9478 + Interview Questions in Physics Page 96 InterviewSolution

4751.	am×bm is equal toA.(ab)B.(ab)mC.(ab)0D ((ab)m)2
Answer» $a^{m} \times b^{m}$ is equal to A. $(a b)$ B. $(a b)^{m}$ C. $(a b)^{0}$ D $((a b)^{m})^{2}$

4751.

am×bm is equal toA.(ab)B.(ab)mC.(ab)0D ((ab)m)2

Answer»

$a^{m} \times b^{m}$ is equal to

A. $(a b)$

B. $(a b)^{m}$

C. $(a b)^{0}$

D $((a b)^{m})^{2}$

Discussion

4752.	0.5 kg of water is heated from 20 ∘C to 70 ∘C. If the specific heat of water is 4200 Jkg.K, determine the change in internal energy of water.
Answer» $0.5 k g$ of water is heated from $20^{\circ} C$ to $70^{\circ} C$ . If the specific heat of water is $4200 \frac{J}{k g . K}$ , determine the change in internal energy of water.

Discussion

4753.	A particle is dropped from the rop of a tower. the dis†an ce covered by it in the last one second is ewual to that covered by it in the first three seconds.Find the height of the tower
Answer» A particle is dropped from the rop of a tower. the dis†an ce covered by it in the last one second is ewual to that covered by it in the first three seconds.Find the height of the tower

Discussion

4754.	a hollow sphere is released from rest on rough inclined surface of inclinationn theta. if coefficient of friction is u then maximum value of theta so that the sphere rolls without slipping
Answer» a hollow sphere is released from rest on rough inclined surface of inclinationn theta. if coefficient of friction is u then maximum value of theta so that the sphere rolls without slipping

Discussion

4755.	Question 16Meteors are not visible during the daytime. Explain the reason.
Answer» Question 16 Meteors are not visible during the daytime. Explain the reason.

Discussion

4756.	Can an object have mechanical energy even if its momentum is zero? Explain.
Answer» Can an object have mechanical energy even if its momentum is zero? Explain.

Discussion

4757.	Can some people really hear sounds above 20000 Hz?
Answer» Can some people really hear sounds above 20000 Hz?

Discussion

4758.	3. If two cells of emf e1 and e2 are connected in parallel with same polarity such that e1 is greater then e2 then effective emf will be ??
Answer» 3. If two cells of emf e1 and e2 are connected in parallel with same polarity such that e1 is greater then e2 then effective emf will be ??

Discussion

4759.	Which of the following is not a no-contact force ? (a) electrostatic force (b) gravitational force (c) frictional force (d) magnetic force
Answer» Which of the following is not a no-contact force ? (a) electrostatic force (b) gravitational force (c) frictional force (d) magnetic force

Discussion

4760.	two wires of diameter 0.25cm,one made of steel and the other made of brass are loaded. the unloaded length of steel wire is 1.5m and that of ass wire is 1.0m.compute the elongation of steel amd theass w
Answer» two wires of diameter 0.25cm,one made of steel and the other made of brass are loaded. the unloaded length of steel wire is 1.5m and that of ass wire is 1.0m.compute the elongation of steel amd theass w

Discussion

4761.	a person A is moving 30 degree south of east with 20m/s and another person B is moving 30 degree north of wesr with speed 20m/s. Find out velocity of A with respect to B
Answer» a person A is moving 30 degree south of east with 20m/s and another person B is moving 30 degree north of wesr with speed 20m/s. Find out velocity of A with respect to B

Discussion

4762.	if a sphere is placed inside a concentric conducting shell the electric field between them?shouldnt it be zero as electric field due to shell inside is 0 even if sphere is kept inside?/
Answer» if a sphere is placed inside a concentric conducting shell the electric field between them? shouldnt it be zero as electric field due to shell inside is 0 even if sphere is kept inside?/

Discussion

4763.	Explain the apparent flattening of the Sun's disc at sunrise and sunset with the help of a diagram. What is Sun's disc?
Answer» Explain the apparent flattening of the Sun's disc at sunrise and sunset with the help of a diagram. What is Sun's disc?

Discussion

4764.	Why Lorries And Trucks Carrying Heavy Loads have 8 tyres instead of Four ??
Answer» Why Lorries And Trucks Carrying Heavy Loads have 8 tyres instead of Four ??

Discussion

4765.	What is the physical significance of refractive index?
Answer» What is the physical significance of refractive index?

Discussion

4766.	Which has high ionization energy: oxygen or chlorine??
Answer» Which has high ionization energy: oxygen or chlorine??

Discussion

4767.	does lily has both rhizome and bulb?if yes then how?
Answer» does lily has both rhizome and bulb?if yes then how?

Discussion

4768.	The water in a bottle leaks through a hole. If the volume of water at any time is represented by the shaded part of the models below, find the volume of water in the bottle at 10:02 AM.
Answer» The water in a bottle leaks through a hole. If the volume of water at any time is represented by the shaded part of the models below, find the volume of water in the bottle at 10:02 AM.

Discussion

4769.	In which direction will the rope move ifa. Girl's team is winningb. Both the teams apply an equal force? [2 MARKS]
Answer» In which direction will the rope move if a. Girl's team is winning b. Both the teams apply an equal force? [2 MARKS]

4769.

In which direction will the rope move ifa. Girl's team is winningb. Both the teams apply an equal force? [2 MARKS]

Answer»

In which direction will the rope move if

a. Girl's team is winning

b. Both the teams apply an equal force? [2 MARKS]

Discussion

4770.	3.The x-t graph of an object is given below calculate the velocity of the object
Answer» 3.The x-t graph of an object is given below calculate the velocity of the object

Discussion

4771.	When a glass rod rubbed with silk is brought near a charged plastic straw rubbed with polythene there is an attraction between the two. Identify the charge on the plastic straw.
Answer» When a glass rod rubbed with silk is brought near a charged plastic straw rubbed with polythene there is an attraction between the two. Identify the charge on the plastic straw.

Discussion

4772.	Two boys were playing with a ball on a level ground. One of the boys throws the ball on the third floor of the building which is at a height of 5 m and the other boy manages to throw on the fourth floor which is at a height of 7 m from the level ground. Find the ratio of the work done by both the boys?
Answer» Two boys were playing with a ball on a level ground. One of the boys throws the ball on the third floor of the building which is at a height of 5 m and the other boy manages to throw on the fourth floor which is at a height of 7 m from the level ground. Find the ratio of the work done by both the boys?

Discussion

4773.	There are two holes one each along the opposite sides of a wide rectangular tank.The cross section of each hole is 0.01m2 and the vertical distance between holes is one metre.The tank is filled with water .The net force on the tank in newton when the water flows out of the holes is 1)100 2)200 3)300 4)400
Answer» There are two holes one each along the opposite sides of a wide rectangular tank.The cross section of each hole is 0.01m2 and the vertical distance between holes is one metre.The tank is filled with water .The net force on the tank in newton when the water flows out of the holes is 1)100 2)200 3)300 4)400

Discussion

4774.	What is the purpose of using ball bearings in machines?
Answer» What is the purpose of using ball bearings in machines?

Discussion

4775.	The critical angle for a light ray traveling from denser to rarer medium is defined as the angle of incidence at which the light refracts at 90°(angle of refraction). If a ray of light travels from water (μw) to air (μa). Find the critical angle?
Answer» The critical angle for a light ray traveling from denser to rarer medium is defined as the angle of incidence at which the light refracts at 90°(angle of refraction). If a ray of light travels from water (μ_w) to air (μ_a). Find the critical angle?

4775.

The critical angle for a light ray traveling from denser to rarer medium is defined as the angle of incidence at which the light refracts at 90°(angle of refraction). If a ray of light travels from water (μw) to air (μa). Find the critical angle?

Answer»

The critical angle for a light ray traveling from denser to rarer medium is defined as the angle of incidence at which the light refracts at 90°(angle of refraction).

If a ray of light travels from water (μ_w) to air (μ_a). Find the critical angle?

Discussion

4776.	A 60 m long train moving with constant speed on a straight level track passes a pole in 5 s. The time it will take to cross a 540 m long bridge is:50
Answer» A $60 m$ long train moving with constant speed on a straight level track passes a pole in $5 s$ . The time it will take to cross a $540 m$ long bridge is: 50

Discussion

4777.	A constant force 'F' is applied on block 'm' kept on a smooth surface (horizontal). Find the speed of the block and energy stored in the spring at equilibrium. Also find the speed of the block at anyelongation x.
Answer» A constant force 'F' is applied on block 'm' kept on a smooth surface (horizontal). Find the speed of the block and energy stored in the spring at equilibrium. Also find the speed of the block at anyelongation x.

Discussion

4778.	What are the forces acting on a person who is swimming
Answer» What are the forces acting on a person who is swimming

Discussion

4779.	What is the cause of friction?
Answer» What is the cause of friction?

Discussion

4780.	Question 4A toy car released with the same initial speed will travel farthest on(a) muddy surface(b) polished marble surface (c) cemented surface(d) brick surface
Answer» Question 4 A toy car released with the same initial speed will travel farthest on (a) muddy surface (b) polished marble surface (c) cemented surface (d) brick surface

Discussion

4781.	In an industrial process 10 kg of water per hour is to be heated from 20∘C to 80∘C. To do this steam at 150∘C is passed from a boiler into a copper coil immersed in water. The steam condenses in the coil and is returned to the boiler as water at 90∘C. then___ kg of steam is required per hour. (Specific heat of steam = 1 calorie per gm°C, Latent heat of vaporization = 540 cal/gm)
Answer» In an industrial process $10 k g$ of water per hour is to be heated from $20^{\circ} C t o 80^{\circ} C .$ To do this steam at $150^{\circ} C$ is passed from a boiler into a copper coil immersed in water. The steam condenses in the coil and is returned to the boiler as water at $90^{\circ} C .$ then___ $k g$ of steam is required per hour. (Specific heat of steam = 1 calorie per gm°C, Latent heat of vaporization = 540 cal/gm)

Discussion

4782.	A student carries out the experiment for studying the dependence of current (I) flowing through a resistor system of R1 and R2 on the potential difference (V) applied to it by connecting the resistor system to points X and Y of the measuring circuit as shown:The average value of the ratio V/I, of his observations, would then be equal(1) only in cases A and B(2) only in cases B and C(3) only in cases C and A(4) all the three cases
Answer» A student carries out the experiment for studying the dependence of current (I) flowing through a resistor system of R₁ and R₂ on the potential difference (V) applied to it by connecting the resistor system to points X and Y of the measuring circuit as shown: The average value of the ratio V/I, of his observations, would then be equal (1) only in cases A and B (2) only in cases B and C (3) only in cases C and A (4) all the three cases

Discussion

4783.	Calculate the heat required to heat 0.5 kg of water from 20 ∘C to 70 ∘C. If the specific heat of water is 4200 Jkg.K.
Answer» Calculate the heat required to heat $0.5 k g$ of water from $20^{\circ} C$ to $70^{\circ} C$ . If the specific heat of water is $4200 \frac{J}{k g . K}$ .

Discussion

4784.	Question 3Under which of the conditions a concave mirror can form a real image larger than the actual object?(a) When the object is kept at a distance equal to its radius of curvature.(b) When object is kept at a distance less than its focal length.(c) When object is placed between the focus and centre of curvature. (d) When object is kept at a distance greater than its radius of curvature.
Answer» Question 3 Under which of the conditions a concave mirror can form a real image larger than the actual object? (a) When the object is kept at a distance equal to its radius of curvature. (b) When object is kept at a distance less than its focal length. (c) When object is placed between the focus and centre of curvature. (d) When object is kept at a distance greater than its radius of curvature.

Discussion

4785.	Two beams of light having intensity I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is π2 at a point A and 2π at point B. The difference between the resultant intensities at B and A will be,
Answer» Two beams of light having intensity $I$ and $4 I$ interfere to produce a fringe pattern on a screen. The phase difference between the beams is $\frac{π}{2}$ at a point $A$ and $2 π$ at point $B$ . The difference between the resultant intensities at $B$ and $A$ will be,

Discussion

4786.	As in the solar furnaces concave mirror is used for converting the sun's rays. Can we use convex lens for converging the days?
Answer» As in the solar furnaces concave mirror is used for converting the sun's rays. Can we use convex lens for converging the days?

Discussion

4787.	A copper wire of resis†an ce R_ois streched till its length is increased to n times of its original length. what will be its new resis†an ce?
Answer» A copper wire of resis†an ce R_ois streched till its length is increased to n times of its original length. what will be its new resis†an ce?

Discussion

4788.	Explain the statement- In a straight line motion it is possible that acceleration is reverting back it's direction but velocity is not and vice versa.
Answer» Explain the statement- In a straight line motion it is possible that acceleration is reverting back it's direction but velocity is not and vice versa.

Discussion

4789.	Define Natural satellite.
Answer» Define Natural satellite.

Discussion

4790.	An object moving with a uniform velocity of 40 ms−1 comes to rest in 10 s. What is the acceleration?
Answer» An object moving with a uniform velocity of $40 m s^{- 1}$ comes to rest in $10 s$ . What is the acceleration?

Discussion

4791.	There are seconds in 3 minutes.
Answer» There are seconds in 3 minutes.

Discussion

4792.	Which of the following forces does not describe contact force?
Answer» Which of the following forces does not describe contact force?

Discussion

4793.	The edge of an aluminium cube is 10 cm long.One face of the cube is firmly fixed to a verticalwall. A mass of 100 kg is then attached to theopposite face of the cube. The shear modulusof aluminium is 25 GPa. Then is the verticaldeflection of this face1) 3x10-7m3) 810-7 m2) 4x 10-7nm4) 2x10 /m
Answer» The edge of an aluminium cube is 10 cm long.One face of the cube is firmly fixed to a verticalwall. A mass of 100 kg is then attached to theopposite face of the cube. The shear modulusof aluminium is 25 GPa. Then is the verticaldeflection of this face1) 3x10-7m3) 810-7 m2) 4x 10-7nm4) 2x10 /m

Discussion

4794.	desert sky
Answer» desert sky

Discussion

4795.	Show that there can be no net charge in a region in which the electric feild is uniform at all points
Answer» Show that there can be no net charge in a region in which the electric feild is uniform at all points

Discussion

4796.	(a) What is an earthquake? What are the two main situations in which earthquakes occur? (b) Define (i) focus, and (ii) epicentre, of an earthquake. (c) What are the various effects of an earthquake?
Answer» (a) What is an earthquake? What are the two main situations in which earthquakes occur? (b) Define (i) focus, and (ii) epicentre, of an earthquake. (c) What are the various effects of an earthquake?

4796.

(a) What is an earthquake? What are the two main situations in which earthquakes occur? (b) Define (i) focus, and (ii) epicentre, of an earthquake. (c) What are the various effects of an earthquake?

Answer»

(a) What is an earthquake? What are the two main situations in which earthquakes occur?

(b) Define (i) focus, and (ii) epicentre, of an earthquake.

(c) What are the various effects of an earthquake?

Discussion

4797.	For the beam having a uniformly distributed load of w per unit length as shown in the given figure, the maximum positive bending moment is equal to maximum negative bending moment. The value of L1 and L for this condition is :
Answer» For the beam having a uniformly distributed load of w per unit length as shown in the given figure, the maximum positive bending moment is equal to maximum negative bending moment. The value of $L_{1}$ and L for this condition is :

Discussion

4798.	Question 1Illustarte the following effects of electric current:(a) Heating effect(b) Chemical effect(c) Magnetic effect
Answer» Question 1 Illustarte the following effects of electric current: (a) Heating effect (b) Chemical effect (c) Magnetic effect

Discussion

4799.	Two masses m1 kg and m2kg passes over a puley.Find the ratio of masses m1 and m2 so that string passes over the pulley will just start slipping over its surface. \lbrack friction coeff. b.w string and pulley=0.2
Answer» Two masses m1 kg and m2kg passes over a puley.Find the ratio of masses m1 and m2 so that string passes over the pulley will just start slipping over its surface. \lbrack friction coeff. b.w string and pulley=0.2

Discussion

4800.	Explain the causes of the friction and the factors on which it depends.
Answer» Explain the causes of the friction and the factors on which it depends.

Discussion

Explore topic-wise InterviewSolutions in .

am×bm is equal to​A.(ab)B.(ab)mC.(ab)0D ((ab)m)2

0.5 kg of water is heated from 20 ∘C to 70 ∘C. If the specific heat of water is 4200 Jkg.K, determine the change in internal energy of water.

A particle is dropped from the rop of a tower. the dis†an ce covered by it in the last one second is ewual to that covered by it in the first three seconds.Find the height of the tower

a hollow sphere is released from rest on rough inclined surface of inclinationn theta. if coefficient of friction is u then maximum value of theta so that the sphere rolls without slipping

Question 16Meteors are not visible during the daytime. Explain the reason.

Can an object have mechanical energy even if its momentum is zero? Explain.

Can some people really hear sounds above 20000 Hz?

3. If two cells of emf e1 and e2 are connected in parallel with same polarity such that e1 is greater then e2 then effective emf will be ??

Which of the following is not a no-contact force ? (a) electrostatic force (b) gravitational force (c) frictional force (d) magnetic force

two wires of diameter 0.25cm,one made of steel and the other made of brass are loaded. the unloaded length of steel wire is 1.5m and that of ass wire is 1.0m.compute the elongation of steel amd theass w

a person A is moving 30 degree south of east with 20m/s and another person B is moving 30 degree north of wesr with speed 20m/s. Find out velocity of A with respect to B

if a sphere is placed inside a concentric conducting shell the electric field between them?shouldnt it be zero as electric field due to shell inside is 0 even if sphere is kept inside?/

Explain the apparent flattening of the Sun's disc at sunrise and sunset with the help of a diagram. What is Sun's disc?

Why Lorries And Trucks Carrying Heavy Loads have 8 tyres instead of Four ??

What is the physical significance of refractive index?

Which has high ionization energy: oxygen or chlorine??

does lily has both rhizome and bulb?if yes then how?

The water in a bottle leaks through a hole. If the volume of water at any time is represented by the shaded part of the models below, find the volume of water in the bottle at 10:02 AM.

In which direction will the rope move ifa. Girl's team is winningb. Both the teams apply an equal force? [2 MARKS]

3.The x-t graph of an object is given below calculate the velocity of the object

When a glass rod rubbed with silk is brought near a charged plastic straw rubbed with polythene there is an attraction between the two. Identify the charge on the plastic straw.

What is the purpose of using ball bearings in machines?

The critical angle for a light ray traveling from denser to rarer medium is defined as the angle of incidence at which the light refracts at 90°(angle of refraction). If a ray of light travels from water (μw) to air (μa). Find the critical angle?

A 60 m long train moving with constant speed on a straight level track passes a pole in 5 s. The time it will take to cross a 540 m long bridge is:50

A constant force 'F' is applied on block 'm' kept on a smooth surface (horizontal). Find the speed of the block and energy stored in the spring at equilibrium. Also find the speed of the block at anyelongation x.

What are the forces acting on a person who is swimming

What is the cause of friction?

Question 4A toy car released with the same initial speed will travel farthest on(a) muddy surface(b) polished marble surface (c) cemented surface(d) brick surface

Calculate the heat required to heat 0.5 kg of water from 20 ∘C to 70 ∘C. If the specific heat of water is 4200 Jkg.K.

Two beams of light having intensity I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is π2 at a point A and 2π at point B. The difference between the resultant intensities at B and A will be,

As in the solar furnaces concave mirror is used for converting the sun's rays. Can we use convex lens for converging the days?

A copper wire of resis†an ce R_ois streched till its length is increased to n times of its original length. what will be its new resis†an ce?

Explain the statement- In a straight line motion it is possible that acceleration is reverting back it's direction but velocity is not and vice versa.

Define Natural satellite.

An object moving with a uniform velocity of 40 ms−1 comes to rest in 10 s. What is the acceleration?

There are seconds in 3 minutes.

Which of the following forces does not describe contact force?

The edge of an aluminium cube is 10 cm long.One face of the cube is firmly fixed to a verticalwall. A mass of 100 kg is then attached to theopposite face of the cube. The shear modulusof aluminium is 25 GPa. Then is the verticaldeflection of this face1) 3x10-7m3) 810-7 m2) 4x 10-7nm4) 2x10 /m

desert sky

Show that there can be no net charge in a region in which the electric feild is uniform at all points

(a) What is an earthquake? What are the two main situations in which earthquakes occur? (b) Define (i) focus, and (ii) epicentre, of an earthquake. (c) What are the various effects of an earthquake?

For the beam having a uniformly distributed load of w per unit length as shown in the given figure, the maximum positive bending moment is equal to maximum negative bending moment. The value of L1 and L for this condition is :

Question 1Illustarte the following effects of electric current:(a) Heating effect(b) Chemical effect(c) Magnetic effect

Two masses m1 kg and m2kg passes over a puley.Find the ratio of masses m1 and m2 so that string passes over the pulley will just start slipping over its surface. \lbrack friction coeff. b.w string and pulley=0.2

Explain the causes of the friction and the factors on which it depends.

am×bm is equal toA.(ab)B.(ab)mC.(ab)0D ((ab)m)2