16569 + Interview Questions in Physics

1.	Why does sodium have higher ionization energy compared to potassium?
Answer» Why does sodium have higher ionization energy compared to potassium?

Discussion

2.	The table below shows the current in three different electrical appliances when connected to the 240 V mains supply : Appliance current Kettle 8.5 A Lamp 0.4 A Toaster 4.8 A (a) Which appliance has the greatest electrical resistance ? How does the data show this ? (b) The lamp is connected to the mains supply by using a thin, twin-cored cable consisting of live and neutral wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply. (c) Calculate the power rating of the kettle when it is operated from the 240 V mains supply. (d) A man takes the kettle abroad where the mains supply is 120 V. What is the current in the kettle when it is operated from the 120 V supply ?
Answer» The table below shows the current in three different electrical appliances when connected to the 240 V mains supply : Appliance current Kettle 8.5 A Lamp 0.4 A Toaster 4.8 A (a) Which appliance has the greatest electrical resistance ? How does the data show this ? (b) The lamp is connected to the mains supply by using a thin, twin-cored cable consisting of live and neutral wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply. (c) Calculate the power rating of the kettle when it is operated from the 240 V mains supply. (d) A man takes the kettle abroad where the mains supply is 120 V. What is the current in the kettle when it is operated from the 120 V supply ?

2.

The table below shows the current in three different electrical appliances when connected to the 240 V mains supply : Appliance current Kettle 8.5 A Lamp 0.4 A Toaster 4.8 A (a) Which appliance has the greatest electrical resistance ? How does the data show this ? (b) The lamp is connected to the mains supply by using a thin, twin-cored cable consisting of live and neutral wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply. (c) Calculate the power rating of the kettle when it is operated from the 240 V mains supply. (d) A man takes the kettle abroad where the mains supply is 120 V. What is the current in the kettle when it is operated from the 120 V supply ?

Answer»

The table below shows the current in three different electrical appliances when connected to the 240 V mains supply :

Appliance current

Kettle 8.5 A

Lamp 0.4 A

Toaster 4.8 A

(a) Which appliance has the greatest electrical resistance ? How does the data show this ?

(b) The lamp is connected to the mains supply by using a thin, twin-cored cable consisting of live and neutral wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply.

(c) Calculate the power rating of the kettle when it is operated from the 240 V mains supply.

(d) A man takes the kettle abroad where the mains supply is 120 V. What is the current in the kettle when it is operated from the 120 V supply ?

Discussion

3.	If an electric wire is rated 15 Amp calculate how many electrons will pass through the conductor in 10 minutes?
Answer» If an electric wire is rated 15 Amp calculate how many electrons will pass through the conductor in 10 minutes?

Discussion

4.	Name one technique which can detect cancerous tissue inside the body of a person.
Answer» Name one technique which can detect cancerous tissue inside the body of a person.

Discussion

5.	35.What is the value of t if the amplitude is1/8 of initial ampitude in a damped oscillation? It is given that at t=4s the amplitude is half the initial amplitude in it.
Answer» 35.What is the value of t if the amplitude is1/8 of initial ampitude in a damped oscillation? It is given that at t=4s the amplitude is half the initial amplitude in it.

Discussion

6.	50. Moment of inertia of a spinning object drops to 1/3 of its initial value. The ratio of new rotational kinetic energy to initial rotational kinetic energy is ( assume net external torque about the axis of rotation is zero)
Answer» 50. Moment of inertia of a spinning object drops to 1/3 of its initial value. The ratio of new rotational kinetic energy to initial rotational kinetic energy is ( assume net external torque about the axis of rotation is zero)

Discussion

7.	35.A silver wire has diameter 0.4mm and resistivity 1.6 x10power-8.How much length of this where is required to make a 1 ohm coil.
Answer» 35.A silver wire has diameter 0.4mm and resistivity 1.6 x10power-8.How much length of this where is required to make a 1 ohm coil.

Discussion

8.	10. Faradays law of electricity indirectily shows1)quaanization of charge2)quantization of current
Answer» 10. Faradays law of electricity indirectily shows1)quaanization of charge2)quantization of current

Discussion

9.	In an ideal vapour compression refrigeration cycle, the specific enthalpy of refrigerant (in kJ/kg) at the following states is given as:Inlet of condenser: 283Exit of condenser: 116Exit of evaporator: 232The COP of this cycle is
Answer» In an ideal vapour compression refrigeration cycle, the specific enthalpy of refrigerant (in kJ/kg) at the following states is given as: Inlet of condenser: 283 Exit of condenser: 116 Exit of evaporator: 232 The COP of this cycle is

Discussion

10.	100. In the given circuit diagram, the key K is switched on at t = 0. The ratio of the current i through the cell at t = 0 and t = infinity be (a) 3:1 (b)1:3 (c)1:2 (d)2:1
Answer» 100. In the given circuit diagram, the key K is switched on at t = 0. The ratio of the current i through the cell at t = 0 and t = infinity be (a) 3:1 (b)1:3 (c)1:2 (d)2:1

Discussion

11.	Why is the red color selected for danger signal lights?
Answer» Why is the red color selected for danger signal lights?

Discussion

12.	ten 60W, 220 V bulbs are connected in series to220V supply power consumed in circuit i
Answer» ten 60W, 220 V bulbs are connected in series to220V supply power consumed in circuit i

Discussion

13.	Find the height at which the weight will be same as at the same depth from the surface of the earth.
Answer» Find the height at which the weight will be same as at the same depth from the surface of the earth.

Discussion

14.	A lead bullet strikes against a steel armor plate with the velocity of 300 meter/second. If the bullet, assuming that the impact is perfectly inelastic find the rise in temperature of the bullet. Assume that the heat produced is shared equally between the bullet and the target, specific heat of lead = 0.03 cal/g/∘C
Answer» A lead bullet strikes against a steel armor plate with the velocity of 300 meter/second. If the bullet, assuming that the impact is perfectly inelastic find the rise in temperature of the bullet. Assume that the heat produced is shared equally between the bullet and the target, specific heat of lead = $0.03 c a l / g /^{\circ} C$

Discussion

15.	Plz explain what is prism and can any object behave like a prism
Answer» Plz explain what is prism and can any object behave like a prism

Discussion

16.	What is the function of iris?
Answer» What is the function of iris?

Discussion

17.	A long straight wire of circular cross-section is made of non magnetic material. The wire is of radius a. The wire carries a current I which is uniformly distributed over is its cross section. The energy stored per unit length in magnetic field contained within the wire is
Answer» A long straight wire of circular cross-section is made of non magnetic material. The wire is of radius a. The wire carries a current I which is uniformly distributed over is its cross section. The energy stored per unit length in magnetic field contained within the wire is

Discussion

18.	Consider two point charges of equal magnitude and opposite sign separated by certain distance. The neutral point due to them
Answer» Consider two point charges of equal magnitude and opposite sign separated by certain distance. The neutral point due to them

Discussion

19.	Choose the correct options from the following, If two objects are in resonance with each other:
Answer» Choose the correct options from the following, If two objects are in resonance with each other:

Discussion

20.	Explain the mirage effect.
Answer» Explain the mirage effect.

Discussion

21.	Define one ohm.
Answer» Define one ohm.

Discussion

22.	Why Kcl on heating strongly gives violet colour and NaCl gives yellow colour name the type of defect and explain
Answer» Why Kcl on heating strongly gives violet colour and NaCl gives yellow colour name the type of defect and explain

Discussion

23.	102.Calculate the refractive index of glass with respect to air if its critical angle is 37
Answer» 102.Calculate the refractive index of glass with respect to air if its critical angle is 37

Discussion

24.	A radioactive substance of half life 69.3 days is kept in a container. The time in which 80% of the substance will disintegrate will be [take ln(5) = 1.61]
Answer» A radioactive substance of half life 69.3 days is kept in a container. The time in which 80% of the substance will disintegrate will be [take ln(5) = 1.61]

Discussion

25.	How sun and stars have light emitting power only why dontd humans have ?
Answer» How sun and stars have light emitting power only why dontd humans have ?

Discussion

26.	A bomb of mass 4 kg explodes in air into two pieces of masses 3 kg and 1 kg. The smaller mass goes at a speed of 90 m/s. The total energy imparted to two fragments is.
Answer» A bomb of mass 4 kg explodes in air into two pieces of masses 3 kg and 1 kg. The smaller mass goes at a speed of 90 m/s. The total energy imparted to two fragments is.

Discussion

27.	The waves of 600 μ m wavelength are incident normally on a slit of 1.2 mm width. the value of diffraction angle corresponding to the first minima will be (in radian
Answer» The waves of 600 μ m wavelength are incident normally on a slit of 1.2 mm width. the value of diffraction angle corresponding to the first minima will be (in radian

Discussion

28.	A geostationary satellite is orbiting the earth at a height of 5R above the surface of the earth, R being the radius of the earth. The time period of another satellite in hours at a height of 2R from the surface of the earth is
Answer» A geostationary satellite is orbiting the earth at a height of $5 R$ above the surface of the earth, $R$ being the radius of the earth. The time period of another satellite in hours at a height of $2 R$ from the surface of the earth is

Discussion

29.	94. Find (266) raisedto power 0.16and * (256) raised to power 0.09 =
Answer» 94. Find (266) raisedto power 0.16and * (256) raised to power 0.09 =

Discussion

30.	Lens will be invisible in water (n1.33) when therefractive index of the lens is(1) 1.33(2) Less than 1.33(3) Greater than 1.33(4) All of these
Answer» Lens will be invisible in water (n1.33) when therefractive index of the lens is(1) 1.33(2) Less than 1.33(3) Greater than 1.33(4) All of these

Discussion

31.	Ram and Shyam are climbing a tree. Ram weighs 50 kg and Shyam weighs 60 kg. Power expended by Ram and Shyam to climb the tree are in the ratio of 3:2. What is the ratio of time taken by Ram and time were taken by Shyam to climb the tree?
Answer» Ram and Shyam are climbing a tree. Ram weighs 50 kg and Shyam weighs 60 kg. Power expended by Ram and Shyam to climb the tree are in the ratio of 3:2. What is the ratio of time taken by Ram and time were taken by Shyam to climb the tree?

Discussion

32.	I N WHICH CONDITIONS OPEN AND CLOSED AND CURLY BRACKETS ARE USE
Answer» I N WHICH CONDITIONS OPEN AND CLOSED AND CURLY BRACKETS ARE USE

Discussion

33.	What are sympathetic vibrations ? What are its examples ?
Answer» What are sympathetic vibrations ? What are its examples ?

Discussion

34.	The temperature at triple point of water is:
Answer» The temperature at triple point of water is:

Discussion

35.	Why does a compass needle get deflected when brought near a bar magnet?
Answer» Why does a compass needle get deflected when brought near a bar magnet?

Discussion

36.	A closely wounded cylindrical coil whose diameter is less in comparison to its length is named as:
Answer» A closely wounded cylindrical coil whose diameter is less in comparison to its length is named as:

Discussion

37.	A man observes the sunrise and sunset at 5:58 AM and 5:32 PM respectively. What is the length of the day between the actual sunrise and sunset?
Answer» A man observes the sunrise and sunset at $5 : 58 A M$ and $5 : 32 P M$ respectively. What is the length of the day between the actual sunrise and sunset?

Discussion

38.	A power station consists of two synchronous generators of rating 500 MVA and 1000MVA with inertia 0.8 pu and 0.5 pu respectively on their own bases MVA rating. The equivalent pu inertia constant on 200 MVA common base is___.4.5
Answer» A power station consists of two synchronous generators of rating 500 MVA and 1000MVA with inertia 0.8 pu and 0.5 pu respectively on their own bases MVA rating. The equivalent pu inertia constant on 200 MVA common base is___. 4.5

Discussion

39.	121.Which of the following is not equal to watt? A)joule /sec B)Ampere volt c) ampere square ohm D)Ampere /volt
Answer» 121.Which of the following is not equal to watt? A)joule /sec B)Ampere volt c) ampere square ohm D)Ampere /volt

Discussion

40.	Why does a hunged bar magnet on a string only points to north south direction and no where else ?
Answer» Why does a hunged bar magnet on a string only points to north south direction and no where else ?

Discussion

41.	∫_2^31/x\operatorname dx integratio
Answer» ∫_2^31/x\operatorname dx integratio

Discussion

42.	An electric circuit conducting a power source, a bulb and two switches (S1,S2) is shown in the figure.The above circuit is equivalent to which of the following logic gate circuits ?
Answer» An electric circuit conducting a power source, a bulb and two switches $(S_{1}, S_{2})$ is shown in the figure. The above circuit is equivalent to which of the following logic gate circuits ?

Discussion

43.	Name and state the rule by which the polarity at the ends of a current carrying solenoid is determined.
Answer» Name and state the rule by which the polarity at the ends of a current carrying solenoid is determined.

Discussion

44.	how astronaut talk in space
Answer» how astronaut talk in space

Discussion

45.	Write equation for displacement of wave.
Answer» Write equation for displacement of wave.

Discussion

46.	Why does resistance happens?
Answer» Why does resistance happens?

Discussion

47.	What will happen to a car moving on a circular path if the friction between the car and the road suddenly disappears?
Answer» What will happen to a car moving on a circular path if the friction between the car and the road suddenly disappears?

Discussion

48.	The change of energy on freezing 1.00kg of liquid water at 0^°C and 1 arm is .
Answer» The change of energy on freezing 1.00kg of liquid water at 0^°C and 1 arm is .

Discussion

49.	A pencil is placed at 10 cm from a concave lens. The image of the pencil is formed at 15 cm from the lens on the same side. What will be the magnification of the lens?1.5
Answer» A pencil is placed at 10 cm from a concave lens. The image of the pencil is formed at 15 cm from the lens on the same side. What will be the magnification of the lens? 1.5

Discussion

50.	A student boils the water in an electric kettle for 20 minutes. Using the same main supply, he wants to reduce the boiling time of water. To do so, should he increase or decrease the length of the heating element? Justify your answer
Answer» A student boils the water in an electric kettle for 20 minutes. Using the same main supply, he wants to reduce the boiling time of water. To do so, should he increase or decrease the length of the heating element? Justify your answer

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Why does sodium have higher ionization energy compared to potassium?

If an electric wire is rated 15 Amp calculate how many electrons will pass through the conductor in 10 minutes?

Name one technique which can detect cancerous tissue inside the body of a person.

35.What is the value of t if the amplitude is1/8 of initial ampitude in a damped oscillation? It is given that at t=4s the amplitude is half the initial amplitude in it.

50. Moment of inertia of a spinning object drops to 1/3 of its initial value. The ratio of new rotational kinetic energy to initial rotational kinetic energy is ( assume net external torque about the axis of rotation is zero)

35.A silver wire has diameter 0.4mm and resistivity 1.6 x10power-8.How much length of this where is required to make a 1 ohm coil.

10. Faradays law of electricity indirectily shows1)quaanization of charge2)quantization of current

In an ideal vapour compression refrigeration cycle, the specific enthalpy of refrigerant (in kJ/kg) at the following states is given as:Inlet of condenser: 283Exit of condenser: 116Exit of evaporator: 232The COP of this cycle is

100. In the given circuit diagram, the key K is switched on at t = 0. The ratio of the current i through the cell at t = 0 and t = infinity be (a) 3:1 (b)1:3 (c)1:2 (d)2:1

Why is the red color selected for danger signal lights?

ten 60W, 220 V bulbs are connected in series to220V supply power consumed in circuit i

Find the height at which the weight will be same as at the same depth from the surface of the earth.

Plz explain what is prism and can any object behave like a prism

What is the function of iris?

A long straight wire of circular cross-section is made of non magnetic material. The wire is of radius a. The wire carries a current I which is uniformly distributed over is its cross section. The energy stored per unit length in magnetic field contained within the wire is

Consider two point charges of equal magnitude and opposite sign separated by certain distance. The neutral point due to them

Choose the correct options from the following, If two objects are in resonance with each other:

Explain the mirage effect.

Define one ohm.

Why Kcl on heating strongly gives violet colour and NaCl gives yellow colour name the type of defect and explain

102.Calculate the refractive index of glass with respect to air if its critical angle is 37

A radioactive substance of half life 69.3 days is kept in a container. The time in which 80% of the substance will disintegrate will be [take ln(5) = 1.61]

How sun and stars have light emitting power only why dontd humans have ?

A bomb of mass 4 kg explodes in air into two pieces of masses 3 kg and 1 kg. The smaller mass goes at a speed of 90 m/s. The total energy imparted to two fragments is.

The waves of 600 μ m wavelength are incident normally on a slit of 1.2 mm width. the value of diffraction angle corresponding to the first minima will be (in radian

A geostationary satellite is orbiting the earth at a height of 5R above the surface of the earth, R being the radius of the earth. The time period of another satellite in hours at a height of 2R from the surface of the earth is

94. Find (266) raisedto power 0.16and * (256) raised to power 0.09 =

Lens will be invisible in water (n1.33) when therefractive index of the lens is(1) 1.33(2) Less than 1.33(3) Greater than 1.33(4) All of these

Ram and Shyam are climbing a tree. Ram weighs 50 kg and Shyam weighs 60 kg. Power expended by Ram and Shyam to climb the tree are in the ratio of 3:2. What is the ratio of time taken by Ram and time were taken by Shyam to climb the tree?

I N WHICH CONDITIONS OPEN AND CLOSED AND CURLY BRACKETS ARE USE

What are sympathetic vibrations ? What are its examples ?

The temperature at triple point of water is:

Why does a compass needle get deflected when brought near a bar magnet?

A closely wounded cylindrical coil whose diameter is less in comparison to its length is named as:

A man observes the sunrise and sunset at 5:58 AM and 5:32 PM respectively. What is the length of the day between the actual sunrise and sunset?

A power station consists of two synchronous generators of rating 500 MVA and 1000MVA with inertia 0.8 pu and 0.5 pu respectively on their own bases MVA rating. The equivalent pu inertia constant on 200 MVA common base is___.4.5

121.Which of the following is not equal to watt? A)joule /sec B)Ampere volt c) ampere square ohm D)Ampere /volt

Why does a hunged bar magnet on a string only points to north south direction and no where else ?

∫_2^31/x\operatorname dx integratio

An electric circuit conducting a power source, a bulb and two switches (S1,S2) is shown in the figure.The above circuit is equivalent to which of the following logic gate circuits ?

Name and state the rule by which the polarity at the ends of a current carrying solenoid is determined.

how astronaut talk in space

Write equation for displacement of wave.

Why does resistance happens?

What will happen to a car moving on a circular path if the friction between the car and the road suddenly disappears?

The change of energy on freezing 1.00kg of liquid water at 0^°C and 1 arm is .

A pencil is placed at 10 cm from a concave lens. The image of the pencil is formed at 15 cm from the lens on the same side. What will be the magnification of the lens?1.5

A student boils the water in an electric kettle for 20 minutes. Using the same main supply, he wants to reduce the boiling time of water. To do so, should he increase or decrease the length of the heating element? Justify your answer