13232 + Interview Questions in Physics Page 49 InterviewSolution

2401.	13.Describe the motion of a charged particle in a cyclotron if the frequency of the radio frequency (rf) field were doubled
Answer» 13.Describe the motion of a charged particle in a cyclotron if the frequency of the radio frequency (rf) field were doubled

Discussion

2402.	sound waves of wave lenght X travel from a medium in which velocity is V m/s into another medium in which if velocity is 3m/s is the wavelength of sound lambda in the second medium.
Answer» sound waves of wave lenght X travel from a medium in which velocity is V m/s into another medium in which if velocity is 3m/s is the wavelength of sound lambda in the second medium.

Discussion

2403.	If the dis†an ce between four consecutive compression of a sound wave is 6 cm,then the wavelength of the wave would be ________
Answer» If the dis†an ce between four consecutive compression of a sound wave is 6 cm,then the wavelength of the wave would be ________

Discussion

2404.	if the percent error in the measurement of momentum and mass of an object are 2 percent and 3 percent then maximum percentage error in the calculated value of its kinetic energy i
Answer» if the percent error in the measurement of momentum and mass of an object are 2 percent and 3 percent then maximum percentage error in the calculated value of its kinetic energy i

Discussion

2405.	(a) Draw ray diagrams to illustrate the formation of a virtual image by using (i) a convex lens, and (ii) a concave lens.(b) What is the difference between the two images formed above?
Answer» (a) Draw ray diagrams to illustrate the formation of a virtual image by using (i) a convex lens, and (ii) a concave lens. (b) What is the difference between the two images formed above?

Discussion

2406.	A point object p is placed between two converging mirrors . Find the dist. betweeen two mirrors in terms of f for which only one image is formed by the two mirrors.
Answer» A point object p is placed between two converging mirrors . Find the dist. betweeen two mirrors in terms of f for which only one image is formed by the two mirrors.

Discussion

2407.	Is sun at rest
Answer» Is sun at rest

Discussion

2408.	The ratio of intensities between two coherent sound sources is 4:1. The difference of loudness in decibels between maximum and minimum intensities,when they interfere in space,is a)10 log 2 b)20 log 3 c)10 log 3 d)20 log 2
Answer» The ratio of intensities between two coherent sound sources is 4:1. The difference of loudness in decibels between maximum and minimum intensities,when they interfere in space,is a)10 log 2 b)20 log 3 c)10 log 3 d)20 log 2

Discussion

2409.	The image of a clock in a plane mirror shows a wrong time as 08:45. Assuming the clock did not have number markings on it, the correct time would be:
Answer» The image of a clock in a plane mirror shows a wrong time as 08:45. Assuming the clock did not have number markings on it, the correct time would be:

Discussion

2410.	If the work done on a body at two instances i.e., 20s and 40s is same, then what is the ratio of the power?
Answer» If the work done on a body at two instances i.e., 20s and 40s is same, then what is the ratio of the power?

Discussion

2411.	Work done by a force is negative . Angle between force and displacement is
Answer» Work done by a force is negative . Angle between force and displacement is

Discussion

2412.	Each of the following sentences is false, make them true and rewrite the sentences.1. Heterotrophs in an ecosystem are producers.2. Carnivores in an ecosystem form the second trophic level.3. 100% of energy is passed on from each torphic level to the next one.4. The flow of energy in an ecosystem is cyclic.5. The health of an ecosystem is judged by the flow of nutrients.
Answer» Each of the following sentences is false, make them true and rewrite the sentences. 1. Heterotrophs in an ecosystem are producers. 2. Carnivores in an ecosystem form the second trophic level. 3. 100% of energy is passed on from each torphic level to the next one. 4. The flow of energy in an ecosystem is cyclic. 5. The health of an ecosystem is judged by the flow of nutrients.

2412.

Each of the following sentences is false, make them true and rewrite the sentences.1. Heterotrophs in an ecosystem are producers.2. Carnivores in an ecosystem form the second trophic level.3. 100% of energy is passed on from each torphic level to the next one.4. The flow of energy in an ecosystem is cyclic.5. The health of an ecosystem is judged by the flow of nutrients.

Answer»

Each of the following sentences is false, make them true and rewrite the sentences.

1. Heterotrophs in an ecosystem are producers.

2. Carnivores in an ecosystem form the second trophic level.

3. 100% of energy is passed on from each torphic level to the next one.

4. The flow of energy in an ecosystem is cyclic.

5. The health of an ecosystem is judged by the flow of nutrients.

Discussion

2413.	A stone of weight w is thrown vertically upward into air from the ground level with initial speed Vo. if a constant force f due to air drag act on the stone throughout its flight . what will be the maximum height attained by the stone ?
Answer» A stone of weight w is thrown vertically upward into air from the ground level with initial speed Vo. if a constant force f due to air drag act on the stone throughout its flight . what will be the maximum height attained by the stone ?

Discussion

2414.	There are two balls A and B of mass 1 kg and 2 kg respectively. Ball A is moving with a velocity of 2 m/s and collides with B at rest. After the collision, A comes to rest and B starts moving. Find the velocity of B.
Answer» There are two balls A and B of mass $1 kg$ and $2 kg$ respectively. Ball A is moving with a velocity of $2 m/s$ and collides with B at rest. After the collision, A comes to rest and B starts moving. Find the velocity of B.

Discussion

2415.	250 turn rectangular coil of length 2.1 CM width 1.25 CM carries a current of 85 micro empier and subjected to magnetic field of strength 0.85 Tesla work done for rotating the coil by the 180 against the TOK
Answer» 250 turn rectangular coil of length 2.1 CM width 1.25 CM carries a current of 85 micro empier and subjected to magnetic field of strength 0.85 Tesla work done for rotating the coil by the 180 against the TOK

Discussion

2416.	A closed organ pipe has a fundamental frequency of 1.5 kHz. The number of overtones that can be distinctly heard by a person with this organ pipe will be: (Assume that the highest frequency a person can hear is 20,000 Hz)
Answer» A closed organ pipe has a fundamental frequency of $1.5 kHz$ . The number of overtones that can be distinctly heard by a person with this organ pipe will be: (Assume that the highest frequency a person can hear is $20, 000 Hz$ )

Discussion

2417.	A vehicle is acccelarating on a straight road. Its velocity at an instant is 30km/hr. After 2 sec ,it is 33.6 km/hr and after further 2sec it is 37.2 km/hr. Find the accelaration is m/sec.
Answer» A vehicle is acccelarating on a straight road. Its velocity at an instant is 30km/hr. After 2 sec ,it is 33.6 km/hr and after further 2sec it is 37.2 km/hr. Find the accelaration is m/sec.

Discussion

2418.	The magnetic field existing in a region is given by B=B'(1+x/l)k". A square loop of edge l and carrying a current I; is placed with its edge parallel to the x-y axes. Find the magnitude of the net magnetic force experienced by the loop
Answer» The magnetic field existing in a region is given by B=B'(1+x/l)k". A square loop of edge l and carrying a current I; is placed with its edge parallel to the x-y axes. Find the magnitude of the net magnetic force experienced by the loop

Discussion

2419.	Why is the earth in elliptical shape?
Answer» Why is the earth in elliptical shape?

Discussion

2420.	Four forces, tangent to the radius R, are acting on a wheel as shown in the figure. The resultant equivalent one force system will be,
Answer» Four forces, tangent to the radius $R$ , are acting on a wheel as shown in the figure. The resultant equivalent one force system will be,

Discussion

2421.	How does the acceleration produced by a given force depend on mass of the body? Draw graph to show it.
Answer» How does the acceleration produced by a given force depend on mass of the body? Draw graph to show it.

Discussion

2422.	For the three-dimensional object shown in the figure below, five faces are insulated. The sixth face (PQRS), which is not insulated, interacts thermally with the ambient, with a convective heat transfer coefficient of 10 W/m2K. The ambient temperature is 30∘C. Heat is uniformly generated inside the object at the rate of 100 W/m3. Assuming the face (PQRS) to be at uniform temperature, its steady state temperature is
Answer» For the three-dimensional object shown in the figure below, five faces are insulated. The sixth face $(P Q R S),$ which is not insulated, interacts thermally with the ambient, with a convective heat transfer coefficient of $10 W / m^{2} K .$ The ambient temperature is $30^{\circ} C .$ Heat is uniformly generated inside the object at the rate of $100 W / m^{3} .$ Assuming the face $(P Q R S)$ to be at uniform temperature, its steady state temperature is

Discussion

2423.	Two blocks of mass 1 kg and 2 kg are connected by a massless string and placed on a horizontal smooth surface now and external force is applied on block of mass is 1 kg which creates a tension of 10 Newton in the string then find the value of applied force
Answer» Two blocks of mass 1 kg and 2 kg are connected by a massless string and placed on a horizontal smooth surface now and external force is applied on block of mass is 1 kg which creates a tension of 10 Newton in the string then find the value of applied force

Discussion

2424.	Find the equivalent resistance between A and B.
Answer» Find the equivalent resistance between $A$ and $B$ .

Discussion

2425.	what is gravitational mass? what other types of masses exist?
Answer» what is gravitational mass? what other types of masses exist?

Discussion

2426.	note on newton's laws of motio
Answer» note on newton's laws of motio

Discussion

2427.	During the propagation of electromagnetic waves in a medium??
Answer» During the propagation of electromagnetic waves in a medium??

Discussion

2428.	A radioactive decay can form an isotope of the original nucleus with the emission of particles
Answer» A radioactive decay can form an isotope of the original nucleus with the emission of particles

Discussion

2429.	72. An object start moving from rest on a straight line path with uniform acceleration and covers a distance of 100m in first 10 S. The distance it covers in next 5 s is
Answer» 72. An object start moving from rest on a straight line path with uniform acceleration and covers a distance of 100m in first 10 S. The distance it covers in next 5 s is

Discussion

2430.	If two angles mirror are inclined at 90 degree the final reflected ray ra antiparallel to the incident ray , it is suffers reflection at both the mirrors
Answer» If two angles mirror are inclined at 90 degree the final reflected ray ra antiparallel to the incident ray , it is suffers reflection at both the mirrors

Discussion

2431.	How to find error in screw gauge
Answer» How to find error in screw gauge

Discussion

2432.	The average velocity of a particle moving in a straight line, with constant acceleration, ′a′ and initial velocity, ′u′ in the first ′t′ seconds is:
Answer» The average velocity of a particle moving in a straight line, with constant acceleration, $^{'} a^{'}$ and initial velocity, $^{'} u^{'}$ in the first $^{'} t^{'}$ seconds is:

Discussion

2433.	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

2434.	A spaceship orbits around a planet at a height of 20 km from its surface. Assuming that only gravitational field of the planet acts on the spaceship, what will be the number of complete revolutions made by the spaceship in 24 hours around the planet ?[Given: Mass of planet =8×1022 kg, Radius of planet=2×106 m, Gravitational constant G=6.67×10−11 Nm2/kg2]
Answer» A spaceship orbits around a planet at a height of $20 km$ from its surface. Assuming that only gravitational field of the planet acts on the spaceship, what will be the number of complete revolutions made by the spaceship in $24 hours$ around the planet ? [Given: Mass of planet $= 8 \times 10^{22} kg$ , Radius of planet $= 2 \times 10^{6} m$ , Gravitational constant $G = 6.67 \times 10^{- 11} {Nm}^{2} / {kg}^{2}$ ]

Discussion

2435.	For the given object and mirror arrangement, the velocity (in cm/s) of the image with respect to ground will be[All the velocities are given with respect to ground]
Answer» For the given object and mirror arrangement, the velocity $($ in $cm/s)$ of the image with respect to ground will be $[$ All the velocities are given with respect to ground $]$

Discussion

2436.	A truck moves at 36 kmh−1. It increases its velocity to 90 kmh−1 in 0.1 minute.What is the acceleration of the truck?
Answer» A truck moves at $36 k m h^{- 1}$ . It increases its velocity to $90 k m h^{- 1}$ in $0.1 m i n u t e$ . What is the acceleration of the truck?

2436.

A truck moves at 36 kmh−1. It increases its velocity to 90 kmh−1 in 0.1 minute.What is the acceleration of the truck?

Answer»

A truck moves at $36 k m h^{- 1}$ . It increases its velocity to $90 k m h^{- 1}$ in $0.1 m i n u t e$ .

What is the acceleration of the truck?

Discussion

2437.	25 picometre =_________centimetre
Answer» $25 p i c o m e t r e$ $=$ _________ $c e n t i m e t r e$

Discussion

2438.	The molecular weight of O2, and N2, are 32 and 28respectively. At 15^° C the temperature of 1 g of O2 will be the same as that 1g of N2 in the same bottle at the temperature.(a) -21^° C (b) 56^° C(c)15^° C() 13^° C
Answer» The molecular weight of O2, and N2, are 32 and 28respectively. At 15^° C the temperature of 1 g of O2 will be the same as that 1g of N2 in the same bottle at the temperature.(a) -21^° C (b) 56^° C(c)15^° C() 13^° C

Discussion

2439.	If the radius of earth becomes 2 times its present value, then duration of the day would change to (mass of earth remain cons†an t Options: a- 24 h b- 12 h c-48 h d- 96 h
Answer» If the radius of earth becomes 2 times its present value, then duration of the day would change to (mass of earth remain cons†an t Options: a- 24 h b- 12 h c-48 h d- 96 h

Discussion

2440.	A particle is moving along x – axis the position of the particle at any instant is given by x = a + bt2 where a = 6m and b = 3.5mj2t is measured in s, find(i) velocity of the particle at t = 0s and t =3s (ii) the average velocity between t =3s and t = 6s
Answer» A particle is moving along x – axis the position of the particle at any instant is given by x = a + bt2 where a = 6m and b = 3.5mj2 t is measured in s, find(i) velocity of the particle at t = 0s and t =3s (ii) the average velocity between t =3s and t = 6s

Discussion

2441.	A ball is thrown such that Time of flight =5 sec and range R is 200 m. Find magnitude and direction of initial velocity(direction in †anθ
Answer» A ball is thrown such that Time of flight =5 sec and range R is 200 m. Find magnitude and direction of initial velocity(direction in †anθ

Discussion

2442.	A partially inflated balloon is placed inside a bell jar connected to a vacuum pump. On creating vacuum inside the bell jar, balloon gets more inflated. How does the pressure change : increase, decrease or remains same, inside the (a) bell jar and (b) balloon ?
Answer» A partially inflated balloon is placed inside a bell jar connected to a vacuum pump. On creating vacuum inside the bell jar, balloon gets more inflated. How does the pressure change : increase, decrease or remains same, inside the (a) bell jar and (b) balloon ?

Discussion

2443.	Refrigerator is an example of
Answer» Refrigerator is an example of

Discussion

2444.	A body is moving in a circular path of radius 0.125 m. If the body covers a distance of one quarter of the circumference of the path in √2 s, what is the velocity of the body in that distance, in m min−1?7.5
Answer» A body is moving in a circular path of radius $0.125 m$ . If the body covers a distance of one quarter of the circumference of the path in $\sqrt{2} s$ , what is the velocity of the body in that distance, in ${m min}^{- 1}$ ? 7.5

Discussion

2445.	why the acceleration due to gravity is maximum at poles and minimum at equator ? explain mathematically
Answer» why the acceleration due to gravity is maximum at poles and minimum at equator ? explain mathematically

Discussion

2446.	A body is projected vertically upwards with an initial velocity u. If the acceleration due to gravity is g, find the time wherein it remains in the air.
Answer» A body is projected vertically upwards with an initial velocity $u$ . If the acceleration due to gravity is $g$ , find the time wherein it remains in the air.

Discussion

2447.	Why does a fountain pen leak at a high altitude ?
Answer» Why does a fountain pen leak at a high altitude ?

Discussion

2448.	The loudness of source of sound at a given location increases by 10dB. By how many times does its intensity ?
Answer» The loudness of source of sound at a given location increases by 10dB. By how many times does its intensity ?

Discussion

2449.	a technician has two pipes of length 128m and 272m .find the maximum length of a scale which is used to measure the length of these pipes in integral form.
Answer» a technician has two pipes of length 128m and 272m .find the maximum length of a scale which is used to measure the length of these pipes in integral form.

Discussion

2450.	Three charges +4q, Q and q are placed in a straight line of length l at points O,l2 and l distance away from one end respectively. What should be Q in order to make the net force on q to be zero?
Answer» Three charges +4q, Q and q are placed in a straight line of length l at points O, $\frac{l}{2}$ and l distance away from one end respectively. What should be Q in order to make the net force on q to be zero?

Discussion

Explore topic-wise InterviewSolutions in .

13.Describe the motion of a charged particle in a cyclotron if the frequency of the radio frequency (rf) field were doubled

sound waves of wave lenght X travel from a medium in which velocity is V m/s into another medium in which if velocity is 3m/s is the wavelength of sound lambda in the second medium.

If the dis†an ce between four consecutive compression of a sound wave is 6 cm,then the wavelength of the wave would be ________

if the percent error in the measurement of momentum and mass of an object are 2 percent and 3 percent then maximum percentage error in the calculated value of its kinetic energy i

(a) Draw ray diagrams to illustrate the formation of a virtual image by using (i) a convex lens, and (ii) a concave lens.​(b) What is the difference between the two images formed above?

A point object p is placed between two converging mirrors . Find the dist. betweeen two mirrors in terms of f for which only one image is formed by the two mirrors.

Is sun at rest

The ratio of intensities between two coherent sound sources is 4:1. The difference of loudness in decibels between maximum and minimum intensities,when they interfere in space,is a)10 log 2 b)20 log 3 c)10 log 3 d)20 log 2

The image of a clock in a plane mirror shows a wrong time as 08:45. Assuming the clock did not have number markings on it, the correct time would be:

If the work done on a body at two instances i.e., 20s and 40s is same, then what is the ratio of the power?

Work done by a force is negative . Angle between force and displacement is

A stone of weight w is thrown vertically upward into air from the ground level with initial speed Vo. if a constant force f due to air drag act on the stone throughout its flight . what will be the maximum height attained by the stone ?

There are two balls A and B of mass 1 kg and 2 kg respectively. Ball A is moving with a velocity of 2 m/s and collides with B at rest. After the collision, A comes to rest and B starts moving. Find the velocity of B.

250 turn rectangular coil of length 2.1 CM width 1.25 CM carries a current of 85 micro empier and subjected to magnetic field of strength 0.85 Tesla work done for rotating the coil by the 180 against the TOK

A closed organ pipe has a fundamental frequency of 1.5 kHz. The number of overtones that can be distinctly heard by a person with this organ pipe will be: (Assume that the highest frequency a person can hear is 20,000 Hz)

A vehicle is acccelarating on a straight road. Its velocity at an instant is 30km/hr. After 2 sec ,it is 33.6 km/hr and after further 2sec it is 37.2 km/hr. Find the accelaration is m/sec.

The magnetic field existing in a region is given by B=B'(1+x/l)k". A square loop of edge l and carrying a current I; is placed with its edge parallel to the x-y axes. Find the magnitude of the net magnetic force experienced by the loop

Why is the earth in elliptical shape?

Four forces, tangent to the radius R, are acting on a wheel as shown in the figure. The resultant equivalent one force system will be,

How does the acceleration produced by a given force depend on mass of the body? Draw graph to show it.

Two blocks of mass 1 kg and 2 kg are connected by a massless string and placed on a horizontal smooth surface now and external force is applied on block of mass is 1 kg which creates a tension of 10 Newton in the string then find the value of applied force

Find the equivalent resistance between A and B.

what is gravitational mass? what other types of masses exist?

note on newton's laws of motio

During the propagation of electromagnetic waves in a medium??

A radioactive decay can form an isotope of the original nucleus with the emission of particles

72. An object start moving from rest on a straight line path with uniform acceleration and covers a distance of 100m in first 10 S. The distance it covers in next 5 s is

If two angles mirror are inclined at 90 degree the final reflected ray ra antiparallel to the incident ray , it is suffers reflection at both the mirrors

How to find error in screw gauge

The average velocity of a particle moving in a straight line, with constant acceleration, ′a′ and initial velocity, ′u′ in the first ′t′ seconds is:

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.

For the given object and mirror arrangement, the velocity (in cm/s) of the image with respect to ground will be[All the velocities are given with respect to ground]

A truck moves at 36 kmh−1. It increases its velocity to 90 kmh−1 in 0.1 minute.What is the acceleration of the truck?

25 picometre =_________centimetre

The molecular weight of O2, and N2, are 32 and 28respectively. At 15^° C the temperature of 1 g of O2 will be the same as that 1g of N2 in the same bottle at the temperature.(a) -21^° C (b) 56^° C(c)15^° C() 13^° C

If the radius of earth becomes 2 times its present value, then duration of the day would change to (mass of earth remain cons†an t Options: a- 24 h b- 12 h c-48 h d- 96 h

A particle is moving along x – axis the position of the particle at any instant is given by x = a + bt2 where a = 6m and b = 3.5mj2t is measured in s, find(i) velocity of the particle at t = 0s and t =3s (ii) the average velocity between t =3s and t = 6s

A ball is thrown such that Time of flight =5 sec and range R is 200 m. Find magnitude and direction of initial velocity(direction in †anθ

A partially inflated balloon is placed inside a bell jar connected to a vacuum pump. On creating vacuum inside the bell jar, balloon gets more inflated. How does the pressure change : increase, decrease or remains same, inside the (a) bell jar and (b) balloon ?

Refrigerator is an example of

A body is moving in a circular path of radius 0.125 m. If the body covers a distance of one quarter of the circumference of the path in √2 s, what is the velocity of the body in that distance, in m min−1?7.5

why the acceleration due to gravity is maximum at poles and minimum at equator ? explain mathematically

A body is projected vertically upwards with an initial velocity u. If the acceleration due to gravity is g, find the time wherein it remains in the air.

Why does a fountain pen leak at a high altitude ?

The loudness of source of sound at a given location increases by 10dB. By how many times does its intensity ?

a technician has two pipes of length 128m and 272m .find the maximum length of a scale which is used to measure the length of these pipes in integral form.

Three charges +4q, Q and q are placed in a straight line of length l at points O,l2 and l distance away from one end respectively. What should be Q in order to make the net force on q to be zero?

(a) Draw ray diagrams to illustrate the formation of a virtual image by using (i) a convex lens, and (ii) a concave lens.(b) What is the difference between the two images formed above?