13232 + Interview Questions in Physics Page 69 InterviewSolution

3401.	Find the momentum of a body of mass 100 g having a kinetic energy of 20 J.
Answer» Find the momentum of a body of mass 100 g having a kinetic energy of 20 J.

Discussion

3402.	Draw the ray diagram. [2 Mark]
Answer» Draw the ray diagram. [2 Mark]

Discussion

3403.	Question 07 Angle of incidence is equal to the angle of reflection.a. Alwaysb. Sometimesc. Under special circumstancesd. Never
Answer» Question 07 Angle of incidence is equal to the angle of reflection. a. Always b. Sometimes c. Under special circumstances d. Never

Discussion

3404.	What is the difference between a low pitched and high pitched sound?
Answer» What is the difference between a low pitched and high pitched sound?

Discussion

3405.	The front and rear end of a train crosses a pole with the speed "u" and "v" respectively. Find the speed with which the mid point of the train crosses the pole?
Answer» The front and rear end of a train crosses a pole with the speed "u" and "v" respectively. Find the speed with which the mid point of the train crosses the pole?

Discussion

3406.	A beaker containing water is placed on the platform of a spring balance. The platform-balance reads 1.5 kg. A stone of mass 0.5 kg and density 104 kg/m3 is immersed in water without touching the walls of the beaker. What will the platform-balance read now?
Answer» A beaker containing water is placed on the platform of a spring balance. The platform-balance reads $1.5 kg$ . A stone of mass $0.5 kg$ and density $10^{4} {kg/m}^{3}$ is immersed in water without touching the walls of the beaker. What will the platform-balance read now?

Discussion

3407.	The periodic time of a simple pendulum is proportional to
Answer» The periodic time of a simple pendulum is proportional to

Discussion

3408.	Who firstly discovered proton ? E.goldstein or rutherford and how?
Answer» Who firstly discovered proton ? E.goldstein or rutherford and how?

Discussion

3409.	Fill in the blanks.1. Living things in the environment are ……………. factors.2. Biotic factors, abiotic factors and their interactions with one another form an ………….. .3. …………… itself is one large biome.4. The number of biotic factors in an ecosystem is decided by …………….. .5. Green plants in the living world are …………….. .6. Organisms that depend directly on autotrophs are known as …………. or ……….… .7. Detritivores feed upon …………. of living things.8. Each level in a food chain is called a …………….. .
Answer» Fill in the blanks. 1. Living things in the environment are ……………. factors. 2. Biotic factors, abiotic factors and their interactions with one another form an ………….. . 3. …………… itself is one large biome. 4. The number of biotic factors in an ecosystem is decided by …………….. . 5. Green plants in the living world are …………….. . 6. Organisms that depend directly on autotrophs are known as …………. or ……….… . 7. Detritivores feed upon …………. of living things. 8. Each level in a food chain is called a …………….. .

3409.

Fill in the blanks.1. Living things in the environment are ……………. factors.2. Biotic factors, abiotic factors and their interactions with one another form an ………….. .3. …………… itself is one large biome.4. The number of biotic factors in an ecosystem is decided by …………….. .5. Green plants in the living world are …………….. .6. Organisms that depend directly on autotrophs are known as …………. or ……….… .7. Detritivores feed upon …………. of living things.8. Each level in a food chain is called a …………….. .

Answer»

Fill in the blanks.

1. Living things in the environment are ……………. factors.

2. Biotic factors, abiotic factors and their interactions with one another form an ………….. .

3. …………… itself is one large biome.

4. The number of biotic factors in an ecosystem is decided by …………….. .

5. Green plants in the living world are …………….. .

6. Organisms that depend directly on autotrophs are known as …………. or ……….… .

7. Detritivores feed upon …………. of living things.

8. Each level in a food chain is called a …………….. .

Discussion

3410.	If a body is moving with same velocity through out the the way in One Direction it is balanced or unbalanced
Answer» If a body is moving with same velocity through out the the way in One Direction it is balanced or unbalanced

Discussion

3411.	A steel block of mass 10 kg rests on a horizontal floor as shown in the figure (a). When three iron cylinders are placed on it as shown in the figure (b), the block and cylinders go down with an acceleration 0.2 m/s2. The normal reaction R exerted by the floor, if masses of the iron cylinders are 20 kg each, is -
Answer» A steel block of mass $10 kg$ rests on a horizontal floor as shown in the figure $(a)$ . When three iron cylinders are placed on it as shown in the figure $(b)$ , the block and cylinders go down with an acceleration $0.2 {m/s}^{2}$ . The normal reaction $R$ exerted by the floor, if masses of the iron cylinders are $20 kg$ each, is -

Discussion

3412.	The dimensions of solar constant (energy falling Earth per second per unit area ) are
Answer» The dimensions of solar constant (energy falling Earth per second per unit area ) are

Discussion

3413.	A particle is projected upwards with an initial velocity of 55 m/s the distance travelled by it in its 6th second of its motion
Answer» A particle is projected upwards with an initial velocity of 55 m/s the distance travelled by it in its 6th second of its motion

Discussion

3414.	From the top of a tower of h= 40m a ball is projected up with speed 20m/s at an elevation of 30°. The ratio of the total time taken by the ball to hit the ground to its time taken to come back at same level is (g=10m/s)
Answer» From the top of a tower of h= 40m a ball is projected up with speed 20m/s at an elevation of 30°. The ratio of the total time taken by the ball to hit the ground to its time taken to come back at same level is (g=10m/s)

Discussion

3415.	Question 68(iv)The following graph shows the change in temperature of a block of ice when heated. Use the graph to answer the following questions.What was the temperature after 25 s?
Answer» Question 68(iv) The following graph shows the change in temperature of a block of ice when heated. Use the graph to answer the following questions. What was the temperature after 25 s?

Discussion

3416.	9.Three rods each of mass m and length l are joined to form an equilateral triangle . What is the moment of inertia about an axis passing through the centre of mass of the system and perpendicular to plane?
Answer» 9.Three rods each of mass m and length l are joined to form an equilateral triangle . What is the moment of inertia about an axis passing through the centre of mass of the system and perpendicular to plane?

Discussion

3417.	Why astronauts on the moon cannot hear each other directly?
Answer» Why astronauts on the moon cannot hear each other directly?

Discussion

3418.	A cricket ball is seen to hit the bat first and the sound of hitting is heard a little later. Why ?
Answer» A cricket ball is seen to hit the bat first and the sound of hitting is heard a little later. Why ?

Discussion

3419.	current flowing in two coaxial coils in the same direction.On increasing distance between the two, the i will
Answer» current flowing in two coaxial coils in the same direction.On increasing distance between the two, the i will

Discussion

3420.	A bullet of mass 10 kg moving with a velocity of 400 m per second gets embedded in a freely suspended wooden block of mass 900 grams. what is the velocity acquired by the block?
Answer» A bullet of mass 10 kg moving with a velocity of 400 m per second gets embedded in a freely suspended wooden block of mass 900 grams. what is the velocity acquired by the block?

Discussion

3421.	Which has more inertia : a man or a child ?
Answer» Which has more inertia : a man or a child ?

Discussion

3422.	How can the motion of a freely falling body be an example for uniformly accelerated motion?
Answer» How can the motion of a freely falling body be an example for uniformly accelerated motion?

Discussion

3423.	A body moves with a uniform acceleration of 3 m/s2.After 10 seconds, it's velocity becomes 50m/s.Find the initial velocity of the object. Give answer quickly. Please.
Answer» A body moves with a uniform acceleration of 3 m/s2.After 10 seconds, it's velocity becomes 50m/s.Find the initial velocity of the object. Give answer quickly. Please.

3423.

A body moves with a uniform acceleration of 3 m/s2.After 10 seconds, it's velocity becomes 50m/s.Find the initial velocity of the object. Give answer quickly. Please.

Answer»

A body moves with a uniform acceleration of 3 m/s2.After 10 seconds, it's velocity becomes 50m/s.Find the initial velocity of the object.

Give answer quickly. Please.

Discussion

3424.	While an athlete is running at a constant acceleration of 4.5 m s−2, he exerts a force of 300 N. What is the mass of the athlete?
Answer» While an athlete is running at a constant acceleration of $4.5 m s^{- 2}$ , he exerts a force of $300 N$ . What is the mass of the athlete?

Discussion

3425.	What is the derived unit for electrical charge?
Answer» What is the derived unit for electrical charge?

Discussion

3426.	109.If momentum, time and energy are fundamental quantities then rate of mass is expressed as ?
Answer» 109.If momentum, time and energy are fundamental quantities then rate of mass is expressed as ?

Discussion

3427.	Study the figure and answer the following questionsa. What type of telescope is shown in the figure?b. Label the main parts of the telescope.c. Which type of mirror does the telescope use?d. What other type of telescope uses a curved mirror?e. Explain the working of the above telescope.
Answer» Study the figure and answer the following questions a. What type of telescope is shown in the figure? b. Label the main parts of the telescope. c. Which type of mirror does the telescope use? d. What other type of telescope uses a curved mirror? e. Explain the working of the above telescope.

Discussion

3428.	When is a vernier callipers said to be free from zero error ?
Answer» When is a vernier callipers said to be free from zero error ?

Discussion

3429.	The time periods and the mean radii of the orbits of two planets around Sun are T1,T2 and r1,r2 respectively. The ratio T1T2 is equal to .
Answer» The time periods and the mean radii of the orbits of two planets around Sun are $T_{1}, T_{2} a n d r_{1}, r_{2}$ respectively. The ratio $\frac{T_{1}}{T_{2}}$ is equal to .

Discussion

3430.	64.The postion of a moving particle ina straight line is given by x=t2-4t+2 where x in meter and in second. Total distance travelled by the particles between t=0 to t=3 second will be
Answer» 64.The postion of a moving particle ina straight line is given by x=t2-4t+2 where x in meter and in second. Total distance travelled by the particles between t=0 to t=3 second will be

Discussion

3431.	Why liquids exert an upward buoyant force?
Answer» Why liquids exert an upward buoyant force?

Discussion

3432.	Observe the picture and guess the component that gives us instant energy.
Answer» Observe the picture and guess the component that gives us instant energy.

Discussion

3433.	A machine gun fires n bullets per second each of mass m. If the speed of each bullet is v, then the force of recoil is?
Answer» A machine gun fires n bullets per second each of mass m. If the speed of each bullet is v, then the force of recoil is?

Discussion

3434.	The intensity of radiation emitted by the sun has its maximum value at a wavelength of 510 nm and that emitted by the North Star has the maximum value at 350 nm. If these stars behave like blackbodies, then the ratio of the surface temperatures of the sun and North Star is
Answer» The intensity of radiation emitted by the sun has its maximum value at a wavelength of $510 nm$ and that emitted by the North Star has the maximum value at $350 nm$ . If these stars behave like blackbodies, then the ratio of the surface temperatures of the sun and North Star is

Discussion

3435.	State the law of conservation of momentum
Answer» State the law of conservation of momentum

Discussion

3436.	A machine gun fires n bullets per second with speed u , and mass of each bullet is m . If bullets hit a wall and rebounds with same speed , then force acting on wall is
Answer» A machine gun fires n bullets per second with speed u , and mass of each bullet is m . If bullets hit a wall and rebounds with same speed , then force acting on wall is

Discussion

3437.	what is the orbital angular momentum of electron of 5dz^2 orbital?
Answer» what is the orbital angular momentum of electron of 5dz^2 orbital?

Discussion

3438.	The reading of a spring balance when a block is suspended from it in air is 60N. The reading changed to 40N when the block was submerged in water. The specific gravity oc the block is
Answer» The reading of a spring balance when a block is suspended from it in air is 60N. The reading changed to 40N when the block was submerged in water. The specific gravity oc the block is

Discussion

3439.	What is the formula to find bouancy
Answer» What is the formula to find bouancy

Discussion

3440.	t=( x2-1)1/2 Find acceleration in terms of x or distance
Answer» t=( x2-1)1/2 Find acceleration in terms of x or distance

Discussion

3441.	Name the factor on which inertia of a body depends and state how does it depend on the factor stated by you.
Answer» Name the factor on which inertia of a body depends and state how does it depend on the factor stated by you.

Discussion

3442.	A copper cube of mass 1 kg slides down on a rough inclined plane of inclination 37∘ at a constant speed. Assume that any loss in mechanical energy goes into the copper block as thermal energy. Find the increases in the temperature of the block as it slides down through 60 cm. Specific heat capacity of copper Cc= 420 J kg−1K−1. Take sin37∘ = 35
Answer» A copper cube of mass $1 k g$ slides down on a rough inclined plane of inclination $37^{\circ}$ at a constant speed. Assume that any loss in mechanical energy goes into the copper block as thermal energy. Find the increases in the temperature of the block as it slides down through $60 c m$ . Specific heat capacity of copper $C_{c}$ = $420 J k g^{- 1} K^{- 1}$ . Take $s i n 37^{\circ}$ = $\frac{3}{5}$

Discussion

3443.	If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is :1:ut2:1\2gt23:ut-1\2gt^24:(u+gt)t
Answer» If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is : 1:ut 2:1\2gt2 3:ut-1\2gt^2 4:(u+gt)t

Discussion

3444.	Which among the following is correct, where I = current, V = Potential difference & R = Resistance?
Answer» Which among the following is correct, where I = current, V = Potential difference & R = Resistance?

Discussion

3445.	A wave passes from one medium to another medium. Mention one property of the wave, out of speed, frequency or wavelength (a) which changes, (b) which does not change.
Answer» A wave passes from one medium to another medium. Mention one property of the wave, out of speed, frequency or wavelength (a) which changes, (b) which does not change.

3445.

A wave passes from one medium to another medium. Mention one property of the wave, out of speed, frequency or wavelength (a) which changes, (b) which does not change.

Answer»

A wave passes from one medium to another medium. Mention one property of the wave, out of speed, frequency or wavelength

(a) which changes,

(b) which does not change.

Discussion

3446.	A block of iron sinks in water, but floats in mercury, this is because:
Answer» A block of iron sinks in water, but floats in mercury, this is because:

Discussion

3447.	WHAT IS DIFFERENCE BETWEEN HEAT AND TEMPERATURE ?
Answer» WHAT IS DIFFERENCE BETWEEN HEAT AND TEMPERATURE ?

Discussion

3448.	A uniform rope so lies on a table that part of it lays over. The rope begins to slide when the lenght of hanging part is 25% of entire length. The co-efficient of friction between rope and table is
Answer» A uniform rope so lies on a table that part of it lays over. The rope begins to slide when the lenght of hanging part is 25% of entire length. The co-efficient of friction between rope and table is

Discussion

3449.	Mixture of butane, ethane and propane is called :-
Answer» Mixture of butane, ethane and propane is called :-

Discussion

3450.	Question 84(i) The two graph below compares car A and car B. The left graph shows the relationship between age and value. The right graph shows the relationship between size and maximum speed.Use the graph to determine whether each statement is true or false and explain your answer.The older car is less valuable.
Answer» Question 84(i) The two graph below compares car A and car B. The left graph shows the relationship between age and value. The right graph shows the relationship between size and maximum speed. Use the graph to determine whether each statement is true or false and explain your answer. The older car is less valuable.

Discussion

Explore topic-wise InterviewSolutions in .

Find the momentum of a body of mass 100 g having a kinetic energy of 20 J.

Draw the ray diagram. [2 Mark]

Question 07 Angle of incidence is equal to the angle of reflection.a. Alwaysb. Sometimesc. Under special circumstancesd. Never

What is the difference between a low pitched and high pitched sound?

The front and rear end of a train crosses a pole with the speed "u" and "v" respectively. Find the speed with which the mid point of the train crosses the pole?

A beaker containing water is placed on the platform of a spring balance. The platform-balance reads 1.5 kg. A stone of mass 0.5 kg and density 104 kg/m3 is immersed in water without touching the walls of the beaker. What will the platform-balance read now?

The periodic time of a simple pendulum is proportional to

Who firstly discovered proton ? E.goldstein or rutherford and how?

If a body is moving with same velocity through out the the way in One Direction it is balanced or unbalanced

The dimensions of solar constant (energy falling Earth per second per unit area ) are

A particle is projected upwards with an initial velocity of 55 m/s the distance travelled by it in its 6th second of its motion

From the top of a tower of h= 40m a ball is projected up with speed 20m/s at an elevation of 30°. The ratio of the total time taken by the ball to hit the ground to its time taken to come back at same level is (g=10m/s)

Question 68(iv)The following graph shows the change in temperature of a block of ice when heated. Use the graph to answer the following questions.What was the temperature after 25 s?

9.Three rods each of mass m and length l are joined to form an equilateral triangle . What is the moment of inertia about an axis passing through the centre of mass of the system and perpendicular to plane?

Why astronauts on the moon cannot hear each other directly?

A cricket ball is seen to hit the bat first and the sound of hitting is heard a little later. Why ?

current flowing in two coaxial coils in the same direction.On increasing distance between the two, the i will

A bullet of mass 10 kg moving with a velocity of 400 m per second gets embedded in a freely suspended wooden block of mass 900 grams. what is the velocity acquired by the block?

Which has more inertia : a man or a child ?

How can the motion of a freely falling body be an example for uniformly accelerated motion?

A body moves with a uniform acceleration of 3 m/s2.After 10 seconds, it's velocity becomes 50m/s.Find the initial velocity of the object. Give answer quickly. Please.

While an athlete is running at a constant acceleration of 4.5 m s−2, he exerts a force of 300 N. What is the mass of the athlete?

What is the derived unit for electrical charge?

109.If momentum, time and energy are fundamental quantities then rate of mass is expressed as ?

Study the figure and answer the following questionsa. What type of telescope is shown in the figure?b. Label the main parts of the telescope.c. Which type of mirror does the telescope use?d. What other type of telescope uses a curved mirror?e. Explain the working of the above telescope.

When is a vernier callipers said to be free from zero error ?

The time periods and the mean radii of the orbits of two planets around Sun are T1,T2 and r1,r2 respectively. The ratio T1T2 is equal to .

64.The postion of a moving particle ina straight line is given by x=t2-4t+2 where x in meter and in second. Total distance travelled by the particles between t=0 to t=3 second will be

Why liquids exert an upward buoyant force?

Observe the picture and guess the component that gives us instant energy.

A machine gun fires n bullets per second each of mass m. If the speed of each bullet is v, then the force of recoil is?

The intensity of radiation emitted by the sun has its maximum value at a wavelength of 510 nm and that emitted by the North Star has the maximum value at 350 nm. If these stars behave like blackbodies, then the ratio of the surface temperatures of the sun and North Star is

State the law of conservation of momentum

A machine gun fires n bullets per second with speed u , and mass of each bullet is m . If bullets hit a wall and rebounds with same speed , then force acting on wall is

what is the orbital angular momentum of electron of 5dz^2 orbital?

The reading of a spring balance when a block is suspended from it in air is 60N. The reading changed to 40N when the block was submerged in water. The specific gravity oc the block is

What is the formula to find bouancy

t=( x2-1)1/2 Find acceleration in terms of x or distance

Name the factor on which inertia of a body depends and state how does it depend on the factor stated by you.

If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is :1:ut2:1\2gt23:ut-1\2gt^24:(u+gt)t

Which among the following is correct, where I = current, V = Potential difference &amp; R = Resistance?

A wave passes from one medium to another medium. Mention one property of the wave, out of speed, frequency or wavelength (a) which changes, (b) which does not change.

A block of iron sinks in water, but floats in mercury, this is because:

WHAT IS DIFFERENCE BETWEEN HEAT AND TEMPERATURE ?

A uniform rope so lies on a table that part of it lays over. The rope begins to slide when the lenght of hanging part is 25% of entire length. The co-efficient of friction between rope and table is

Mixture of butane, ethane and propane is called :-

Which among the following is correct, where I = current, V = Potential difference & R = Resistance?