16569 + Interview Questions in Physics Page 15 InterviewSolution

701.	A resistor has a resistance fo 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line?
Answer» A resistor has a resistance fo 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line?

701.

A resistor has a resistance fo 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line?

Answer»

A resistor

has a resistance fo 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line?

Discussion

702.	The index of refraction of diamond is 2.0, velocity of light in diamond in cm/s is approximately
Answer» The index of refraction of diamond is $2.0$ , velocity of light in diamond in $cm/s$ is approximately

Discussion

703.	Two equal point charges A and B are R distance apart. A third point charge placed on the perpendicularbisector at a distance ‘d’ from the centre will experience maximum electrostatic force when d=?
Answer» Two equal point charges A and B are R distance apart. A third point charge placed on the perpendicular bisector at a distance ‘d’ from the centre will experience maximum electrostatic force when d=?

Discussion

704.	A star emitting a wavelength of 6000 ˚A is moving away from the earth with a speed of 5 km/s. Due to Doppler effect, the change in wavelength will be,(Given: c=3×108 m/s)
Answer» A star emitting a wavelength of $6000 ˚ A$ is moving away from the earth with a speed of $5 km/s$ . Due to Doppler effect, the change in wavelength will be, (Given: $c = 3 \times 10^{8} m/s$ )

Discussion

705.	The correct relation between the density(d), temperature(T) and pressure(P) for an ideal gas having molar mass (M) is given by
Answer» The correct relation between the density $(d)$ , temperature $(T)$ and pressure $(P)$ for an ideal gas having molar mass $(M)$ is given by

Discussion

706.	If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is : (a) 5 cm (b) 10 cm (c) 18 cm (d) 20 cm
Answer» If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is : (a) 5 cm (b) 10 cm (c) 18 cm (d) 20 cm

706.

If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is : (a) 5 cm (b) 10 cm (c) 18 cm (d) 20 cm

Answer»

If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is :

(a) 5 cm

(b) 10 cm

(c) 18 cm

(d) 20 cm

Discussion

707.	which sign conventions are used while solving sums based on convex Mirrors example what value we should take for focal length while solving sums on convex Mirrors
Answer» which sign conventions are used while solving sums based on convex Mirrors example what value we should take for focal length while solving sums on convex Mirrors

Discussion

708.	The magnetic field of a solenoid can be made stronger by
Answer» The magnetic field of a solenoid can be made stronger by

Discussion

709.	The magnifying power of a telescope is 11. When it is adjusted for parallel rays, the distance between the objective lens and eyepiece is found to be 24 cm. The focal length of lenses are
Answer» The magnifying power of a telescope is $11$ . When it is adjusted for parallel rays, the distance between the objective lens and eyepiece is found to be $24 cm$ . The focal length of lenses are

Discussion

710.	A heat pump absorbs 10 kW of heat from outside environment at 250 K while absorbing 15 kW of work. It delivers the heat to a room that must be kept warm at 300 K. The Coefficient of Performance (COP) of the heat pump is 1.67
Answer» A heat pump absorbs $10$ kW of heat from outside environment at $250$ K while absorbing $15$ kW of work. It delivers the heat to a room that must be kept warm at $300$ K. The Coefficient of Performance (COP) of the heat pump is 1.67

Discussion

711.	A 1000 W heater is used for 1 hr every day for 30 days. Find the cost of electricity if the rate is Rs. 3/unit.
Answer» A $1000 W$ heater is used for $1 hr$ every day for $30$ days. Find the cost of electricity if the rate is $Rs. 3 / unit$ .

Discussion

712.	Can a lens act both as a converging and diverging lens ? If so please explain the thing.
Answer» Can a lens act both as a converging and diverging lens ? If so please explain the thing.

Discussion

713.	The two resistance R1 and R2 are joined in parallel the equivalent resistance are such that
Answer» The two resistance R1 and R2 are joined in parallel the equivalent resistance are such that

Discussion

714.	(a) State what would happed to the direction of rotation of a motor if : (i) the current were reversed (ii) the magnetic field were reversed (iii) both current and magnetic field were rerversed simultaneously. (b) In what ways can a motor be made more powerful ?
Answer» (a) State what would happed to the direction of rotation of a motor if : (i) the current were reversed (ii) the magnetic field were reversed (iii) both current and magnetic field were rerversed simultaneously. (b) In what ways can a motor be made more powerful ?

714.

(a) State what would happed to the direction of rotation of a motor if : (i) the current were reversed (ii) the magnetic field were reversed (iii) both current and magnetic field were rerversed simultaneously. (b) In what ways can a motor be made more powerful ?

Answer»

(a) State what would happed to the direction of rotation of a motor if :

(i) the current were reversed

(ii) the magnetic field were reversed

(iii) both current and magnetic field were rerversed simultaneously.

(b) In what ways can a motor be made more powerful ?

Discussion

715.	Prism angle and refractive index for a prism are 60∘ and 1.414 respectively. Then what will be the Angle of minimum deviation?
Answer» Prism angle and refractive index for a prism are $60^{\circ}$ and $1.414$ respectively. Then what will be the Angle of minimum deviation?

Discussion

716.	In the logic circuit shown in the figure, if input A and B are 0 to 1 respectively, the output at Y would be ′x′. the value of x is .
Answer» In the logic circuit shown in the figure, if input A and B are $0$ to $1$ respectively, the output at Y would be $^{'} x^{'}$ . the value of $x$ is .

Discussion

717.	Choose the correct relation between I, q and t (I - current, q - charge, t - time).
Answer» Choose the correct relation between $I, q$ and $t$ (I - current, q - charge, t - time).

Discussion

718.	Question 12The most important safety method used for protecting home appliances from short circuiting or overloading is(a) earthing(b) use of fuse(c) use of stabilizers(d) use of electric meter
Answer» Question 12 The most important safety method used for protecting home appliances from short circuiting or overloading is (a) earthing (b) use of fuse (c) use of stabilizers (d) use of electric meter

Discussion

719.	Which is the ultimate source of energy?
Answer» Which is the ultimate source of energy?

Discussion

720.	A loop of flexible conducting wire of length l lies in magnetic field b which is normal to the plane of loop. A current I is passed through the loop. The trnsion developed in the wire of loop πBIl/2 BIl/2BIl/2πBIl
Answer» A loop of flexible conducting wire of length l lies in magnetic field b which is normal to the plane of loop. A current I is passed through the loop. The trnsion developed in the wire of loop πBIl/2 BIl/2 BIl/2π BIl

Discussion

721.	Bullets of 0.03 kg mass each hit a plate at the rate of 200 bullets per second, with a velocity of 50 m/s and reflect back with a velocity of 30 m/s. Find average force acting on the plate.
Answer» Bullets of 0.03 kg mass each hit a plate at the rate of 200 bullets per second, with a velocity of 50 m/s and reflect back with a velocity of 30 m/s. Find average force acting on the plate.

Discussion

722.	An object is placed at a distance of 30 cm from the lens. Its image is formed at a distance of 10 cm on the same side of the lens. Find the focal length of the lens used.
Answer» An object is placed at a distance of $30 c m$ from the lens. Its image is formed at a distance of $10 c m$ on the same side of the lens. Find the focal length of the lens used.

Discussion

723.

Remake the table taking into account relation between entries in three columns. I II III Coal Potential Energy Wind electricity plant Uranium Kinetic Energy Hydro electric plant Water Reservoir Nuclear Energy Thermal plant Wind Thermal Energy Nuclear power plant

Answer» Remake the table taking into account relation between entries in three columns.

I	II	III
Coal	Potential Energy	Wind electricity plant
Uranium	Kinetic Energy	Hydro electric plant
Water Reservoir	Nuclear Energy	Thermal plant
Wind	Thermal Energy	Nuclear power plant

Discussion

724.	What happens to the image formed by a convex lens if its lower part is blackened?
Answer» What happens to the image formed by a convex lens if its lower part is blackened?

Discussion

725.	The value of g at a certain height h above the free surface of earth is , where x is the value of g at the surface of earth. The height h is
Answer» The value of g at a certain height h above the free surface of earth is , where x is the value of g at the surface of earth. The height h is

Discussion

726.	Explain the law of momentum of conservation
Answer» Explain the law of momentum of conservation

Discussion

727.	A heater coil is rated 100w,200v. It is cut into two identical parts. Both parts are connected together in parallel to the same source of 200v. Calulate the energy liberated per second in the new combination.
Answer» A heater coil is rated 100w,200v. It is cut into two identical parts. Both parts are connected together in parallel to the same source of 200v. Calulate the energy liberated per second in the new combination.

Discussion

728.	Question 1Which one of the following materials cannot be used to make a lens?(a) Water(b) Glass(c) Plastic(d) Clay
Answer» Question 1 Which one of the following materials cannot be used to make a lens? (a) Water (b) Glass (c) Plastic (d) Clay

Discussion

729.	Which sources produce alternating current?
Answer» Which sources produce alternating current?

Discussion

730.	8. Mechanism of raschig process
Answer» 8. Mechanism of raschig process

Discussion

731.	water is flowing through a horizontal pipe with speed 2m/s and powet required to maintain the flow is 20W. If speed becomes double the power required will be
Answer» water is flowing through a horizontal pipe with speed 2m/s and powet required to maintain the flow is 20W. If speed becomes double the power required will be

Discussion

732.	Why are sign conventions for doppler's effect in sound different from doppler's effect in light?
Answer» Why are sign conventions for doppler's effect in sound different from doppler's effect in light?

Discussion

733.	How does cornea functions
Answer» How does cornea functions

Discussion

734.	57.A beam of white light when passed through a hollow prism, cannot give spectrum. Why? Does outer surface of prism does not affect dispersion?
Answer» 57.A beam of white light when passed through a hollow prism, cannot give spectrum. Why? Does outer surface of prism does not affect dispersion?

Discussion

735.	The furthermost point of distinct vision of a short-sighted person is 200 cm. What spectacles would she require to enable her to see distant objects clearly?
Answer» The furthermost point of distinct vision of a short-sighted person is 200 cm. What spectacles would she require to enable her to see distant objects clearly?

Discussion

736.	Question 13 (b)A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is(ii) withdrawn from inside the coil?
Answer» Question 13 (b) A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (ii) withdrawn from inside the coil?

Discussion

737.	In amplitude modulation, sinusoidal carrier frequency used is denoted by ωc and the signal frequency is denoted by ωm. The bandwidth (△ωm) of the signal is such that △ωm<<ωc. Which of the following frequencies is not contained in the modulated wave?
Answer» In amplitude modulation, sinusoidal carrier frequency used is denoted by $ω_{c}$ and the signal frequency is denoted by $ω_{m}$ . The bandwidth $(△ ω_{m})$ of the signal is such that $△ ω_{m} << ω_{c}$ . Which of the following frequencies is not contained in the modulated wave?

Discussion

738.	Excessive combustion of fossil fuels leads to __________.
Answer» Excessive combustion of fossil fuels leads to __________.

Discussion

739.	In Ampere circuital law, the current outside a curve is not included. Does it mean that magnetic field B calculated using this law gives the contribution of only currents crossing the area bounded by the curve? Explain.
Answer» In Ampere circuital law, the current outside a curve is not included. Does it mean that magnetic field B calculated using this law gives the contribution of only currents crossing the area bounded by the curve? Explain.

Discussion

740.	Define symbols I,R,V,Q,W,
Answer» Define symbols I,R,V,Q,W,

740.

Define symbols I,R,V,Q,W,

Answer»

Define symbols

I,R,V,Q,W,

Discussion

741.	Find the position and nature of the image of an object 5 cm high and 10 cm in front of a convex lens of focal length 6 cm.
Answer» Find the position and nature of the image of an object 5 cm high and 10 cm in front of a convex lens of focal length 6 cm.

Discussion

742.	Write the approximate value of specific heat capacity of water in S.I.unit.
Answer» Write the approximate value of specific heat capacity of water in S.I.unit.

Discussion

743.	One of the following do not represent electrical power
Answer» One of the following do not represent electrical power

Discussion

744.	how much water would be filled in a container of height 21c so that it appears hal filled to the observer when viewd from the top of the container.given refrative index of water is 4/
Answer» how much water would be filled in a container of height 21c so that it appears hal filled to the observer when viewd from the top of the container.given refrative index of water is 4/

Discussion

745.	Name and state the law which is used to determine the direction of force on a current carrying conductor placed in a magnetic field.
Answer» Name and state the law which is used to determine the direction of force on a current carrying conductor placed in a magnetic field.

Discussion

746.	Question 34Draw ray diagrams showing the image formation by a convex mirror when an object is placed(a) at infinity(b) at finite distance from the mirror
Answer» Question 34 Draw ray diagrams showing the image formation by a convex mirror when an object is placed (a) at infinity (b) at finite distance from the mirror

Discussion

747.	Radius of a circular loop placed in a perpendicularuniform magnetic field is increasing at a constantrate of r m s1. If at any instant radius of the loopis r, then emf induced in the loop at that instant willbe(1) -2Brr(2) -2Bru(3) -BTuof(4) -2BTrf
Answer» Radius of a circular loop placed in a perpendicularuniform magnetic field is increasing at a constantrate of r m s1. If at any instant radius of the loopis r, then emf induced in the loop at that instant willbe(1) -2Brr(2) -2Bru(3) -BTuof(4) -2BTrf

Discussion

748.	A ray of light coming from a denser medium does not enter rarer medium and reflects back. This phenomenon is called ___.
Answer» A ray of light coming from a denser medium does not enter rarer medium and reflects back. This phenomenon is called ___.

Discussion

749.	What is the shape of rods and cones?
Answer» What is the shape of rods and cones?

Discussion

750.	A block of ice at −10oC is slowly heated and converted to steam at 100oC. Which of the following curves represents the phenomenon qualitatively?
Answer» A block of ice at $- 10^{o} C$ is slowly heated and converted to steam at $100^{o} C .$ Which of the following curves represents the phenomenon qualitatively?

Discussion

Explore topic-wise InterviewSolutions in .

A resistor has a resistance fo 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line?

The index of refraction of diamond is 2.0, velocity of light in diamond in cm/s is approximately

Two equal point charges A and B are R distance apart. A third point charge placed on the perpendicularbisector at a distance ‘d’ from the centre will experience maximum electrostatic force when d=?

A star emitting a wavelength of 6000 ˚A is moving away from the earth with a speed of 5 km/s. Due to Doppler effect, the change in wavelength will be,(Given: c=3×108 m/s)

The correct relation between the density(d), temperature(T) and pressure(P) for an ideal gas having molar mass (M) is given by

If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is : (a) 5 cm (b) 10 cm (c) 18 cm (d) 20 cm

which sign conventions are used while solving sums based on convex Mirrors example what value we should take for focal length while solving sums on convex Mirrors

The magnetic field of a solenoid can be made stronger by

The magnifying power of a telescope is 11. When it is adjusted for parallel rays, the distance between the objective lens and eyepiece is found to be 24 cm. The focal length of lenses are

A heat pump absorbs 10 kW of heat from outside environment at 250 K while absorbing 15 kW of work. It delivers the heat to a room that must be kept warm at 300 K. The Coefficient of Performance (COP) of the heat pump is 1.67

A 1000 W heater is used for 1 hr every day for 30 days. Find the cost of electricity if the rate is Rs. 3/unit.

Can a lens act both as a converging and diverging lens ? If so please explain the thing.

The two resistance R1 and R2 are joined in parallel the equivalent resistance are such that

(a) State what would happed to the direction of rotation of a motor if : (i) the current were reversed (ii) the magnetic field were reversed (iii) both current and magnetic field were rerversed simultaneously. (b) In what ways can a motor be made more powerful ?

Prism angle and refractive index for a prism are 60∘ and 1.414 respectively. Then what will be the Angle of minimum deviation?

In the logic circuit shown in the figure, if input A and B are 0 to 1 respectively, the output at Y would be ′x′. the value of x is .

Choose the correct relation between I, q and t (I - current, q - charge, t - time).

Question 12The most important safety method used for protecting home appliances from short circuiting or overloading is(a) earthing(b) use of fuse(c) use of stabilizers(d) use of electric meter​​​​​​​

Which is the ultimate source of energy?

A loop of flexible conducting wire of length l lies in magnetic field b which is normal to the plane of loop. A current I is passed through the loop. The trnsion developed in the wire of loop πBIl/2 BIl/2BIl/2πBIl

Bullets of 0.03 kg mass each hit a plate at the rate of 200 bullets per second, with a velocity of 50 m/s and reflect back with a velocity of 30 m/s. Find average force acting on the plate.

An object is placed at a distance of 30 cm from the lens. Its image is formed at a distance of 10 cm on the same side of the lens. Find the focal length of the lens used.

Remake the table taking into account relation between entries in three columns. I II III Coal Potential Energy Wind electricity plant Uranium Kinetic Energy Hydro electric plant Water Reservoir Nuclear Energy Thermal plant Wind Thermal Energy Nuclear power plant

What happens to the image formed by a convex lens if its lower part is blackened?

The value of g at a certain height h above the free surface of earth is , where x is the value of g at the surface of earth. The height h is

Explain the law of momentum of conservation

A heater coil is rated 100w,200v. It is cut into two identical parts. Both parts are connected together in parallel to the same source of 200v. Calulate the energy liberated per second in the new combination.

Question 1Which one of the following materials cannot be used to make a lens?(a) Water(b) Glass(c) Plastic(d) Clay

Which sources produce alternating current?

8. Mechanism of raschig process

water is flowing through a horizontal pipe with speed 2m/s and powet required to maintain the flow is 20W. If speed becomes double the power required will be

Why are sign conventions for doppler's effect in sound different from doppler's effect in light?

How does cornea functions

57.A beam of white light when passed through a hollow prism, cannot give spectrum. Why? Does outer surface of prism does not affect dispersion?

The furthermost point of distinct vision of a short-sighted person is 200 cm. What spectacles would she require to enable her to see distant objects clearly?

Question 13 (b)A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is(ii) withdrawn from inside the coil?

In amplitude modulation, sinusoidal carrier frequency used is denoted by ωc and the signal frequency is denoted by ωm. The bandwidth (△ωm) of the signal is such that △ωm&lt;&lt;ωc. Which of the following frequencies is not contained in the modulated wave?

Excessive combustion of fossil fuels leads to __________.

In Ampere circuital law, the current outside a curve is not included. Does it mean that magnetic field B calculated using this law gives the contribution of only currents crossing the area bounded by the curve? Explain.

Define symbols I,R,V,Q,W,

Find the position and nature of the image of an object 5 cm high and 10 cm in front of a convex lens of focal length 6 cm.

Write the approximate value of specific heat capacity of water in S.I.unit.

One of the following do not represent electrical power

how much water would be filled in a container of height 21c so that it appears hal filled to the observer when viewd from the top of the container.given refrative index of water is 4/

Name and state the law which is used to determine the direction of force on a current carrying conductor placed in a magnetic field.

Question 34Draw ray diagrams showing the image formation by a convex mirror when an object is placed(a) at infinity(b) at finite distance from the mirror

Radius of a circular loop placed in a perpendicularuniform magnetic field is increasing at a constantrate of r m s1. If at any instant radius of the loopis r, then emf induced in the loop at that instant willbe(1) -2Brr(2) -2Bru(3) -BTuof(4) -2BTrf

A ray of light coming from a denser medium does not enter rarer medium and reflects back. This phenomenon is called ___.

What is the shape of rods and cones?

A block of ice at −10oC is slowly heated and converted to steam at 100oC. Which of the following curves represents the phenomenon qualitatively?

Question 12The most important safety method used for protecting home appliances from short circuiting or overloading is(a) earthing(b) use of fuse(c) use of stabilizers(d) use of electric meter

In amplitude modulation, sinusoidal carrier frequency used is denoted by ωc and the signal frequency is denoted by ωm. The bandwidth (△ωm) of the signal is such that △ωm<<ωc. Which of the following frequencies is not contained in the modulated wave?