘M’ and of equal radius. The centre of the ring is at a distance √3a from the centre of the sphere. The gravitational force exerted by the sphere on the ring is

The approximated epth of an ocean is 2700m.Thecompressibilityofwateris 45.4 × 10-11Pa−1 and density of water is 103kg/m3.What fractional compression of water will be obtained at the bottom of the ocean?

In a capacitor charging unit, let Q1 be the charge given to the capacitor in a time interval Δt and Q2 be the charge given in the next equal time inertial Δt. In the same unit, let charge Δqbe deposited in a time interval t1 and the next equal charge Δq be deposited in a time interval t2, then.

Distance of the centre of mass of a solid uniform cone from its vertex is z0. If the radius of its base is R and its height is h, then z0 is equal to.

A ball of mass m moving at a speed v makes a head-on collision with an identical ball at rest. The kinetic energy of the ball after the collision is three-fourths of the original. Find the coefficient of restitution.

The distance travelled by a body falling freely from rest in 2nd, 3rd and 5th second of its motion are in the ratio

Match the graphs between the following variables with their names. GraphsNamesA. pressure vs temperature graph at1. Isothermsconstant molar volumeB. Pressure vs volume graph at2. Constant temperature curveconstant temperatureC. Volume vs temperature graph at3. Isochoresconstant pressure4. Isobars

A time dependent force F=6t acts on a particle of mass 1kg. If the particle starts from rest, the work done by the force during the first 1 sec will be

In the given figure, the focal length of the two mirrors M−1 and M−2 for the given incident rays are f1 and f2 respectively, then

A tree increases annually by 18th of its height. By how much will it increase after 52 years, if it stands today 10 ft. today?

A steel ring of 3.000 inch inside diameter at 200C is to be heated and slipped over a brass shaft measuring 3.002 inch in diameter at 200 C. To what temperature should the ring be heated? (αsteel= 1.1 ×10-50C-1)

A charge q is moved from point A to point B in the electric field of a uniformly charged ring of radius R and charge Q which is placed in exactly at the centre of AB. Find the work done by the agent.

When a monochromatic source of light is at a distance of 0.2 m from a photocell, the stopping potential (cut off voltage) and the saturation current are found to be 1 volt and 27 mA respectively. If the same source is placed at a distance 0.6 m from the cell then

Three rods of same material, same area of cross-section but different lengths 10 cm, 20 cm and 30 cm are connected at a point as shown in the figure. Find the temperature of junction ′O′.

A disc of radius R uniformly charged with a charge Q is rotated at angular velocity ′ω′ about an axis passing through its center and perpendicular to plane disc. Net magnetic field at center of disc is.

For the situation shown in the figure (r &gt;&gt; length of dipole) mark out the correct statement(s).

If the length of the string between the bridges of a sonometer wire is changed by a small amount , the fractional change Δffin the fundamental frequency is

A transverse wave is passing through a light string shown in the figure. The equation of wave is y = A sin(ωt–kx). The area of cross section of string is ‘A’ and density is ‘ρ’. The hanging mass is:

Displacement is a vector quantity because it has both ___ and ___ .

A coil made of Copper wire having radius r, self inductance L is bent in two concentric turns each having radius r2 . The new self inductance is

Equal torsional torques act on two rods x and y having equal length. The diameter of rod y is twice the diameter of rod x. If θx and θy are the angle of twist, then θxθy=

A container is filled with 20 mole of an ideal diatomic gas at absolute temperature T. When heat is supplied to it, the temperature remain constant but 8 mole of the gas disassociates into atoms. The heat energy supplied to the gas is

A stretched string is forced to transmit transverse waves by means of an oscillator coupled to one end. The string has a diameter of 4mm. The amplitude of the oscillation is 10−4m and the frequency is 10 Hz. Tension in the string is 100 N and mass density of wire is 4.2×103 kg/m3 . Find :

For the situation shown in the figure (r >> length of dipole) mark out the correct statement(s).

Displacement is a vector quantity because it has both _ and _ .