13232 + Interview Questions in Physics Page 44 InterviewSolution

2151.	What actually is differentiation and derivativative?Does derivative give the speed in position-time graph? Suppose f(x) (position/distance) = x^2 where x is time. Then the derivativative of this this function i.e. 2x is it equal to the speed?
Answer» What actually is differentiation and derivativative? Does derivative give the speed in position-time graph? Suppose f(x) (position/distance) = x^2 where x is time. Then the derivativative of this this function i.e. 2x is it equal to the speed?

Discussion

2152.	When a screw gauge of least count 0.01 mm is used to measure the diameter of a wire, the reading on the sleeve is found to be 1 mm and the reading on the thimble is found to be 27 divisions. (i) What is the diameter of the wire in cm ? (ii) If the zero error is + 0.005 cm, what is the correct diameter ?
Answer» When a screw gauge of least count 0.01 mm is used to measure the diameter of a wire, the reading on the sleeve is found to be 1 mm and the reading on the thimble is found to be 27 divisions. (i) What is the diameter of the wire in cm ? (ii) If the zero error is + 0.005 cm, what is the correct diameter ?

Discussion

2153.	Two different bodies are completely immersed in water and undergo the same loss in weight.It is necessary that their weights in air should be the same ? Explain.
Answer» Two different bodies are completely immersed in water and undergo the same loss in weight.It is necessary that their weights in air should be the same ? Explain.

Discussion

2154.	A 1-kg object is lying on the ground. An unbalanced force of magnitude 1 N is applied to the object. Which of these options explains the motion of the object as a result of the acting force?
Answer» A 1-kg object is lying on the ground. An unbalanced force of magnitude 1 N is applied to the object. Which of these options explains the motion of the object as a result of the acting force?

Discussion

2155.	Question 28 (iii)B1, B2 and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. (iii) How much power is dissipated in the circuit when all the three bulbs glow together?
Answer» Question 28 (iii) $B_{1}, B_{2}$ and $B_{3}$ are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. (iii) How much power is dissipated in the circuit when all the three bulbs glow together?

Discussion

2156.	भावस्पष्ट कीजिए−रहोन भूल के कभीमदांध तुच्छवित्त में,सनाथजान आपको करोन गर्व चित्तमें।अनाथकौन है यहाँ?त्रिलोकनाथसाथ हैं,दयालुदीनबंधु के बड़ेविशाल हाथ हैं।
Answer» भाव स्पष्ट कीजिए − रहो न भूल के कभी मदांध तुच्छ वित्त में, सनाथ जान आपको करो न गर्व चित्त में। अनाथ कौन है यहाँ? त्रिलोकनाथ साथ हैं, दयालु दीनबंधु के बड़े विशाल हाथ हैं।

2156.

भावस्पष्ट कीजिए−रहोन भूल के कभीमदांध तुच्छवित्त में,सनाथजान आपको करोन गर्व चित्तमें।अनाथकौन है यहाँ?त्रिलोकनाथसाथ हैं,दयालुदीनबंधु के बड़ेविशाल हाथ हैं।

Answer»

भाव
स्पष्ट कीजिए
−

रहो
न भूल के कभी
मदांध तुच्छ
वित्त में,

सनाथ
जान आपको करो
न गर्व चित्त
में।

अनाथ
कौन है यहाँ?
त्रिलोकनाथ
साथ हैं,

दयालु
दीनबंधु के बड़े
विशाल हाथ हैं।

Discussion

2157.	A black body emits radiations of maximum intensity at a wavelength of 5000˙A , when the temperature of the body is 12270 C. If the temperature of the body is increased by 1000° C, the maximum intensity of emitted radiation would be observed at
Answer» A black body emits radiations of maximum intensity at a wavelength of $5000 ˙ A$ , when the temperature of the body is $1227^{0}$ C. If the temperature of the body is increased by 1000° C, the maximum intensity of emitted radiation would be observed at

Discussion

2158.	37A variable force, given by the 2-dimensional vector F= (3x^2i+4j), acts on a particle. The force is in newton and x is in metre. What is the change in the kinetic energy of the particle as it moves from the point with coordinates (2, 3) to (3, 0)? ( The coordinates are in metres.)(a) -7J(d) +19 J(c) +7J(b) zero
Answer» 37A variable force, given by the 2-dimensional vector F= (3x^2i+4j), acts on a particle. The force is in newton and x is in metre. What is the change in the kinetic energy of the particle as it moves from the point with coordinates (2, 3) to (3, 0)? ( The coordinates are in metres.)(a) -7J(d) +19 J(c) +7J(b) zero

Discussion

2159.	The velocity-time graph of a particle in straight-line motion is shown in the figure. The particle starts its motion from the origin. The displacement of the particle in 8 s is
Answer» The velocity-time graph of a particle in straight-line motion is shown in the figure. The particle starts its motion from the origin. The displacement of the particle in $8 s$ is

Discussion

2160.	A- if m and mo are moving mas ,rest mass of body and c is velocity of light then kinetic energy of body is E=[m-m0]c2R-total energy of body is sum of kinetic energy and rest mass energy
Answer» A- if m and mo are moving mas ,rest mass of body and c is velocity of light then kinetic energy of body is E=[m-m0]c2 R-total energy of body is sum of kinetic energy and rest mass energy

Discussion

2161.	91.A ball is thrown vertically upward with ba velocity u from the top of a tower.if it strikes the ground with velocity 3u the time taken by the ball to reach the ground is ?
Answer» 91.A ball is thrown vertically upward with ba velocity u from the top of a tower.if it strikes the ground with velocity 3u the time taken by the ball to reach the ground is ?

Discussion

2162.	Resistors R1=10Ω, R2 = 40Ω, R3 = 30Ω, R4 = 20Ω, R5 = 60Ω and a 12V battery is connected as shown.Calculate:(a) the total resistance(b) the total current flowing in the circuit.
Answer» Resistors $R_{1}$ =10 $Ω$ , $R_{2}$ = 40 $Ω$ , $R_{3}$ = 30 $Ω$ , $R_{4}$ = 20 $Ω$ , $R_{5}$ = 60 $Ω$ and a 12V battery is connected as shown. Calculate: (a) the total resistance (b) the total current flowing in the circuit.

2162.

Resistors R1=10Ω, R2 = 40Ω, R3 = 30Ω, R4 = 20Ω, R5 = 60Ω and a 12V battery is connected as shown.Calculate:(a) the total resistance(b) the total current flowing in the circuit.

Answer»

Resistors $R_{1}$ =10 $Ω$ , $R_{2}$ = 40 $Ω$ , $R_{3}$ = 30 $Ω$ , $R_{4}$ = 20 $Ω$ , $R_{5}$ = 60 $Ω$ and a 12V battery is connected as shown.

Calculate:

(a) the total resistance

(b) the total current flowing in the circuit.

Discussion

2163.	Question 86(ii)Sonal and Anmol then made another sequence of the designs. Three of the designs are shown below.Draw a graph of rows and number of white tiles. Draw another graph of the number of rows and the number of purple tiles. Put the number of rows on the Horizontal axis.
Answer» Question 86(ii) Sonal and Anmol then made another sequence of the designs. Three of the designs are shown below. Draw a graph of rows and number of white tiles. Draw another graph of the number of rows and the number of purple tiles. Put the number of rows on the Horizontal axis.

Discussion

2164.	A block of wood floats on water with 1/4 th of its volume above the water surface. The density of the wooden block will be? Take, density of water = 1 gcm−3.
Answer» A block of wood floats on water with 1/4 th of its volume above the water surface. The density of the wooden block will be? Take, density of water = 1 $g c m^{- 3}$ .

2164.

A block of wood floats on water with 1/4 th of its volume above the water surface. The density of the wooden block will be? Take, density of water = 1 gcm−3.

Answer»

A block of wood floats on water with 1/4 th of its volume above the water surface. The density of the wooden block will be?

Take, density of water = 1 $g c m^{- 3}$ .

Discussion

2165.	The three vessels shown in figure have same base area. Equal volumes of a liquid are poured in three vessels. The force on the base will be
Answer» The three vessels shown in figure have same base area. Equal volumes of a liquid are poured in three vessels. The force on the base will be

2165.

The three vessels shown in figure have same base area. Equal volumes of a liquid are poured in three vessels. The force on the base will be

Answer»

The three vessels shown in figure have same base area. Equal volumes of a liquid are poured in three vessels. The force on the base will be

Discussion

2166.	A plane has take off speed of 88.1m/s and requires 1365m to reach that speed . Determine the acceleration of the plane and the time required to reach this speed.
Answer» A plane has take off speed of 88.1m/s and requires 1365m to reach that speed . Determine the acceleration of the plane and the time required to reach this speed.

Discussion

2167.	A ball is rolling from A to D on a ﬂat and smooth surface. Its speed is 2 cm/s. On reaching B, it was pushed continuously up to C. On reaching D from C, its speed had become 4 cm/s. It took 2 seconds for it to go from B to C. What is the acceleration of the ball as it goes from B to C?
Answer» A ball is rolling from A to D on a ﬂat and smooth surface. Its speed is 2 cm/s. On reaching B, it was pushed continuously up to C. On reaching D from C, its speed had become 4 cm/s. It took 2 seconds for it to go from B to C. What is the acceleration of the ball as it goes from B to C?

Discussion

2168.	(a) What do you understand by term "balanced forces" and "unbalanced forces"? Explain with examples.(b) What type of forces - balanced or unbalanced - act on a rubber ball when we press it between our hands? What effect is produced in the ball?
Answer» (a) What do you understand by term "balanced forces" and "unbalanced forces"? Explain with examples. (b) What type of forces - balanced or unbalanced - act on a rubber ball when we press it between our hands? What effect is produced in the ball?

Discussion

2169.	15.A particle is moving along a circle such that it complete one revolution in 40 seconds. In 2 minutes 20 seconds, the ratio displacement/distance is??
Answer» 15.A particle is moving along a circle such that it complete one revolution in 40 seconds. In 2 minutes 20 seconds, the ratio displacement/distance is??

Discussion

2170.	Question 14While sieving grains, small pieces fall down. Which force pulls them down?
Answer» Question 14 While sieving grains, small pieces fall down. Which force pulls them down?

Discussion

2171.	Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major).
Answer» Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major).

Discussion

2172.	4080 grams = ____ kg ____ grams
Answer» 4080 grams = ____ kg ____ grams

Discussion

2173.	A rectangular N turned current carrying coil with area A is rotating in B magnetic field with angular velocity w perpendicularly. Then what will be the emf induced in it?
Answer» A rectangular N turned current carrying coil with area A is rotating in B magnetic field with angular velocity w perpendicularly. Then what will be the emf induced in it?

Discussion

2174.	1.In the figure given, a fluid of density 2000 kg/m3 is flowing in a horizontal pipe. The speed of water at point A is 4cm/s , what is its speed at point B ?
Answer» 1.In the figure given, a fluid of density 2000 kg/m3 is flowing in a horizontal pipe. The speed of water at point A is 4cm/s , what is its speed at point B ?

Discussion

2175.

Rewrite the following table in such a way that column 2 and column 3 will match with column 1. No. Column I Column II Column III 1. Transverse wave (a) Particles oscillate parallel to direction of propagation (i) Wave produced in slinky. 2. Longitudinal wave. (b) Particles oscillate perpendicular to direction of propagation (ii) Frequency less than 20 Hz. 3. Ultrasound. (c) Echo formation is heard under particular conditions. (iii) Wave produced in string 4. Infrasound (d) High frequency waves. (iv) Frequency between 20 Hz and 20000 Hz 5. Audible frequency (e) Low frequency waves (v) Frequency greater than 20000 Hz.

Answer»

Rewrite the following table in such a way that column 2 and column 3 will match with column 1.

No.	Column I	Column II		Column III
1.	Transverse wave	(a)	Particles oscillate parallel to direction of propagation	(i)	Wave produced in slinky.
2.	Longitudinal wave.	(b)	Particles oscillate perpendicular to direction of propagation	(ii)	Frequency less than 20 Hz.
3.	Ultrasound.	(c)	Echo formation is heard under particular conditions.	(iii)	Wave produced in string
4.	Infrasound	(d)	High frequency waves.	(iv)	Frequency between 20 Hz and 20000 Hz
5.	Audible frequency	(e)	Low frequency waves	(v)	Frequency greater than 20000 Hz.

Discussion

2176.	The angular momentum of a particle about origin is varying as L = 4t +8 (Sl units) when it moves along a straight line y = x - 4 (x,y in meters).The magnitude of force acting on the particle wouid be:
Answer» The angular momentum of a particle about origin is varying as L = 4t +8 (Sl units) when it moves along a straight line y = x - 4 (x,y in meters).The magnitude of force acting on the particle wouid be:

Discussion

2177.	What is the principle of lactometer ?
Answer» What is the principle of lactometer ?

Discussion

2178.	What kind of energy transformations take place at hydroelectric power station ?
Answer» What kind of energy transformations take place at hydroelectric power station ?

Discussion

2179.	An aeroplane lands on a runway with a velocity of 50 m/s. It decelerates at 10 m/s2 to a velocity of 20 m/s. Find the time elapsed.
Answer» An aeroplane lands on a runway with a velocity of 50 m/s. It decelerates at 10 m/s²to a velocity of 20 m/s. Find the time elapsed.

Discussion

2180.	speedinkilometerperhourinS.I.unitisrepresentedas(a)KMPH(c)Kmh^-1(b)Kmhr^-1(d)kilometer/hour
Answer» speedinkilometerperhourinS.I.unitisrepresentedas(a)KMPH(c)Kmh^-1(b)Kmhr^-1(d)kilometer/hour

Discussion

2181.	How long would it take to a wave of frequency 6×10^14 s^-1 to travel a distance between Earth and Sun and Its 3 times distances.
Answer» How long would it take to a wave of frequency 6×10^14 s^-1 to travel a distance between Earth and Sun and Its 3 times distances.

Discussion

2182.	Why is the value of gravitational constant 6.67×10−11?
Answer» Why is the value of gravitational constant $6.67 \times 10^{- 11}$ ?

Discussion

2183.	A single phase bridge converter with a free wheeling diode feeds an R-L load. The load resistance is 20 Ω and inductance is very large providing ripple free load current. The converter is supplied by 220 V, 1−ϕ supply at a frequency of 50 Hz. The average value of the thyristor current when firing angle is 60∘ will be
Answer» A single phase bridge converter with a free wheeling diode feeds an R-L load. The load resistance is $20 Ω$ and inductance is very large providing ripple free load current. The converter is supplied by $220 V, 1 - ϕ$ supply at a frequency of $50 H z$ . The average value of the thyristor current when firing angle is $60^{\circ}$ will be

Discussion

2184.	2. The ratio of the specific heats Cp/Cv=Gama in terms of degrees of freedom (n) is given by?
Answer» 2. The ratio of the specific heats Cp/Cv=Gama in terms of degrees of freedom (n) is given by?

Discussion

2185.	Two point charges Q1 and Q2 exerts force F on each other, when kept at certain distance apart. If the charge on each particle is halved and the distance between them is doubled, then the new force between the two particles would be
Answer» Two point charges $Q_{1}$ and $Q_{2}$ exerts force $F$ on each other, when kept at certain distance apart. If the charge on each particle is halved and the distance between them is doubled, then the new force between the two particles would be

Discussion

2186.	A boy have a mass of 50 kg. What would be his weight on the Earth? (g = 10 ms−2)
Answer» A boy have a mass of 50 kg. What would be his weight on the Earth? ( $g = 10 m s^{- 2}$ )

Discussion

2187.	Question 7Earthquake produces which kind of sound before the main shock wave begins(a) ultrasound(b) infrasound(c) audible sound(d) none of the above
Answer» Question 7 Earthquake produces which kind of sound before the main shock wave begins (a) ultrasound (b) infrasound (c) audible sound (d) none of the above

Discussion

2188.	If suns gravitation is more than earth.so why doesn't the moon revolve around the sun
Answer» If suns gravitation is more than earth.so why doesn't the moon revolve around the sun

Discussion

2189.	Heat energy dissipated across a conductor carrying current I, having resistance R for a time t, is given by:
Answer» Heat energy dissipated across a conductor carrying current I, having resistance R for a time t, is given by:

Discussion

2190.	Relativity that a body that has infinite mass can travel at light velocity. What is the meaning of infinite mass? Doesn't it has any value?
Answer» Relativity that a body that has infinite mass can travel at light velocity. What is the meaning of infinite mass? Doesn't it has any value?

Discussion

2191.	An air column is closed in a tube sealed at one end by a Hg column having length 8cm. When the tube is placed with its open end downward the height of air column is 20cm.If the tube is turned so that its open end is the top, the height of air column is 16cm. Find the atmospheric pressure
Answer» An air column is closed in a tube sealed at one end by a Hg column having length 8cm. When the tube is placed with its open end downward the height of air column is 20cm.If the tube is turned so that its open end is the top, the height of air column is 16cm. Find the atmospheric pressure

Discussion

2192.	80. A liquid does not wet the solid surface if the angle ofcontact is(b) equal to 45(d) greater than 90^° (a) zero(c) equal to 90^°
Answer» 80. A liquid does not wet the solid surface if the angle ofcontact is(b) equal to 45(d) greater than 90^° (a) zero(c) equal to 90^°

Discussion

2193.	A symmetric biconvex lens of radius of curvature R and made of glass of refractive index 1.5, is placed on a layer of liquid placed on top of a plane mirror as shown in the figure. An optical needle with its tip on the principal axis of the lens is moved along the axis until its real, inverted image coincides with the needle itslelf. The distance of the needle from the lens is measured to be x. On removing the liquid layer and repeating the experiment, the distance is found to be y. Obtain the expression for the refractive index of the liquid in terms of x and y.
Answer» A symmetric biconvex lens of radius of curvature R and made of glass of refractive index 1.5, is placed on a layer of liquid placed on top of a plane mirror as shown in the figure. An optical needle with its tip on the principal axis of the lens is moved along the axis until its real, inverted image coincides with the needle itslelf. The distance of the needle from the lens is measured to be x. On removing the liquid layer and repeating the experiment, the distance is found to be y. Obtain the expression for the refractive index of the liquid in terms of x and y.

Discussion

2194.	Question 2According to the third law of motion, action and reaction(a) always act on the same body(b) always act on different bodies in opposite directions(c) have same magnitude and directions(d) act on either body at normal to each other
Answer» Question 2 According to the third law of motion, action and reaction (a) always act on the same body (b) always act on different bodies in opposite directions (c) have same magnitude and directions (d) act on either body at normal to each other

Discussion

2195.	Is the speed of sound more in water or in steel ?
Answer» Is the speed of sound more in water or in steel ?

Discussion

2196.	In the oil tankers some space is left at the top while filling them. Explain.
Answer» In the oil tankers some space is left at the top while filling them. Explain.

Discussion

2197.	A hawk of mass 10 kg dives to catch a mouse. During dive it loses 500 J of its potential energy. The height from where it begins its dive is (take g = 10 m/s2)
Answer» A hawk of mass 10 kg dives to catch a mouse. During dive it loses 500 J of its potential energy. The height from where it begins its dive is (take g = 10 m/s²)

Discussion

2198.	{ 2. A projectile is thrown with a velocity of }10ms^{-1} at an angle of }}{60^° with horizontal. The interval between the moments when }}{ speed is }\sqrt{5g}m/s is (Take, }g=10ms^{-2})
Answer» { 2. A projectile is thrown with a velocity of }10ms^{-1} at an angle of }}{60^° with horizontal. The interval between the moments when }}{ speed is }\sqrt{5g}m/s is (Take, }g=10ms^{-2})

Discussion

2199.	Question 1What is the nature of the distance-time graphs for uniform and non-uniform motion of an object?
Answer» Question 1 What is the nature of the distance-time graphs for uniform and non-uniform motion of an object?

Discussion

2200.	10. A force vector f=vector v × vector A is exerted on a particles in addition to the force of gravity, where vector v is the velocity of the particlesand vector A is a constant vector in the horizontal direction. With what minimum speed a particle of mass m be projected so that it continues to move undeflected with a constant
Answer» 10. A force vector f=vector v × vector A is exerted on a particles in addition to the force of gravity, where vector v is the velocity of the particlesand vector A is a constant vector in the horizontal direction. With what minimum speed a particle of mass m be projected so that it continues to move undeflected with a constant

Discussion

Explore topic-wise InterviewSolutions in .

What actually is differentiation and derivativative?Does derivative give the speed in position-time graph? Suppose f(x) (position/distance) = x^2 where x is time. Then the derivativative of this this function i.e. 2x is it equal to the speed?

Two different bodies are completely immersed in water and undergo the same loss in weight.It is necessary that their weights in air should be the same ? Explain.

A 1-kg object is lying on the ground. An unbalanced force of magnitude 1 N is applied to the object. Which of these options explains the motion of the object as a result of the acting force?

Question 28 (iii)B1, B2 and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. (iii) How much power is dissipated in the circuit when all the three bulbs glow together?

A black body emits radiations of maximum intensity at a wavelength of 5000˙A , when the temperature of the body is 12270 C. If the temperature of the body is increased by 1000° C, the maximum intensity of emitted radiation would be observed at

The velocity-time graph of a particle in straight-line motion is shown in the figure. The particle starts its motion from the origin. The displacement of the particle in 8 s is

A- if m and mo are moving mas ,rest mass of body and c is velocity of light then kinetic energy of body is E=[m-m0]c2R-total energy of body is sum of kinetic energy and rest mass energy

91.A ball is thrown vertically upward with ba velocity u from the top of a tower.if it strikes the ground with velocity 3u the time taken by the ball to reach the ground is ?

Resistors R1=10Ω, R2 = 40Ω, R3 = 30Ω, R4 = 20Ω, R5 = 60Ω and a 12V battery is connected as shown.Calculate:(a) the total resistance(b) the total current flowing in the circuit.

Question 86(ii)Sonal and Anmol then made another sequence of the designs. Three of the designs are shown below.​Draw a graph of rows and number of white tiles. Draw another graph of the number of rows and the number of purple tiles. Put the number of rows on the Horizontal axis.

A block of wood floats on water with 1/4 th of its volume above the water surface. The density of the wooden block will be? Take, density of water = 1 gcm−3.

The three vessels shown in figure have same base area. Equal volumes of a liquid are poured in three vessels. The force on the base will be

A plane has take off speed of 88.1m/s and requires 1365m to reach that speed . Determine the acceleration of the plane and the time required to reach this speed.

A ball is rolling from A to D on a ﬂat and smooth surface. Its speed is 2 cm/s. On reaching B, it was pushed continuously up to C. On reaching D from C, its speed had become 4 cm/s. It took 2 seconds for it to go from B to C. What is the acceleration of the ball as it goes from B to C?

(a) What do you understand by term "balanced forces" and "unbalanced forces"? Explain with examples.(b) What type of forces - balanced or unbalanced - act on a rubber ball when we press it between our hands? What effect is produced in the ball?

15.A particle is moving along a circle such that it complete one revolution in 40 seconds. In 2 minutes 20 seconds, the ratio displacement/distance is??

Question 14While sieving grains, small pieces fall down. Which force pulls them down?

Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major).

4080 grams = ____ kg ____ grams

A rectangular N turned current carrying coil with area A is rotating in B magnetic field with angular velocity w perpendicularly. Then what will be the emf induced in it?

1.In the figure given, a fluid of density 2000 kg/m3 is flowing in a horizontal pipe. The speed of water at point A is 4cm/s , what is its speed at point B ?

The angular momentum of a particle about origin is varying as L = 4t +8 (Sl units) when it moves along a straight line y = x - 4 (x,y in meters).The magnitude of force acting on the particle wouid be:

What is the principle of lactometer ?

What kind of energy transformations take place at hydroelectric power station ?

An aeroplane lands on a runway with a velocity of 50 m/s. It decelerates at 10 m/s2 to a velocity of 20 m/s. Find the time elapsed.

speedinkilometerperhourinS.I.unitisrepresentedas(a)KMPH(c)Kmh^-1(b)Kmhr^-1(d)kilometer/hour

How long would it take to a wave of frequency 6×10^14 s^-1 to travel a distance between Earth and Sun and Its 3 times distances.

Why is the value of gravitational constant 6.67×10−11?

2. The ratio of the specific heats Cp/Cv=Gama in terms of degrees of freedom (n) is given by?

Two point charges Q1 and Q2 exerts force F on each other, when kept at certain distance apart. If the charge on each particle is halved and the distance between them is doubled, then the new force between the two particles would be

A boy have a mass of 50 kg. What would be his weight on the Earth? (g = 10 ms−2)

Question 7Earthquake produces which kind of sound before the main shock wave begins(a) ultrasound(b) infrasound(c) audible sound(d) none of the above

If suns gravitation is more than earth.so why doesn't the moon revolve around the sun

Heat energy dissipated across a conductor carrying current I, having resistance R for a time t, is given by:

Relativity that a body that has infinite mass can travel at light velocity. What is the meaning of infinite mass? Doesn't it has any value?

An air column is closed in a tube sealed at one end by a Hg column having length 8cm. When the tube is placed with its open end downward the height of air column is 20cm.If the tube is turned so that its open end is the top, the height of air column is 16cm. Find the atmospheric pressure

80. A liquid does not wet the solid surface if the angle ofcontact is(b) equal to 45(d) greater than 90^° (a) zero(c) equal to 90^°

Question 2According to the third law of motion, action and reaction(a) always act on the same body(b) always act on different bodies in opposite directions(c) have same magnitude and directions(d) act on either body at normal to each other

Is the speed of sound more in water or in steel ?

In the oil tankers some space is left at the top while filling them. Explain.

A hawk of mass 10 kg dives to catch a mouse. During dive it loses 500 J of its potential energy. The height from where it begins its dive is (take g = 10 m/s2)

{ 2. A projectile is thrown with a velocity of }10ms^{-1} at an angle of }}{60^° with horizontal. The interval between the moments when }}{ speed is }\sqrt{5g}m/s is (Take, }g=10ms^{-2})

Question 1What is the nature of the distance-time graphs for uniform and non-uniform motion of an object?

Question 86(ii)Sonal and Anmol then made another sequence of the designs. Three of the designs are shown below.Draw a graph of rows and number of white tiles. Draw another graph of the number of rows and the number of purple tiles. Put the number of rows on the Horizontal axis.

4080 grams = kg grams