50278 + Interview Questions in Physics Page 153 InterviewSolution

7601.	An object is placed at a distance of 40 cm in front of a concave mirror of focal length 15 cm. Where a screen should be placed in order to obtain a sharp image?
Answer» An object is placed at a distance of 40 cm in front of a concave mirror of focal length 15 cm. Where a screen should be placed in order to obtain a sharp image?

Discussion

7602.	19.Three waves Y1 = asin(wt-kx), Y2 = Asin(wt-kx+h) and Y3 = Asin(wt-kx+2h) are superimposed so that Y1+Y2+Y3 = 0 at all positions. Then the value of h is
Answer» 19.Three waves Y1 = asin(wt-kx), Y2 = Asin(wt-kx+h) and Y3 = Asin(wt-kx+2h) are superimposed so that Y1+Y2+Y3 = 0 at all positions. Then the value of h is

Discussion

7603.	Two bodies P and Q have thermal emissivities of ϵP and ϵQ respectively. Surface areas of these bodies are same and the total radiant power is also emitted at the same rate. If temperature of P is θP kelvin then temperature of Q i.e. θQ is equal to
Answer» Two bodies $P$ and $Q$ have thermal emissivities of $ϵ_{P}$ and $ϵ_{Q}$ respectively. Surface areas of these bodies are same and the total radiant power is also emitted at the same rate. If temperature of $P$ is $θ_{P}$ kelvin then temperature of $Q$ i.e. $θ_{Q}$ is equal to

Discussion

7604.	The potential energy of a 4 kg particle free to move along the x− axis is given by U(x)=x33−5x22+6x+3Total mechanical energy of the particle is 17 J. Then the maximum kinetic energy in joules is
Answer» The potential energy of a $4 kg$ particle free to move along the $x -$ axis is given by $U (x) = \frac{x^{3}}{3} - \frac{5 x^{2}}{2} + 6 x + 3$ Total mechanical energy of the particle is $17 J$ . Then the maximum kinetic energy in joules is

Discussion

7605.	An electron moving with speed v and a photon, moving with speed c, have the same de-Broglie wavelength. The ratio of kinetic energy of electron to that of photon is :
Answer» An electron moving with speed $v$ and a photon, moving with speed $c$ , have the same de-Broglie wavelength. The ratio of kinetic energy of electron to that of photon is :

Discussion

7606.	Four identical hollow cylindrical columns of mild steel support a big structure of mass 50×103 kg. The inner and outer radii of each column are 50 cm and 100 cm respectively. Assuming uniform local distribution, calculate the compression strain of each column.[use Y=2.0×1011 Pa,g=9.8 m/s2]
Answer» Four identical hollow cylindrical columns of mild steel support a big structure of mass $50 \times 10^{3} kg .$ The inner and outer radii of each column are $50 cm$ and $100 cm$ respectively. Assuming uniform local distribution, calculate the compression strain of each column. $[use Y = 2.0 \times 10^{11} Pa, g = 9.8 {m/s}^{2}]$

Discussion

7607.	Electric charges having same magnitude ofcharge 'q' coulombs are placed at x 14 m, 8so on. If any two consecucharges have opposite sign but the first charnecessarily positive, what will be the potental ae of em, 2(1) Infinity(2) Zero1 1244πε 0(4)
Answer» Electric charges having same magnitude ofcharge 'q' coulombs are placed at x 14 m, 8so on. If any two consecucharges have opposite sign but the first charnecessarily positive, what will be the potental ae of em, 2(1) Infinity(2) Zero1 1244πε 0(4)

Discussion

7608.	In the figure shown below, the charge on the left plate of the 10 μF capacitor is −30 μC. The charge on the right place of the 6 μF capacitor is:
Answer» In the figure shown below, the charge on the left plate of the $10 μ F$ capacitor is $- 30 μ C$ . The charge on the right place of the $6 μ F$ capacitor is:

Discussion

7609.	The half−value period of a synthetic molecule is given to be 26.8 minutes. The mass of One curie of this molecule is (1 curie =3.71×1010dps and molecular mass of molecule =214 g)
Answer» The half−value period of a synthetic molecule is given to be 26.8 minutes. The mass of One curie of this molecule is (1 curie $= 3.71 \times 10^{10} d p s$ and molecular mass of molecule $= 214 g$ )

Discussion

7610.	125 power x-1=5power3x-2-500 find x
Answer» 125 power x-1=5power3x-2-500 find x

Discussion

7611.	A particle moves along x-axis such that its velocity (v) varies with time (t) as v = (4t – t2) m/s. The distance travelled by the particle from t = 0 to t = 6 s is
Answer» A particle moves along x-axis such that its velocity (v) varies with time (t) as v = (4t – t2) m/s. The distance travelled by the particle from t = 0 to t = 6 s is

Discussion

7612.	An ammeter and a milliammeter are converted from the same type of galvanometer .Out of the two which will have higher resistance?
Answer» An ammeter and a milliammeter are converted from the same type of galvanometer .Out of the two which will have higher resistance?

Discussion

7613.	In Rutherford's experiment, number of α-particles, which were scattered or deflected is proportional to
Answer» In Rutherford's experiment, number of α-particles, which were scattered or deflected is proportional to

Discussion

7614.	In the figure shown, block A is displaced by 0.75 m to the right and block B is displaced by 0.25 m to left. Find the reading of the spring balance. Take g=10 m/s2
Answer» In the figure shown, block $A$ is displaced by $0.75 m$ to the right and block $B$ is displaced by $0.25 m$ to left. Find the reading of the spring balance. Take $g = 10 m / s^{2}$

Discussion

7615.	PSLV launches a rocket in a gravity free space with constant acceleration 5 m/s2 along +x direction (see figure). The length of the chamber inside the rocket is 6 m. At time t=0, a ball is thrown from the left end of the chamber in +x direction with a speed 0.7 m/s relative to the rocket. At the same time, another ball is thrown in opposite direction to the previous ball with a speed 0.3 m/s relative to the rocket. The time in seconds when the two balls hit each other is
Answer» PSLV launches a rocket in a gravity free space with constant acceleration $5 {m/s}^{2}$ along +x direction (see figure). The length of the chamber inside the rocket is $6 m$ . At time $t = 0$ , a ball is thrown from the left end of the chamber in +x direction with a speed $0.7 m/s$ relative to the rocket. At the same time, another ball is thrown in opposite direction to the previous ball with a speed $0.3 m/s$ relative to the rocket. The time in seconds when the two balls hit each other is

Discussion

7616.	A tank is filled with water upto a height H. Water is allowed to come out of a hole P in one of the walls at a depth h below the surface of water (see figure). Express the horizontal distance X in terms of H and h.
Answer» A tank is filled with water upto a height $H$ . Water is allowed to come out of a hole $P$ in one of the walls at a depth $h$ below the surface of water (see figure). Express the horizontal distance $X$ in terms of $H$ and $h$ .

Discussion

7617.	The cylindrical tube of a spray pump has a cross-section 5 cm2, one end of which has 50 fine holes, each of area 10−8 m2. If the liquid flows inside the tube with a speed of 0.3 m/min, then find the speed with which the liquid is ejected through the holes.
Answer» The cylindrical tube of a spray pump has a cross-section $5 {cm}^{2}$ , one end of which has $50$ fine holes, each of area $10^{- 8} m^{2}$ . If the liquid flows inside the tube with a speed of $0.3 m/min$ , then find the speed with which the liquid is ejected through the holes.

Discussion

7618.	A faulty barometer contains certain amount of air and saturated water vapour. It reads 74.0 cm when the atmospheric pressure is 76.0 cm of mercury and reads 72.10 cm when the atmospheric pressure is 74.0 cm of mercury. Saturation vapour pressure at the air temperature = 1.0 cm of mercury. Find the length of the barometer tube above the mercury level in the reservoir.
Answer» A faulty barometer contains certain amount of air and saturated water vapour. It reads 74.0 cm when the atmospheric pressure is 76.0 cm of mercury and reads 72.10 cm when the atmospheric pressure is 74.0 cm of mercury. Saturation vapour pressure at the air temperature = 1.0 cm of mercury. Find the length of the barometer tube above the mercury level in the reservoir.

Discussion

7619.	This one will need you to work the calculator a little bit. Given that an x-ray tube operates at 20Kv, what is the maximum speed of the electrons striking the anode? Take 1eV=1.6×1019 J and me=9×10−31kg
Answer» This one will need you to work the calculator a little bit. Given that an x-ray tube operates at 20Kv, what is the maximum speed of the electrons striking the anode? Take $1 e V = 1.6 \times 10^{19}$ J and $m_{e} = 9 \times 10^{- 31}$ kg

Discussion

7620.	A vertical U-tube of uniform cross-section contains water in both the arms. A 12 cm glycerine column (Relative density =1.2) is added to one of the limbs. The level difference between the two surfaces of both the limbs will be
Answer» A vertical U-tube of uniform cross-section contains water in both the arms. A $12 cm$ glycerine column (Relative density $= 1.2$ ) is added to one of the limbs. The level difference between the two surfaces of both the limbs will be

Discussion

7621.	33.Two superimposing waves are represented by equation y1= 2 sin 2pi(10t-0.4x) and y2= 4 sin 2pi(20t-0.8x). What is the ratio of maximum intensity to minimum intensity?
Answer» 33.Two superimposing waves are represented by equation y1= 2 sin 2pi(10t-0.4x) and y2= 4 sin 2pi(20t-0.8x). What is the ratio of maximum intensity to minimum intensity?

Discussion

7622.	What is the bulk modulus of water if an increase of pressure is 100atms changes the volume of 100litres of water by 0.5 litres ?
Answer» What is the bulk modulus of water if an increase of pressure is 100atms changes the volume of 100litres of water by 0.5 litres ?

Discussion

7623.	Two particles P and Q initially separated by 400 m, are moving towards each other along a straight line as shown in figure with ap=2 m/s2, up=15 m/s and aQ=4 m/s2, uQ=25 m/s. Calculate the time when they meet.
Answer» Two particles $P$ and $Q$ initially separated by $400 m$ , are moving towards each other along a straight line as shown in figure with $a_{p} = 2 {m/s}^{2}, u_{p} = 15 m/s$ and $a_{Q} = 4$ ${m/s}^{2}, u_{Q} = 25 m/s$ . Calculate the time when they meet.

Discussion

7624.	An alternating voltage v(t) = 220 sin 100wt voltis applied to a purely resistive load of 50 ohm. Thetime taken for the current to rise from half ofthe peak value to the peak value is(1) 2.2 ms (2) 7.2 ms(3) 5 ms (4) 3.3 ms
Answer» An alternating voltage v(t) = 220 sin 100wt volt is applied to a purely resistive load of 50 ohm. The time taken for the current to rise from half of the peak value to the peak value is (1) 2.2 ms (2) 7.2 ms (3) 5 ms (4) 3.3 ms

Discussion

7625.	Equal currents are flowing in four infinitely long wires. Distance between any two adjacent wires is same, then Column I Column II1) force on wire 1p) inwards2) force on wire 2q) leftwards3) force on wire 3r) rightwards4) force on wire 4s) zero
Answer» Equal currents are flowing in four infinitely long wires. Distance between any two adjacent wires is same, then $\begin{matrix} Column I & Column II 1) force on wire 1 & p) inwards 2) force on wire 2 & q) leftwards 3) force on wire 3 & r) rightwards 4) force on wire 4 & s) zero \end{matrix}$

Discussion

7626.	We wish to obtain a capacitance of 5 μF, by using some capacitors, each of 2 μF. Then, the minimum number of capacitors required is
Answer» We wish to obtain a capacitance of $5 μ F$ , by using some capacitors, each of $2 μ F$ . Then, the minimum number of capacitors required is

Discussion

7627.	Athin circular loop of radius Rrotatesabout its vertical diameter with an angular frequency ω.Show thata small bead on the wire loop remains at its lowermost point for.What isthe angle made by the radius vector joining the centre to the beadwith the vertical downward direction for ?Neglectfriction.
Answer» A thin circular loop of radius R rotates about its vertical diameter with an angular frequency ω. Show that a small bead on the wire loop remains at its lowermost point for.What is the angle made by the radius vector joining the centre to the bead with the vertical downward direction for ?Neglect friction.

Discussion

7628.	The frequency of radiation emitted when the electron falls from n=4 to n=1 in hydrogen atom will be. If ionisation energy of H=2.1810 to the power -18J atom-1
Answer» The frequency of radiation emitted when the electron falls from n=4 to n=1 in hydrogen atom will be. If ionisation energy of H=2.1810 to the power -18J atom-1

Discussion

7629.	Find the height of the center of mass of the equilateral triangular lamina from the side AB as shown in figure. Given, side of the triangular lamina is 3 m.
Answer» Find the height of the center of mass of the equilateral triangular lamina from the side $AB$ as shown in figure. Given, side of the triangular lamina is $3 m$ .

Discussion

7630.	273 cm cube of an ideal gas is at 0 degree Celsius. It is heated at constant pressure to 100 degree Celsius. It will now occupy how much volume
Answer» 273 cm cube of an ideal gas is at 0 degree Celsius. It is heated at constant pressure to 100 degree Celsius. It will now occupy how much volume

Discussion

7631.	Two balls are projected at an angle θ and (90∘−θ) to the horizontal with the same speed. The ratio of their maximum vertical heights is
Answer» Two balls are projected at an angle $θ$ and $(90^{\circ} - θ)$ to the horizontal with the same speed. The ratio of their maximum vertical heights is

Discussion

7632.	A sphere of solid material of specific gravity 8 has a concentric spherical cavity and just sinks in water. The ratio of radius of cavity to that of outer radius of the sphere must be
Answer» A sphere of solid material of specific gravity $8$ has a concentric spherical cavity and just sinks in water. The ratio of radius of cavity to that of outer radius of the sphere must be

Discussion

7633.	Burst the bubbles if 1 is carried to tens place when adding numbers inside them.
Answer» Burst the bubbles if $1$ is carried to tens place when adding numbers inside them.

Discussion

7634.	A rocket of mass M is launched vertically from the surface of the earth with an initial speed V. Assuming the radius of the earth to be R and negligible air resistance, the maximum height attained by the rocket above the surface of the earth is
Answer» A rocket of mass M is launched vertically from the surface of the earth with an initial speed V. Assuming the radius of the earth to be R and negligible air resistance, the maximum height attained by the rocket above the surface of the earth is

Discussion

7635.	Two particles A and B of mass 1 kg and 4 kg respectively approach each other due to their mutual gravitational force only.Then the ratio of acceleration of A to B at any ins†an t i
Answer» Two particles A and B of mass 1 kg and 4 kg respectively approach each other due to their mutual gravitational force only.Then the ratio of acceleration of A to B at any ins†an t i

Discussion

7636.	An air filled parallel plate capacitor of capacitance50 uF is connected to a battery of 100 V. A slab ofdielectric constant 4 is inserted in it to fill the spacecompletely. Find the extra charge flown through thebattery till it attains the steady state
Answer» An air filled parallel plate capacitor of capacitance50 uF is connected to a battery of 100 V. A slab ofdielectric constant 4 is inserted in it to fill the spacecompletely. Find the extra charge flown through thebattery till it attains the steady state

Discussion

7637.	40. Two parallel rectangular superconducting plates of length l width b and separation a (l>>b>>a) are joined at each end to form a one turn coil of negligible resistance. what is the self inductance ?? how much energy is stored in the magnetic field when a Steady Current I flows? The Separation increases by a small amount (del a). calculate the various energy changes (A) when a coil includes in its circuit a lossless which maintains a constant current I (B) when a circuit consists of coil alone Deduce the magnitude and direction of force per unit area between the two plates
Answer» 40. Two parallel rectangular superconducting plates of length l width b and separation a (l>>b>>a) are joined at each end to form a one turn coil of negligible resistance. what is the self inductance ?? how much energy is stored in the magnetic field when a Steady Current I flows? The Separation increases by a small amount (del a). calculate the various energy changes (A) when a coil includes in its circuit a lossless which maintains a constant current I (B) when a circuit consists of coil alone Deduce the magnitude and direction of force per unit area between the two plates

Discussion

7638.	To get an output Y=1 from the circuit shown, the input A,B and C must be respectively.
Answer» To get an output $Y = 1$ from the circuit shown, the input $A, B$ and $C$ must be respectively.

Discussion

7639.	Let →p=2^i+3^j+^k and →q=^i+2^j+^k be two vectors. If a vector →r=α^i+β^j+γ^k is perpendicular to each of the vectors (→p+→q) and (→p−→q), and ∣∣→r∣∣=√3, then \|α\|+\|β\|+\|γ\| is equal to
Answer» Let $\to p = 2^i + 3^j +^k$ and $\to q =^i + 2^j +^k$ be two vectors. If a vector $\to r = α^i + β^j + γ^k$ is perpendicular to each of the vectors $(\to p + \to q)$ and $(\to p - \to q),$ and $∣ ∣ \to r ∣ ∣ = \sqrt{3},$ then $\| α \| + \| β \| + \| γ \|$ is equal to

Discussion

7640.	A particle is subjected to two simple harmonic motions, one along the X-axis and the other on a line making an angle 45∘ with the X-axis. The two motions are given by x=x0 sin ωt and s=s0 sin ωt Find the amplitude of the resultant motion.
Answer» A particle is subjected to two simple harmonic motions, one along the X-axis and the other on a line making an angle $45^{\circ}$ with the X-axis. The two motions are given by $x = x_{0} s i n ω t$ and $s = s_{0} s i n ω t$ Find the amplitude of the resultant motion.

7640.

A particle is subjected to two simple harmonic motions, one along the X-axis and the other on a line making an angle 45∘ with the X-axis. The two motions are given by x=x0 sin ωt and s=s0 sin ωt Find the amplitude of the resultant motion.

Answer»

A particle is subjected to two simple harmonic motions, one along the X-axis and the other on a line making an angle

$45^{\circ}$ with the X-axis. The two motions are given by $x = x_{0} s i n ω t$ and $s = s_{0} s i n ω t$

Find the amplitude of the resultant motion.

Discussion

7641.	An 8m long copper wire and a 4m long steel wire, each of cross-section 0.5 cm2 are fastened end to end and stretched by a 500 N force. The elastic potential energy of the system is (YCopper=1×1011Nm−2;Ysteel=2×1011Nm−2)
Answer» An 8m long copper wire and a 4m long steel wire, each of cross-section 0.5 cm² are fastened end to end and stretched by a 500 N force. The elastic potential energy of the system is $(Y_{C o p p e r} = 1 \times 10^{11} N m^{- 2}; Y_{s t e e l} = 2 \times 10^{11} N m^{- 2})$

Discussion

7642.	37. In two vessels of 1 litre each at the same temperature 1 g of H2 and 1 g of CH4 are taken for these: (1) Vrms Values will be same. (2) Kinetic energy per mol will be same. (3) Total kinetic energy will same (4) Pressure will be same
Answer» 37. In two vessels of 1 litre each at the same temperature 1 g of H2 and 1 g of CH4 are taken for these: (1) Vrms Values will be same. (2) Kinetic energy per mol will be same. (3) Total kinetic energy will same (4) Pressure will be same

Discussion

7643.	A body of mass 2 kg is travelling with uniform velocity from (1,2,4)m to (3,4,6)m in 4 seconds. The kinetic energy of the body is
Answer» A body of mass $2 kg$ is travelling with uniform velocity from $(1, 2, 4) m$ to $(3, 4, 6) m$ in $4 seconds$ . The kinetic energy of the body is

Discussion

7644.	a circular loop of flexible conducting material is kept in magnetic field direcyed parpaendicularily into its plane by holding the loop at diameterically opposite points its is suddenly stretched outwards the
Answer» a circular loop of flexible conducting material is kept in magnetic field direcyed parpaendicularily into its plane by holding the loop at diameterically opposite points its is suddenly stretched outwards the

Discussion

7645.	Two particles A and B are projected from a point O on a horizontal plane, with velocities 20m/s and 20√2 m/s respectively at angles 30∘ and 45∘ with the horizontal respectively in the same plane. If the maximum separation is x×10√12+(√3−2)2. Find x. Assume that the two particles get stuck to the ground when they fall over it.___
Answer» Two particles A and B are projected from a point O on a horizontal plane, with velocities 20m/s and $20 \sqrt{2 m / s}$ respectively at angles $30^{\circ}$ and $45^{\circ}$ with the horizontal respectively in the same plane. If the maximum separation is $x \times 10 \sqrt{1^{2} + (\sqrt{3} - 2)^{2}}$ . Find x. Assume that the two particles get stuck to the ground when they fall over it.___

Discussion

7646.	A thin dielectric rod of length l lies along the x-axis with one end at the origin and the other end at the point (l,0). It is charged uniformly along its length with a total charge Q. The potential at a point (x,0) when x>l is:
Answer» A thin dielectric rod of length $l$ lies along the $x-axis$ with one end at the origin and the other end at the point $(l, 0)$ . It is charged uniformly along its length with a total charge $Q$ . The potential at a point $(x, 0)$ when $x > l$ is:

Discussion

7647.	The displacement of a particle executing periodic motion is given by y=4cos2(t2)sin(1000t). The number of independent constituent simple harmonic motion is
Answer» The displacement of a particle executing periodic motion is given by $y = 4 {cos}^{2} (\frac{t}{2}) sin (1000 t)$ . The number of independent constituent simple harmonic motion is

Discussion

7648.	A cell of e.m.f. 1.8 V and internal resistance 2Ω is connected in series with an ammeter of resistance 0.7Ω and a resistor of 4.5Ω as shown in the figure. (a) What would be the reading of the ammeter? (b) What is the potential difference across the terminals of the cell?
Answer» A cell of e.m.f. 1.8 V and internal resistance $2 Ω$ is connected in series with an ammeter of resistance $0.7 Ω$ and a resistor of $4.5 Ω$ as shown in the figure. (a) What would be the reading of the ammeter? (b) What is the potential difference across the terminals of the cell?

Discussion

7649.	A constant force 10 N acts on a ball of mass 2 kg for 2 s . Then another force 18 N acts on the same ball for 109 second. If ball is initially at rest, then find the total work done.
Answer» A constant force $10 N$ acts on a ball of mass $2 kg$ for $2 s$ . Then another force $18 N$ acts on the same ball for $\frac{10}{9} second$ . If ball is initially at rest, then find the total work done.

Discussion

7650.	Find the second derivative of the following function: y=e3x+2
Answer» Find the second derivative of the following function: $y = e^{3 x + 2}$

Discussion

Explore topic-wise InterviewSolutions in .

An object is placed at a distance of 40 cm in front of a concave mirror of focal length 15 cm. Where a screen should be placed in order to obtain a sharp image?

19.Three waves Y1 = asin(wt-kx), Y2 = Asin(wt-kx+h) and Y3 = Asin(wt-kx+2h) are superimposed so that Y1+Y2+Y3 = 0 at all positions. Then the value of h is

Two bodies P and Q have thermal emissivities of ϵP and ϵQ respectively. Surface areas of these bodies are same and the total radiant power is also emitted at the same rate. If temperature of P is θP kelvin then temperature of Q i.e. θQ is equal to

The potential energy of a 4 kg particle free to move along the x− axis is given by U(x)=x33−5x22+6x+3Total mechanical energy of the particle is 17 J. Then the maximum kinetic energy in joules is

An electron moving with speed v and a photon, moving with speed c, have the same de-Broglie wavelength. The ratio of kinetic energy of electron to that of photon is :

Four identical hollow cylindrical columns of mild steel support a big structure of mass 50×103 kg. The inner and outer radii of each column are 50 cm and 100 cm respectively. Assuming uniform local distribution, calculate the compression strain of each column.[use Y=2.0×1011 Pa,g=9.8 m/s2]

Electric charges having same magnitude ofcharge 'q' coulombs are placed at x 14 m, 8so on. If any two consecucharges have opposite sign but the first charnecessarily positive, what will be the potental ae of em, 2(1) Infinity(2) Zero1 1244πε 0(4)

In the figure shown below, the charge on the left plate of the 10 μF capacitor is −30 μC. The charge on the right place of the 6 μF capacitor is:

The half−value period of a synthetic molecule is given to be 26.8 minutes. The mass of One curie of this molecule is (1 curie =3.71×1010dps and molecular mass of molecule =214 g)

125 power x-1=5power3x-2-500 find x

A particle moves along x-axis such that its velocity (v) varies with time (t) as v = (4t – t2) m/s. The distance travelled by the particle from t = 0 to t = 6 s is

An ammeter and a milliammeter are converted from the same type of galvanometer .Out of the two which will have higher resistance?

In Rutherford's experiment, number of α-particles, which were scattered or deflected is proportional to

In the figure shown, block A is displaced by 0.75 m to the right and block B is displaced by 0.25 m to left. Find the reading of the spring balance. Take g=10 m/s2

A tank is filled with water upto a height H. Water is allowed to come out of a hole P in one of the walls at a depth h below the surface of water (see figure). Express the horizontal distance X in terms of H and h.

The cylindrical tube of a spray pump has a cross-section 5 cm2, one end of which has 50 fine holes, each of area 10−8 m2. If the liquid flows inside the tube with a speed of 0.3 m/min, then find the speed with which the liquid is ejected through the holes.

This one will need you to work the calculator a little bit. Given that an x-ray tube operates at 20Kv, what is the maximum speed of the electrons striking the anode? Take 1eV=1.6×1019 J and me=9×10−31kg

A vertical U-tube of uniform cross-section contains water in both the arms. A 12 cm glycerine column (Relative density =1.2) is added to one of the limbs. The level difference between the two surfaces of both the limbs will be

33.Two superimposing waves are represented by equation y1= 2 sin 2pi(10t-0.4x) and y2= 4 sin 2pi(20t-0.8x). What is the ratio of maximum intensity to minimum intensity?

What is the bulk modulus of water if an increase of pressure is 100atms changes the volume of 100litres of water by 0.5 litres ?

Two particles P and Q initially separated by 400 m, are moving towards each other along a straight line as shown in figure with ap=2 m/s2, up=15 m/s and aQ=4 m/s2, uQ=25 m/s. Calculate the time when they meet.

An alternating voltage v(t) = 220 sin 100wt voltis applied to a purely resistive load of 50 ohm. Thetime taken for the current to rise from half ofthe peak value to the peak value is(1) 2.2 ms (2) 7.2 ms(3) 5 ms (4) 3.3 ms

Equal currents are flowing in four infinitely long wires. Distance between any two adjacent wires is same, then Column I Column II1) force on wire 1p) inwards2) force on wire 2q) leftwards3) force on wire 3r) rightwards4) force on wire 4s) zero

We wish to obtain a capacitance of 5 μF, by using some capacitors, each of 2 μF. Then, the minimum number of capacitors required is

The frequency of radiation emitted when the electron falls from n=4 to n=1 in hydrogen atom will be. If ionisation energy of H=2.1810 to the power -18J atom-1

Find the height of the center of mass of the equilateral triangular lamina from the side AB as shown in figure. Given, side of the triangular lamina is 3 m.

273 cm cube of an ideal gas is at 0 degree Celsius. It is heated at constant pressure to 100 degree Celsius. It will now occupy how much volume

Two balls are projected at an angle θ and (90∘−θ) to the horizontal with the same speed. The ratio of their maximum vertical heights is

A sphere of solid material of specific gravity 8 has a concentric spherical cavity and just sinks in water. The ratio of radius of cavity to that of outer radius of the sphere must be

Burst the bubbles if 1 is carried to tens place when adding numbers inside them.

A rocket of mass M is launched vertically from the surface of the earth with an initial speed V. Assuming the radius of the earth to be R and negligible air resistance, the maximum height attained by the rocket above the surface of the earth is

Two particles A and B of mass 1 kg and 4 kg respectively approach each other due to their mutual gravitational force only.Then the ratio of acceleration of A to B at any ins†an t i

An air filled parallel plate capacitor of capacitance50 uF is connected to a battery of 100 V. A slab ofdielectric constant 4 is inserted in it to fill the spacecompletely. Find the extra charge flown through thebattery till it attains the steady state

To get an output Y=1 from the circuit shown, the input A,B and C must be respectively.

Let →p=2^i+3^j+^k and →q=^i+2^j+^k be two vectors. If a vector →r=α^i+β^j+γ^k is perpendicular to each of the vectors (→p+→q) and (→p−→q), and ∣∣→r∣∣=√3, then |α|+|β|+|γ| is equal to

A particle is subjected to two simple harmonic motions, one along the X-axis and the other on a line making an angle 45∘ with the X-axis. The two motions are given by x=x0 sin ωt and s=s0 sin ωt Find the amplitude of the resultant motion.

An 8m long copper wire and a 4m long steel wire, each of cross-section 0.5 cm2 are fastened end to end and stretched by a 500 N force. The elastic potential energy of the system is (YCopper=1×1011Nm−2;Ysteel=2×1011Nm−2)

37. In two vessels of 1 litre each at the same temperature 1 g of H2 and 1 g of CH4 are taken for these: (1) Vrms Values will be same. (2) Kinetic energy per mol will be same. (3) Total kinetic energy will same (4) Pressure will be same

A body of mass 2 kg is travelling with uniform velocity from (1,2,4)m to (3,4,6)m in 4 seconds. The kinetic energy of the body is

a circular loop of flexible conducting material is kept in magnetic field direcyed parpaendicularily into its plane by holding the loop at diameterically opposite points its is suddenly stretched outwards the

A thin dielectric rod of length l lies along the x-axis with one end at the origin and the other end at the point (l,0). It is charged uniformly along its length with a total charge Q. The potential at a point (x,0) when x&gt;l is:

The displacement of a particle executing periodic motion is given by y=4cos2(t2)sin(1000t). The number of independent constituent simple harmonic motion is

A cell of e.m.f. 1.8 V and internal resistance 2Ω is connected in series with an ammeter of resistance 0.7Ω and a resistor of 4.5Ω as shown in the figure. (a) What would be the reading of the ammeter? (b) What is the potential difference across the terminals of the cell?

A constant force 10 N acts on a ball of mass 2 kg for 2 s . Then another force 18 N acts on the same ball for 109 second. If ball is initially at rest, then find the total work done.

Find the second derivative of the following function: y=e3x+2

A thin dielectric rod of length l lies along the x-axis with one end at the origin and the other end at the point (l,0). It is charged uniformly along its length with a total charge Q. The potential at a point (x,0) when x>l is: