13232 + Interview Questions in Physics Page 51 InterviewSolution

2501.	Question 11 Which of the above two graphs (a) and (b) representing the human voice is likely to be the male voice? Give reason for your answer.
Answer» Question 11 Which of the above two graphs (a) and (b) representing the human voice is likely to be the male voice? Give reason for your answer.

Discussion

2502.	Two bodies of mass 3 kg and 4 kg are suspended at the ends of massless string passing over a frictionless pulley. The acceleration of the system is (g=9.8 m/s2)
Answer» Two bodies of mass 3 kg and 4 kg are suspended at the ends of massless string passing over a frictionless pulley. The acceleration of the system is (g=9.8 $m / s^{2}$ )

Discussion

2503.	If a vibrator strikes the water 10 times in one second, then the frequency of wave is:
Answer» If a vibrator strikes the water 10 times in one second, then the frequency of wave is:

Discussion

2504.	18. Identical charges +q are placed at thecorners of a regular hexagon. The chargethat must be placed at the centre of thehexagon to make the whole system ofcharges in equilibrium is:(A) 5q (B) -5q (C) -1.83q (D) Q.19. Two point charges are located on the axisas follows: charge q18 x 109 C is at x=0 and q,--1 × 10-9 C is at x = 1 cm.What is the net force on the charge q3 2 x10-9 C placed at x-2 cm.(A)+5.4 x 10-4 N along -ve x-direction(B) 2.0 × 10-4 N along +ve x-direction8 x 104 N along+ve x-direction× 10-8 N along+ve x-direction.(C)1.(D) 1.8
Answer» 18. Identical charges +q are placed at thecorners of a regular hexagon. The chargethat must be placed at the centre of thehexagon to make the whole system ofcharges in equilibrium is:(A) 5q (B) -5q (C) -1.83q (D) Q.19. Two point charges are located on the axisas follows: charge q18 x 109 C is at x=0 and q,--1 × 10-9 C is at x = 1 cm.What is the net force on the charge q3 2 x10-9 C placed at x-2 cm.(A)+5.4 x 10-4 N along -ve x-direction(B) 2.0 × 10-4 N along +ve x-direction8 x 104 N along+ve x-direction× 10-8 N along+ve x-direction.(C)1.(D) 1.8

Discussion

2505.	22. A charged particle moving without acceleration produces an electricas well as a magnetic field.why?
Answer» 22. A charged particle moving without acceleration produces an electricas well as a magnetic field.why?

Discussion

2506.	In a resonance column tube,1st and 2nd resonances are 24cm and72.6cm.The radius of tube is(velocity of sound =330m/s)
Answer» In a resonance column tube,1st and 2nd resonances are 24cm and72.6cm.The radius of tube is(velocity of sound =330m/s)

Discussion

2507.	Shown below is a semi-infinite wire carrying current I. What will be magnetic field at point P, which is d units away from one of its end?
Answer» Shown below is a semi-infinite wire carrying current I. What will be magnetic field at point P, which is d units away from one of its end?

Discussion

2508.	Write down the weight of a 50 kg mass on the earth. (g=9.8m/s2).
Answer» Write down the weight of a 50 kg mass on the earth. $(g = 9.8 m / s^{2})$ .

Discussion

2509.	If the change in value of acceleration due to gravity at a height h above the surface of the earth is same as at a depth x below it, then (Assume, x and h being much smaller than the radius of the Earth)
Answer» If the change in value of acceleration due to gravity at a height $h$ above the surface of the earth is same as at a depth $x$ below it, then (Assume, $x$ and $h$ being much smaller than the radius of the Earth)

Discussion

2510.	A man standing in front of a vertical cliff fires a gun and hears the echo after 4 seconds. He moves 150 m towards the cliff and again fires the gun. This time, he hears the echo after 3.6 seconds. Find the distance of the cliff from his first position.
Answer» A man standing in front of a vertical cliff fires a gun and hears the echo after $4$ seconds. He moves $150 m$ towards the cliff and again fires the gun. This time, he hears the echo after $3.6$ seconds. Find the distance of the cliff from his first position.

Discussion

2511.	What happens to the force acting on current carrying conductor placed in a magnetic field when : A) Current in conductor increases B) length of conductor increases C) Direction of the current and magnetic field arereversed D) Direction of the current is reversed without changing the direction of magnetic field.
Answer» What happens to the force acting on current carrying conductor placed in a magnetic field when : A) Current in conductor increases B) length of conductor increases C) Direction of the current and magnetic field arereversed D) Direction of the current is reversed without changing the direction of magnetic field.

Discussion

2512.	Differentiate between Kilowatt and Kilowatt hour.
Answer» Differentiate between Kilowatt and Kilowatt hour.

Discussion

2513.	56. A particle moves due north at 3 km/h, another particle B due West at 4 km/h the relative velocity of A with respect to B is (1)5 kilometre/hr, 37 degree north of East (2) 5 km/h, 37 degree north of West
Answer» 56. A particle moves due north at 3 km/h, another particle B due West at 4 km/h the relative velocity of A with respect to B is (1)5 kilometre/hr, 37 degree north of East (2) 5 km/h, 37 degree north of West

Discussion

2514.	A heavy nucleus X of mass number 240 and binding energy per nucleon 7.6 MeV is split into two fragments Y and Z of mass numbers 110 and 130. The binding energy of nucleons in Y and Z is 8.5 MeV per nucleon. Calculat the energy qQ released per fission in MeV
Answer» A heavy nucleus X of mass number 240 and binding energy per nucleon 7.6 MeV is split into two fragments Y and Z of mass numbers 110 and 130. The binding energy of nucleons in Y and Z is 8.5 MeV per nucleon. Calculat the energy qQ released per fission in MeV

Discussion

2515.	If a bus travelling at 20 m/s is subjected to a steady deceleration of 5 m/s2, how long will it take to come to rest ?
Answer» If a bus travelling at $20 m / s$ is subjected to a steady deceleration of $5 m / s^{2}$ , how long will it take to come to rest ?

Discussion

2516.	The wheels of a moving car are in:
Answer» The wheels of a moving car are in:

Discussion

2517.	Power and energy are scalar quantity or vector quantity?
Answer» Power and energy are scalar quantity or vector quantity?

Discussion

2518.	Question 14 An electric heater is rated 1500 W. How much energy does it use in 10 hours?
Answer» Question 14 An electric heater is rated 1500 W. How much energy does it use in 10 hours?

Discussion

2519.	How much water should be added to fill 3/4 th of the jar if half of jar is already filled?
Answer» How much water should be added to fill 3/4 th of the jar if half of jar is already filled?

Discussion

2520.	Which of the following is/are the example of Newton's Third Law of Motion?
Answer» Which of the following is/are the example of Newton's Third Law of Motion?

Discussion

2521.	if earth is exacting some force on the ball come down towards the earth why not earth goes to the ball ,as ball is also exacting same force to earth
Answer» if earth is exacting some force on the ball come down towards the earth why not earth goes to the ball ,as ball is also exacting same force to earth

Discussion

2522.	The resistance of a wire, of length 'l', is RΩ. The wire is stretched to double its length keeping the volume constant. The resistance of the wire will become?
Answer» The resistance of a wire, of length 'l', is RΩ. The wire is stretched to double its length keeping the volume constant. The resistance of the wire will become?

Discussion

2523.	Two rods each of length L2 and coefficient of linear expansion α2 each are connected freely to a third rod of length L1 and coefficient of expansion α1 to form an isosceles triangle. The arrangement is supported on a knife-edge at the midpoint of L1 which is horizontal. What relation must exist between L1 and L2 so that the apex of the isosceles triangle is to remain at a constant height from the knife edge as the temperature changes.
Answer» Two rods each of length $L_{2}$ and coefficient of linear expansion $α_{2}$ each are connected freely to a third rod of length $L_{1}$ and coefficient of expansion $α_{1}$ to form an isosceles triangle. The arrangement is supported on a knife-edge at the midpoint of $L_{1}$ which is horizontal. What relation must exist between $L_{1}$ and $L_{2}$ so that the apex of the isosceles triangle is to remain at a constant height from the knife edge as the temperature changes.

Discussion

2524.	Railway tracks are banked at the curves so that the necessary centripetal force may be obtained from the horizontal component of the reaction on the train.
Answer» Railway tracks are banked at the curves so that the necessary centripetal force may be obtained from the horizontal component of the reaction on the train.

Discussion

2525.	Question 2An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.
Answer» Question 2 An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.

Discussion

2526.	29. Find current across branch CD
Answer» 29. Find current across branch CD

Discussion

2527.	a body is acted upon by balanced forces 1).if it is in rest only 2). if it is moving with cons†an t speed 3). if it is not accelerating. why option (2). is incorrect
Answer» a body is acted upon by balanced forces 1).if it is in rest only 2). if it is moving with cons†an t speed 3). if it is not accelerating. why option (2). is incorrect

Discussion

2528.	A particle is projected horizontally with a speed u from the top of a plane inclined at an angle thita with the horizontal. How far from the point of projection will the particle strike the plane?
Answer» A particle is projected horizontally with a speed u from the top of a plane inclined at an angle thita with the horizontal. How far from the point of projection will the particle strike the plane?

Discussion

2529.	State whether the statements are True or False. Question 27A line graph can also be a whole unbroken line.
Answer» State whether the statements are True or False. Question 27 A line graph can also be a whole unbroken line.

Discussion

2530.	A metal wire of length L, area of cross-section A and Young’s modulus Y behaves as a spring of spring constant K. Which of the following is correct?
Answer» A metal wire of length $L$ , area of cross-section $A$ and Young’s modulus $Y$ behaves as a spring of spring constant $K$ . Which of the following is correct?

Discussion

2531.	35 Consider the following ionization energy data of anelement XIE1 = 737.7 kJ/molIE2=1450.7 kJ/molIE3 = 7732.7 kJ/molIEs =10542.5 kJ/molIEs= 13630.0 kJ/molThe most probable electronic configuration ofoutermost orbit of element X is(1) ns1(2) As2np1(3) ns aps
Answer» 35 Consider the following ionization energy data of anelement XIE1 = 737.7 kJ/molIE2=1450.7 kJ/molIE3 = 7732.7 kJ/molIEs =10542.5 kJ/molIEs= 13630.0 kJ/molThe most probable electronic configuration ofoutermost orbit of element X is(1) ns1(2) As2np1(3) ns aps

Discussion

2532.	A train is moving with uniform acceleration. The two ends of the train pass through a point on the railway track with velocity v1 and v2. With what velocity the middle point of the train would pass through the same point.?
Answer» A train is moving with uniform acceleration. The two ends of the train pass through a point on the railway track with velocity v1 and v2. With what velocity the middle point of the train would pass through the same point.?

Discussion

2533.	Question 25 What is power? How do you differentiate kilowatt from kilowatt hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of water falls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g=10ms−2)
Answer» Question 25 What is power? How do you differentiate kilowatt from kilowatt hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of water falls from it in a minute. Calculate the equivalent power if all this energy can be utilized? ( $g = 10 m s^{- 2}$ )

Discussion

2534.	How to derive the formula for the moment of inertia of a semi circle?
Answer» How to derive the formula for the moment of inertia of a semi circle?

Discussion

2535.	The velocity of a planet revolving around the sun at three different times of a year are shown in the figure.Which among the following alternatives is correct ?
Answer» The velocity of a planet revolving around the sun at three different times of a year are shown in the figure. Which among the following alternatives is correct ?

Discussion

2536.	Why rain clouds are dark in colour?
Answer» Why rain clouds are dark in colour?

Discussion

2537.	If speed (V), acceleration (A) and force (F) are considered as fundamental units, the dimension of Young's modulus will be :
Answer» If speed $(V)$ , acceleration $(A)$ and force $(F)$ are considered as fundamental units, the dimension of Young's modulus will be :

Discussion

2538.	A carnot refrigertor freezes 5 kg of water at 0^° C into ice at 0^° C in a time interval of 20 min.Assuming room temperature as20^° C. calculate the minimum power needed to accomplish it
Answer» A carnot refrigertor freezes 5 kg of water at 0^° C into ice at 0^° C in a time interval of 20 min.Assuming room temperature as20^° C. calculate the minimum power needed to accomplish it

Discussion

2539.	The thimble of a screw gauge has 50 divisions. The spindle advances 1 mm when the screw is turned through two revolutions. What is the least count of screw gauge?
Answer» The thimble of a screw gauge has 50 divisions. The spindle advances 1 mm when the screw is turned through two revolutions. What is the least count of screw gauge?

Discussion

2540.	State the condition under which the body sinks, when it is immersed inside the liquid. Consider ρ to be the density of the block and ρL to be the density of the liquid.
Answer» State the condition under which the body sinks, when it is immersed inside the liquid. Consider ρ to be the density of the block and $ρ_{L}$ to be the density of the liquid.

2540.

State the condition under which the body sinks, when it is immersed inside the liquid. Consider ρ to be the density of the block and ρL to be the density of the liquid.

Answer»

State the condition under which the body sinks, when it is immersed inside the liquid. Consider ρ to be the density of the block and $ρ_{L}$ to be the density of the liquid.

Discussion

2541.	The intial veocity of a particle moving aiong x axisis u (at tx and 0 and ts acceleration a isgiven by a s ka Whicth of the tollowing equation iscomect betaee its veloclly (v) and posuition (x)?
Answer» The intial veocity of a particle moving aiong x axisis u (at tx and 0 and ts acceleration a isgiven by a s ka Whicth of the tollowing equation iscomect betaee its veloclly (v) and posuition (x)?

Discussion

2542.	Neil Armstrong and Buzz Aldrin landed on the moon in 1969. There, Neil and Buzz decided to calculate the time taken by things to reach the ground. So Neil dropped a ball from height 7.35 m from the surface of the moon and Buzz was supposed to record the time taken. How much time did it take for the ball to touch the surface?
Answer» Neil Armstrong and Buzz Aldrin landed on the moon in 1969. There, Neil and Buzz decided to calculate the time taken by things to reach the ground. So Neil dropped a ball from height 7.35 m from the surface of the moon and Buzz was supposed to record the time taken. How much time did it take for the ball to touch the surface?

Discussion

2543.	What is the potenitalenergy of a book of mass 200g kept on a table of height 1 m
Answer» What is the potenitalenergy of a book of mass 200g kept on a table of height 1 m

Discussion

2544.	Question 32 Fill in the missing data in the Table 3.1 Species propertyH2OCO2Na−atomMgCl2Number of moles2−−0.5Number of particles−3.011×1023−−Mass36 g−115 g−
Answer» Question 32 Fill in the missing data in the Table 3.1 $\begin{matrix} S p e c i e s p r o p e r t y & H_{2} O & C O_{2} & N a - a t o m & M g C l_{2} N u m b e r o f m o l e s & 2 & - & - & 0.5 N u m b e r o f p a r t i c l e s & - & 3.011 \times 10^{23} & - & - M a s s & 36 g & - & 115 g & - \end{matrix}$

Discussion

2545.	State whether the distance is a scalar or a vector quantity.
Answer» State whether the distance is a scalar or a vector quantity.

Discussion

2546.	1. A wire can bear a maximum wt of 20 kg . If wire is divided into two equal parts then each part can support a maximum how much weight?
Answer» 1. A wire can bear a maximum wt of 20 kg . If wire is divided into two equal parts then each part can support a maximum how much weight?

Discussion

2547.	Identify the polar radius of the earth from the following.
Answer» Identify the polar radius of the earth from the following.

Discussion

2548.	A particle moving with a uniform acceleration along a straight line covers distances a and b in successiveintervals of p and q second. The acceleration of the particle is:
Answer» A particle moving with a uniform acceleration along a straight line covers distances a and b in successive intervals of p and q second. The acceleration of the particle is:

Discussion

2549.	17.A car travels equal distances in the same direction with velocities 60kmph,20kmph, and 10kmph respectively. The average velocity of the car over the whole journey
Answer» 17.A car travels equal distances in the same direction with velocities 60kmph,20kmph, and 10kmph respectively. The average velocity of the car over the whole journey

Discussion

2550.	Two satellites of equal mass A and B are revolvingaround earth in circular orbits of radii r and 4rrespectively. Ratio of angular momentum of A and B in their orbit about earth is 1. 1/2 2. 1/ \sqrt2 3. 2 4. \sqrt{2
Answer» Two satellites of equal mass A and B are revolvingaround earth in circular orbits of radii r and 4rrespectively. Ratio of angular momentum of A and B in their orbit about earth is 1. 1/2 2. 1/ \sqrt2 3. 2 4. \sqrt{2

Discussion

Explore topic-wise InterviewSolutions in .

Question 11 Which of the above two graphs (a) and (b) representing the human voice is likely to be the male voice? Give reason for your answer.

Two bodies of mass 3 kg and 4 kg are suspended at the ends of massless string passing over a frictionless pulley. The acceleration of the system is (g=9.8 m/s2)

If a vibrator strikes the water 10 times in one second, then the frequency of wave is:

22. A charged particle moving without acceleration produces an electricas well as a magnetic field.why?

In a resonance column tube,1st and 2nd resonances are 24cm and72.6cm.The radius of tube is(velocity of sound =330m/s)

Shown below is a semi-infinite wire carrying current I. What will be magnetic field at point P, which is d units away from one of its end?

Write down the weight of a 50 kg mass on the earth. (g=9.8m/s2).

If the change in value of acceleration due to gravity at a height h above the surface of the earth is same as at a depth x below it, then (Assume, x and h being much smaller than the radius of the Earth)

A man standing in front of a vertical cliff fires a gun and hears the echo after 4 seconds. He moves 150 m towards the cliff and again fires the gun. This time, he hears the echo after 3.6 seconds. Find the distance of the cliff from his first position.

Differentiate between Kilowatt and Kilowatt hour.

56. A particle moves due north at 3 km/h, another particle B due West at 4 km/h the relative velocity of A with respect to B is (1)5 kilometre/hr, 37 degree north of East (2) 5 km/h, 37 degree north of West

A heavy nucleus X of mass number 240 and binding energy per nucleon 7.6 MeV is split into two fragments Y and Z of mass numbers 110 and 130. The binding energy of nucleons in Y and Z is 8.5 MeV per nucleon. Calculat the energy qQ released per fission in MeV

If a bus travelling at 20 m/s is subjected to a steady deceleration of 5 m/s2, how long will it take to come to rest ?

The wheels of a moving car are in:

Power and energy are scalar quantity or vector quantity?

Question 14 An electric heater is rated 1500 W. How much energy does it use in 10 hours?

How much water should be added to fill 3/4 th of the jar if half of jar is already filled?

Which of the following is/are the example of Newton's Third Law of Motion?

if earth is exacting some force on the ball come down towards the earth why not earth goes to the ball ,as ball is also exacting same force to earth

The resistance of a wire, of length 'l', is RΩ. The wire is stretched to double its length keeping the volume constant. The resistance of the wire will become?

Railway tracks are banked at the curves so that the necessary centripetal force may be obtained from the horizontal component of the reaction on the train.

Question 2An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.

29. Find current across branch CD

a body is acted upon by balanced forces 1).if it is in rest only 2). if it is moving with cons†an t speed 3). if it is not accelerating. why option (2). is incorrect

A particle is projected horizontally with a speed u from the top of a plane inclined at an angle thita with the horizontal. How far from the point of projection will the particle strike the plane?

State whether the statements are True or False. Question 27A line graph can also be a whole unbroken line.

A metal wire of length L, area of cross-section A and Young’s modulus Y behaves as a spring of spring constant K. Which of the following is correct?

35 Consider the following ionization energy data of anelement XIE1 = 737.7 kJ/molIE2=1450.7 kJ/molIE3 = 7732.7 kJ/molIEs =10542.5 kJ/molIEs= 13630.0 kJ/molThe most probable electronic configuration ofoutermost orbit of element X is(1) ns1(2) As2np1(3) ns aps

A train is moving with uniform acceleration. The two ends of the train pass through a point on the railway track with velocity v1 and v2. With what velocity the middle point of the train would pass through the same point.?

Question 25 What is power? How do you differentiate kilowatt from kilowatt hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of water falls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g=10ms−2)

How to derive the formula for the moment of inertia of a semi circle?

The velocity of a planet revolving around the sun at three different times of a year are shown in the figure.Which among the following alternatives is correct ?

Why rain clouds are dark in colour?

If speed (V), acceleration (A) and force (F) are considered as fundamental units, the dimension of Young's modulus will be :

A carnot refrigertor freezes 5 kg of water at 0^° C into ice at 0^° C in a time interval of 20 min.Assuming room temperature as20^° C. calculate the minimum power needed to accomplish it

The thimble of a screw gauge has 50 divisions. The spindle advances 1 mm when the screw is turned through two revolutions. What is the least count of screw gauge?

State the condition under which the body sinks, when it is immersed inside the liquid. Consider ρ to be the density of the block and ρL to be the density of the liquid.

The intial veocity of a particle moving aiong x axisis u (at tx and 0 and ts acceleration a isgiven by a s ka Whicth of the tollowing equation iscomect betaee its veloclly (v) and posuition (x)?

What is the potenitalenergy of a book of mass 200g kept on a table of height 1 m

Question 32 Fill in the missing data in the Table 3.1 Species propertyH2OCO2Na−atomMgCl2Number of moles2−−0.5Number of particles−3.011×1023−−Mass36 g−115 g−

State whether the distance is a scalar or a vector quantity.

1. A wire can bear a maximum wt of 20 kg . If wire is divided into two equal parts then each part can support a maximum how much weight?

Identify the polar radius of the earth from the following.

A particle moving with a uniform acceleration along a straight line covers distances a and b in successiveintervals of p and q second. The acceleration of the particle is:

17.A car travels equal distances in the same direction with velocities 60kmph,20kmph, and 10kmph respectively. The average velocity of the car over the whole journey

Two satellites of equal mass A and B are revolvingaround earth in circular orbits of radii r and 4rrespectively. Ratio of angular momentum of A and B in their orbit about earth is 1. 1/2 2. 1/ \sqrt2 3. 2 4. \sqrt{2