50278 + Interview Questions in Physics Page 117 InterviewSolution

5801.	Three identical bodies of equal mass m each are moving along a circle of radius r under the action of their mutual gravitational attraction. the speed of each body is :-Three identical bodies of equal mass m each are moving along a circle of radius r under the action of their mutual gravitational attraction. the speed of each body is :
Answer» Three identical bodies of equal mass m each are moving along a circle of radius r under the action of their mutual gravitational attraction. the speed of each body is :-Three identical bodies of equal mass m each are moving along a circle of radius r under the action of their mutual gravitational attraction. the speed of each body is :

Discussion

5802.	What is the magnitude of minimum force F necessary to push the block up against a wall, as shown in the figure. The coefficient of friction between the block and the wall is 0.5, the weight of the block is 12 N.
Answer» What is the magnitude of minimum force $F$ necessary to push the block up against a wall, as shown in the figure. The coefficient of friction between the block and the wall is $0.5$ , the weight of the block is $12 N$ .

Discussion

5803.	The equation of thermodynamic state of an ideal gas can be expressed as (P+aV2)(V−b)=RT. Here, P is the pressure, V is the volume, T is the absolute temperature and a,b, and R are constants. Which of the following options correctly represents the dimension of a?
Answer» The equation of thermodynamic state of an ideal gas can be expressed as $(P + \frac{a}{V^{2}}) (V - b) = R T$ . Here, $P$ is the pressure, $V$ is the volume, $T$ is the absolute temperature and $a, b,$ and $R$ are constants. Which of the following options correctly represents the dimension of $a$ ?

Discussion

5804.	the increase in pressure required to decrese the 200L volume of a liquidby 0.008% in kpa i
Answer» the increase in pressure required to decrese the 200L volume of a liquidby 0.008% in kpa i

Discussion

5805.	56.a parralel plate capacitor ,capacitance C is charged with a battery of v volts.a dielectric slab of di electric constant K is placed between the plates to fully occupy space .the battery remains connected.what will be new electrosatic force of attraction between the plates if initial force was F .also find the new electric feild ,potential difference ,and electric potential energy(if initials are
Answer» 56.a parralel plate capacitor ,capacitance C is charged with a battery of v volts.a dielectric slab of di electric constant K is placed between the plates to fully occupy space .the battery remains connected.what will be new electrosatic force of attraction between the plates if initial force was F .also find the new electric feild ,potential difference ,and electric potential energy(if initials are

Discussion

5806.	Find the effective resistance between A and B in the given figure
Answer» Find the effective resistance between A and B in the given figure

Discussion

5807.	Consider the circuit shown in the figure below:The output curve of Vout versus Iin can be represented as
Answer» Consider the circuit shown in the figure below: The output curve of $V_{o u t}$ versus $I_{i n}$ can be represented as

Discussion

5808.	Intensity of magnetic field at point x on the axis of a small magnet is equal to the field intensity at another. Point on its equatorial axis .The ratio of X and Y from the centre of the magnet will be?
Answer» Intensity of magnetic field at point x on the axis of a small magnet is equal to the field intensity at another. Point on its equatorial axis .The ratio of X and Y from the centre of the magnet will be?

Discussion

5809.	In the following common emitter configuration, an NPN transistor with current gain b=100 is used. The output voltage of the amplifier will be
Answer» In the following common emitter configuration, an $N P N$ transistor with current gain $b = 100$ is used. The output voltage of the amplifier will be

Discussion

5810.	In a p-n junction diode, the current I can be expressed aswhere I0is called the reverse saturation current, V is the voltageacross the diode and is positive for forward bias and negative forreverse bias, and I is the current through the diode, kBis the Boltzmann constant (8.6×10−5 eV/K)and T is the absolute temperature. If for a given diode I0= 5 × 10−12 A and T = 300 K, then(a) What willbe the forward current at a forward voltage of 0.6 V?(b) What will be the increase in the current if the voltageacross the diode is increased to 0.7 V?(c) What is thedynamic resistance?(d) What willbe the current if reverse bias voltage changes from 1 V to 2 V?
Answer» In a p-n junction diode, the current I can be expressed as where I₀ is called the reverse saturation current, V is the voltage across the diode and is positive for forward bias and negative for reverse bias, and I is the current through the diode, k_Bis the Boltzmann constant (8.6×10⁻⁵ eV/K) and T is the absolute temperature. If for a given diode I₀ = 5 × 10⁻¹²A and T = 300 K, then (a) What will be the forward current at a forward voltage of 0.6 V? (b) What will be the increase in the current if the voltage across the diode is increased to 0.7 V? (c) What is the dynamic resistance? (d) What will be the current if reverse bias voltage changes from 1 V to 2 V?

5810.

In a p-n junction diode, the current I can be expressed aswhere I0is called the reverse saturation current, V is the voltageacross the diode and is positive for forward bias and negative forreverse bias, and I is the current through the diode, kBis the Boltzmann constant (8.6×10−5 eV/K)and T is the absolute temperature. If for a given diode I0= 5 × 10−12 A and T = 300 K, then(a) What willbe the forward current at a forward voltage of 0.6 V?(b) What will be the increase in the current if the voltageacross the diode is increased to 0.7 V?(c) What is thedynamic resistance?(d) What willbe the current if reverse bias voltage changes from 1 V to 2 V?

Answer»

In a p-n junction diode, the current I can be expressed as

where I₀
is called the reverse saturation current, V is the voltage
across the diode and is positive for forward bias and negative for
reverse bias, and I is the current through the diode, k_Bis the Boltzmann constant (8.6×10⁻⁵ eV/K)
and T is the absolute temperature. If for a given diode I₀
= 5 × 10⁻¹²A and T = 300 K, then

(a) What will
be the forward current at a forward voltage of 0.6 V?

(b) What will be the increase in the current if the voltage
across the diode is increased to 0.7 V?

(c) What is the
dynamic resistance?

(d) What will
be the current if reverse bias voltage changes from 1 V to 2 V?

Discussion

5811.	Two resistors have resistances R01 and R02 at 0∘C and temperature coefficients ∝1 and ∝2. Find the value of ∝ for their parallel combination.
Answer» Two resistors have resistances $R_{01}$ and $R_{02}$ at $0^{\circ} C$ and temperature coefficients $\propto_{1}$ and $\propto_{2}$ . Find the value of $\propto$ for their parallel combination.

Discussion

5812.	I have multiple dielectrics (of surface area in contact with capacitor as A1,A2andA3) in my capacitor inserted as shown. What is my new capacitance?
Answer» I have multiple dielectrics (of surface area in contact with capacitor as $A_{1}, A_{2} a n d A_{3})$ in my capacitor inserted as shown. What is my new capacitance?

Discussion

5813.	The centre of mass of a uniform rod of length 10 m is moving with translational velocity of 50 m/s on a frictionless horizontal surface as shown in the figure and the rod rotates about its centre of mass with an angular velocity of 5 rad/sec. Find out the velocities of points A and B.
Answer» The centre of mass of a uniform rod of length $10 m$ is moving with translational velocity of $50 m/s$ on a frictionless horizontal surface as shown in the figure and the rod rotates about its centre of mass with an angular velocity of $5 rad/sec$ . Find out the velocities of points $A$ and $B$ .

Discussion

5814.	During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The γ of the gas is
Answer» During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The $γ$ of the gas is

Discussion

5815.	Two identical blocks a and b each of mass are placed on smooth horizontal plane . At t=0 block b is given a velocity of 5m/s . Calculate the compression in the spring when velocity of A is 3m/s given spring constant of ideal spring is k
Answer» Two identical blocks a and b each of mass are placed on smooth horizontal plane . At t=0 block b is given a velocity of 5m/s . Calculate the compression in the spring when velocity of A is 3m/s given spring constant of ideal spring is k

Discussion

5816.	a tuning fork is used to produce resonance in a glass tube.The length of the air column in this tube can be adjusted by a variable piston.At room temperatureof 27^° C two successive resonances are produced at 20cm and 73cm of column length.If the frequency of the tuning fork is 320hertz,the velocity of sound in air at 27^° c is
Answer» a tuning fork is used to produce resonance in a glass tube.The length of the air column in this tube can be adjusted by a variable piston.At room temperatureof 27^° C two successive resonances are produced at 20cm and 73cm of column length.If the frequency of the tuning fork is 320hertz,the velocity of sound in air at 27^° c is

Discussion

5817.	The separation L between the objective (f=0.5 cm) and the eyepiece (f=5 cm) of a compound microscope is 7 cm. Where should a small object be placed so that the eye is least strained to see the image?
Answer» The separation $L$ between the objective $(f = 0.5 c m)$ and the eyepiece $(f = 5 c m)$ of a compound microscope is $7 c m$ . Where should a small object be placed so that the eye is least strained to see the image?

Discussion

5818.	A 208 V, 45 kVA, 0.8 pf leading, Δ− connected, 60 Hz synchronous machine has a synchronous reactance of 2.5Ω and a negligible armature resistance. Its friction and windage losses are 1.5 kW and its core losses are 1.0 kW. The shaft is supplying a 15-hp load and the motor's pf is 0.80 leading. The value of induced voltage is______ (1 hp = 746 W)
Answer» A 208 V, 45 kVA, 0.8 pf leading, $Δ -$ connected, 60 Hz synchronous machine has a synchronous reactance of $2.5 Ω$ and a negligible armature resistance. Its friction and windage losses are 1.5 kW and its core losses are 1.0 kW. The shaft is supplying a 15-hp load and the motor's pf is 0.80 leading. The value of induced voltage is______ (1 hp = 746 W)

Discussion

5819.	There were 4 objects A,B,C,D. A scientist claimed that they have charges 4×10−17 C, 4×10−19 C, 4×10−15 C and 4×10−14 C respectively. Which of the following of his claims is false?
Answer» There were 4 objects $A, B, C, D$ . A scientist claimed that they have charges $4 \times 10^{- 17} C, 4 \times 10^{- 19} C, 4 \times 10^{- 15} C$ and $4 \times 10^{- 14} C$ respectively. Which of the following of his claims is false?

Discussion

5820.	A lens forms a real image 3 centimetre high of an object 1 cm high .if the separation of object and image is 15 cm find the focal length of the lens?
Answer» A lens forms a real image 3 centimetre high of an object 1 cm high .if the separation of object and image is 15 cm find the focal length of the lens?

Discussion

5821.	51. Explain dpi- ppi bonding in SO2CI2?
Answer» 51. Explain dpi- ppi bonding in SO2CI2?

Discussion

5822.	4.Assuming air to be ideal gas ,find the temperature at which speed of sound in air becomes double of its value at 27 degrees Celsius
Answer» 4.Assuming air to be ideal gas ,find the temperature at which speed of sound in air becomes double of its value at 27 degrees Celsius

Discussion

5823.	Give the electronic configuration of all the elements from atomic no. 1 to 30 Such as hydrogen - 1S1... And so on . Thank you
Answer» Give the electronic configuration of all the elements from atomic no. 1 to 30 Such as hydrogen - 1S1... And so on . Thank you

5823.

Give the electronic configuration of all the elements from atomic no. 1 to 30 Such as hydrogen - 1S1... And so on . Thank you

Answer»

Give the electronic configuration of all the elements from atomic no. 1 to 30

Such as hydrogen - 1S1... And so on .

Thank you

Discussion

5824.	A car moves through 20 km with a speed of 40 km/hr and the next 20 km with a speed of 60 km/hr. Calculate its average speed.
Answer» A car moves through $20 km$ with a speed of $40 km/hr$ and the next $20 km$ with a speed of $60 km/hr$ . Calculate its average speed.

Discussion

5825.	WHAT IS THE DIFFERENCE BETWEEN OHM'S LAW AND COULOMB'S LAW ?
Answer» WHAT IS THE DIFFERENCE BETWEEN OHM'S LAW AND COULOMB'S LAW ?

Discussion

5826.	Cosider a gravity - free hall in which a tray of mass M , carrying a cubical block of ice of mass m and edge L , is at rest in the middle. If the ice melts, by what distance does the centre of mass of "the tray plus the ice" system descent ?
Answer» Cosider a gravity - free hall in which a tray of mass M , carrying a cubical block of ice of mass m and edge L , is at rest in the middle. If the ice melts, by what distance does the centre of mass of "the tray plus the ice" system descent ?

5826.

Cosider a gravity - free hall in which a tray of mass M , carrying a cubical block of ice of mass m and edge L , is at rest in the middle. If the ice melts, by what distance does the centre of mass of "the tray plus the ice" system descent ?

Answer»

Cosider a gravity - free hall in which a tray of mass M , carrying a cubical block of ice of mass m and edge L , is at rest in the middle. If the ice melts, by what distance does the centre of mass of "the tray plus the ice" system descent ?

Discussion

5827.	Light with an average flux of 20 W/cm2 falls on an absorbing surface at normal incidence having surface area 20 cm2. The momentum received by the surface during time span of 1 second is
Answer» Light with an average flux of $20 {W/cm}^{2}$ falls on an absorbing surface at normal incidence having surface area $20 {cm}^{2}$ . The momentum received by the surface during time span of $1$ second is

Discussion

5828.	Obtain the conditions for constructive and destructive
Answer» Obtain the conditions for constructive and destructive

Discussion

5829.	172 Keeping moment of inertia constant the angular momentum of a body is increased by 20%.then the percentage increase in rotational kinetic energy is?
Answer» 172 Keeping moment of inertia constant the angular momentum of a body is increased by 20%.then the percentage increase in rotational kinetic energy is?

Discussion

5830.	Two resistance coils connected in series have resistance of 600 Ω and 300 Ω at 20∘C and temperature co-efficient of resistances are 0.001∘C and 0.004∘C respectively. What is the effective temperature coefficient of the combination?
Answer» Two resistance coils connected in series have resistance of $600 Ω$ and $300 Ω$ at $20^{\circ} C$ and temperature co-efficient of resistances are ${0.001}^{\circ} C$ and ${0.004}^{\circ} C$ respectively. What is the effective temperature coefficient of the combination?

Discussion

5831.	A block of mass 4 kg is kept on a rough horizontal surface. The coefficient of static friction is 0.8. If a force of 19 N is applied on the block parallel to the floor, then the force of friction between the block and the floor is
Answer» A block of mass $4 kg$ is kept on a rough horizontal surface. The coefficient of static friction is $0.8$ . If a force of $19 N$ is applied on the block parallel to the floor, then the force of friction between the block and the floor is

Discussion

5832.	which light spreads more blue or red?
Answer» which light spreads more blue or red?

Discussion

5833.	The potential energy (in SI units) of a particle of mass 2 kg in a conservative field is U=6x−8y. If the initial velocity of the particle is →u=−1.5^i+2^j, then the total distance travelled by the particle in metres in first two seconds
Answer» The potential energy (in SI units) of a particle of mass $2 kg$ in a conservative field is $U = 6 x - 8 y$ . If the initial velocity of the particle is $\to u = - 1.5^i + 2^j$ , then the total distance travelled by the particle in metres in first two seconds

Discussion

5834.	Show that path of projectile is parabola?
Answer» Show that path of projectile is parabola?

Discussion

5835.	A stone dropped from a building of height h and it reaches the ground after t seconds. From the same building if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the ground after t1 and t2 seconds respectively, then
Answer» A stone dropped from a building of height $h$ and it reaches the ground after $t$ seconds. From the same building if two stones are thrown (one upwards and other downwards) with the same velocity $u$ and they reach the ground after $t_{1}$ and $t_{2}$ seconds respectively, then

Discussion

5836.	A glass contains some water at room temperature 20∘C. Refrigerated water is added to it slowly. When the temperature of the glass reaches 10∘C, small droplets condense on the outer surface. Calculate the relative humidity in the room. The boiling point of water at a pressure of 17.5 mm of mercury is 20∘C and at 8.9 mm of mercury it is 10∘C.
Answer» A glass contains some water at room temperature $20^{\circ} C$ . Refrigerated water is added to it slowly. When the temperature of the glass reaches $10^{\circ} C$ , small droplets condense on the outer surface. Calculate the relative humidity in the room. The boiling point of water at a pressure of 17.5 mm of mercury is $20^{\circ} C$ and at 8.9 mm of mercury it is $10^{\circ} C$ .

Discussion

5837.	Suppose a wire is kept vertical, through which current i=5√2sinωt A is flowing. A uniform magnetic field of 4.5 mT exist in horizontal direction. The average magnetic force (in N) on the wire in a complete cycle of current will be (Integer only)
Answer» Suppose a wire is kept vertical, through which current $i = 5 \sqrt{2} sin ω t A$ is flowing. A uniform magnetic field of $4.5 mT$ exist in horizontal direction. The average magnetic force $(in N)$ on the wire in a complete cycle of current will be (Integer only)

Discussion

5838.	A planet is at an average distance d from the sun and its average surface temperature is T. Assume that the planet receives energy only from the sun, and loses energy only through radiation from its surface. Neglect atmospheric effects. If T∝d−n, the value of n
Answer» A planet is at an average distance $d$ from the sun and its average surface temperature is $T$ . Assume that the planet receives energy only from the sun, and loses energy only through radiation from its surface. Neglect atmospheric effects. If $T \propto d^{- n}$ , the value of $n$

Discussion

5839.	76.The power of a sound from the speaker of a radio is 20 milliwatt. By turning the knob of the volume control the power of the sound is increased to 400 milliwatt. The power increase in decibel as compared to the original power is (a)13 dB (b)10 dB (c)20 dB (d)800 dB
Answer» 76.The power of a sound from the speaker of a radio is 20 milliwatt. By turning the knob of the volume control the power of the sound is increased to 400 milliwatt. The power increase in decibel as compared to the original power is (a)13 dB (b)10 dB (c)20 dB (d)800 dB

Discussion

5840.	If an electric heater consumes electricity at the rate of 500 W and the potential difference between the two terminals of the electric circuit is 250 V, calculate the electric current passing through the heater and resistance of it respectively.
Answer» If an electric heater consumes electricity at the rate of $500 W$ and the potential difference between the two terminals of the electric circuit is $250 V$ , calculate the electric current passing through the heater and resistance of it respectively.

Discussion

5841.	∫(sec2x+ex+e3x)dx is equals to
Answer» $\int (s e c^{2} x + e^{x} + e^{3 x}) d x$ is equals to

Discussion

5842.	Why are conservation of mass and conservation of mechanical energy not considered fundamental laws of nature?
Answer» Why are conservation of mass and conservation of mechanical energy not considered fundamental laws of nature?

Discussion

5843.	63. If fV and fR are the focal length of a convex lens for violet and red light respectively and FV and FR are the focal lengths of concave lens for violet and red light respectively then 1) fV fR and FV>FR
Answer» 63. If fV and fR are the focal length of a convex lens for violet and red light respectively and FV and FR are the focal lengths of concave lens for violet and red light respectively then 1) fV fR and FV>FR

Discussion

5844.	A magnet is suspended in the magnetic meridian with an untwisted wire. The upper end of wire is rotated through 181 deg to deflect magnet by 37 deg from magnetic meridian. Now this magnet is replaced by another magnet and upper end of wire has to be rotated by 273deg to deflect magnet by 53deg from magnetic meridian. The ratio magnetic moment of two magnets respectively is ?
Answer» A magnet is suspended in the magnetic meridian with an untwisted wire. The upper end of wire is rotated through 181 deg to deflect magnet by 37 deg from magnetic meridian. Now this magnet is replaced by another magnet and upper end of wire has to be rotated by 273deg to deflect magnet by 53deg from magnetic meridian. The ratio magnetic moment of two magnets respectively is ?

Discussion

5845.	For the figure shown below, the coefficient of friction between 2 kg and 4 kg block is 0.1 and between 4 kg and ground is 0.2. The graph of friction force acting on 4 kg block by the ground as a function of time is
Answer» For the figure shown below, the coefficient of friction between $2 k g$ and $4 k g$ block is $0.1$ and between $4 k g$ and ground is $0.2$ . The graph of friction force acting on $4 k g$ block by the ground as a function of time is

Discussion

5846.	Two particles A and B move with cons†an t velocities v1 and v2 .At the initial moment their position vectors are r1 and r2 respectively.Find the condition for which particles A and B collides\{Re-Aipmt 2015
Answer» Two particles A and B move with cons†an t velocities v1 and v2 .At the initial moment their position vectors are r1 and r2 respectively.Find the condition for which particles A and B collides\{Re-Aipmt 2015

Discussion

5847.	If mass is uniformly distributed, find the distance (in m) of the centre of mass of the T-shaped plate from point O.
Answer» If mass is uniformly distributed, find the distance $(in m)$ of the centre of mass of the T-shaped plate from point $O$ .

Discussion

5848.	If x(t) is represented as given below and h(t)=Sa(9π2t) then the Nyquist rate for output y(t) in Hz will be________ 3
Answer» If $x (t)$ is represented as given below and $h (t) = S a (\frac{9 π}{2} t)$ then the Nyquist rate for output $y (t)$ in $H z$ will be________ 3

Discussion

5849.	Tangential acceleration is rate of change of speed? Then what is rate of change of velocity?
Answer» Tangential acceleration is rate of change of speed? Then what is rate of change of velocity?

Discussion

5850.	A 40 kg child makes 10 revolutions in 29.3 seconds, moving on a circular path. The radius of the path taken by the child is 2.9 meters. Then, centripetal force acting on him is:
Answer» A $40 k g$ child makes $10$ revolutions in $29.3$ seconds, moving on a circular path. The radius of the path taken by the child is $2.9$ meters. Then, centripetal force acting on him is:

Discussion

Explore topic-wise InterviewSolutions in .

What is the magnitude of minimum force F necessary to push the block up against a wall, as shown in the figure. The coefficient of friction between the block and the wall is 0.5, the weight of the block is 12 N.

The equation of thermodynamic state of an ideal gas can be expressed as (P+aV2)(V−b)=RT. Here, P is the pressure, V is the volume, T is the absolute temperature and a,b, and R are constants. Which of the following options correctly represents the dimension of a?

the increase in pressure required to decrese the 200L volume of a liquidby 0.008% in kpa i

Find the effective resistance between A and B in the given figure

Consider the circuit shown in the figure below:The output curve of Vout versus Iin can be represented as

Intensity of magnetic field at point x on the axis of a small magnet is equal to the field intensity at another. Point on its equatorial axis .The ratio of X and Y from the centre of the magnet will be?

In the following common emitter configuration, an NPN transistor with current gain b=100 is used. The output voltage of the amplifier will be

Two resistors have resistances R01 and R02 at 0∘C and temperature coefficients ∝1 and ∝2. Find the value of ∝ for their parallel combination.

I have multiple dielectrics (of surface area in contact with capacitor as A1,A2andA3) in my capacitor inserted as shown. What is my new capacitance?

The centre of mass of a uniform rod of length 10 m is moving with translational velocity of 50 m/s on a frictionless horizontal surface as shown in the figure and the rod rotates about its centre of mass with an angular velocity of 5 rad/sec. Find out the velocities of points A and B.

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The γ of the gas is

Two identical blocks a and b each of mass are placed on smooth horizontal plane . At t=0 block b is given a velocity of 5m/s . Calculate the compression in the spring when velocity of A is 3m/s given spring constant of ideal spring is k

The separation L between the objective (f=0.5 cm) and the eyepiece (f=5 cm) of a compound microscope is 7 cm. Where should a small object be placed so that the eye is least strained to see the image?

There were 4 objects A,B,C,D. A scientist claimed that they have charges 4×10−17 C, 4×10−19 C, 4×10−15 C and 4×10−14 C respectively. Which of the following of his claims is false?

A lens forms a real image 3 centimetre high of an object 1 cm high .if the separation of object and image is 15 cm find the focal length of the lens?

51. Explain dpi- ppi bonding in SO2CI2?

4.Assuming air to be ideal gas ,find the temperature at which speed of sound in air becomes double of its value at 27 degrees Celsius

Give the electronic configuration of all the elements from atomic no. 1 to 30 Such as hydrogen - 1S1... And so on . Thank you

A car moves through 20 km with a speed of 40 km/hr and the next 20 km with a speed of 60 km/hr. Calculate its average speed.

WHAT IS THE DIFFERENCE BETWEEN OHM'S LAW AND COULOMB'S LAW ?

Cosider a gravity - free hall in which a tray of mass M , carrying a cubical block of ice of mass m and edge L , is at rest in the middle. If the ice melts, by what distance does the centre of mass of "the tray plus the ice" system descent ?

Light with an average flux of 20 W/cm2 falls on an absorbing surface at normal incidence having surface area 20 cm2. The momentum received by the surface during time span of 1 second is

Obtain the conditions for constructive and destructive

172 Keeping moment of inertia constant the angular momentum of a body is increased by 20%.then the percentage increase in rotational kinetic energy is?

Two resistance coils connected in series have resistance of 600 Ω and 300 Ω at 20∘C and temperature co-efficient of resistances are 0.001∘C and 0.004∘C respectively. What is the effective temperature coefficient of the combination?

A block of mass 4 kg is kept on a rough horizontal surface. The coefficient of static friction is 0.8. If a force of 19 N is applied on the block parallel to the floor, then the force of friction between the block and the floor is

which light spreads more blue or red?

The potential energy (in SI units) of a particle of mass 2 kg in a conservative field is U=6x−8y. If the initial velocity of the particle is →u=−1.5^i+2^j, then the total distance travelled by the particle in metres in first two seconds

Show that path of projectile is parabola?

A stone dropped from a building of height h and it reaches the ground after t seconds. From the same building if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the ground after t1 and t2 seconds respectively, then

Suppose a wire is kept vertical, through which current i=5√2sinωt A is flowing. A uniform magnetic field of 4.5 mT exist in horizontal direction. The average magnetic force (in N) on the wire in a complete cycle of current will be (Integer only)

A planet is at an average distance d from the sun and its average surface temperature is T. Assume that the planet receives energy only from the sun, and loses energy only through radiation from its surface. Neglect atmospheric effects. If T∝d−n, the value of n

76.The power of a sound from the speaker of a radio is 20 milliwatt. By turning the knob of the volume control the power of the sound is increased to 400 milliwatt. The power increase in decibel as compared to the original power is (a)13 dB (b)10 dB (c)20 dB (d)800 dB

If an electric heater consumes electricity at the rate of 500 W and the potential difference between the two terminals of the electric circuit is 250 V, calculate the electric current passing through the heater and resistance of it respectively.

∫(sec2x+ex+e3x)dx is equals to

Why are conservation of mass and conservation of mechanical energy not considered fundamental laws of nature?

63. If fV and fR are the focal length of a convex lens for violet and red light respectively and FV and FR are the focal lengths of concave lens for violet and red light respectively then 1) fV fR and FV>FR

For the figure shown below, the coefficient of friction between 2 kg and 4 kg block is 0.1 and between 4 kg and ground is 0.2. The graph of friction force acting on 4 kg block by the ground as a function of time is

Two particles A and B move with cons†an t velocities v1 and v2 .At the initial moment their position vectors are r1 and r2 respectively.Find the condition for which particles A and B collides\{Re-Aipmt 2015

If mass is uniformly distributed, find the distance (in m) of the centre of mass of the T-shaped plate from point O.

If x(t) is represented as given below and h(t)=Sa(9π2t) then the Nyquist rate for output y(t) in Hz will be________ 3

Tangential acceleration is rate of change of speed? Then what is rate of change of velocity?

A 40 kg child makes 10 revolutions in 29.3 seconds, moving on a circular path. The radius of the path taken by the child is 2.9 meters. Then, centripetal force acting on him is: