R2 R

Q: W One mole of an ideal gas initially at a temperature of Ti = 0°C undergoes an expansion at a consta...

A: It is given that

Q: In tearing a paper towel or plastic bag from a roll, why is a sharp jerk more effective than a slow ...

A: Initially, the tower is in rest. Using the idea of inertia and Newton’s second law of motion, the to...

Q: The thermal conductivities of human tissues vary greatly. Fat and skin have conductivities of about ...

A: Let L be thickness of the material and k be its thermal conductivity, then the R value of the materi...

Q: What are the applications of operational amplifier?

A: Operational amplifier also known as Op-amp are used in variety of applications in electronics. Op-am...

Q: Is the force of gravity stronger on piece of iron than on the piece of wood if both have the same ma...

A:

Q: (5) An object 2.0 mm high is placed 18 cm from a convex mirror of radius of curvature 18 cm. (a)Sele...

A:

Q: A heavy bird sits on a clothesline. Will the tension in the clothesline be greater if the line sags ...

A:

Q: Explain rectifier.

A:

Q: How much time is taken for complete revolution of a satellite in close orbit about the Earth?

A: The time taken by the satellite to complete one revolution in its orbit around the earth is known as...

Q: What is a good source of energy?

A:

Q: Why is the color of the clear sky is blue?

A:

Q: Judge the equivalent resistance when the following are connected in parallel – (a) 1 Ω and 106 Ω, (b...

A:

Q: Explain the need of doping a pure semiconductor.

A: Doping is a process of adding unwanted impurities into a semiconductor device. Doping is done to inc...

Q: To lift a wire ring of radius 1.75 cm from the surface of a container of blood plasma, a vertical fo...

A:

Q: Several electric bulbs designed to be used on a 220 V electric supply line, arerated 10 W. How many ...

A:

Q: A zener diode is specified as having a brealdown voltage 9.1V, with a maximum power of 364mW. What i...

A:

Q: Suppose a distant world with surface gravity of 7.44 m/s2 has an atmospheric pressure of 8.04 × 104 ...

A: Part A:

Q: How far does a horse travel if it gallops at an average speed of 25 km/h for 30 min?

A: The expression for distance in terms of acceleration is,

Q: Define Voltage Stabiliser.

A: A Voltage Stabilizer is an electrical device used at its output terminals to provide a constant volt...

Q: A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his n...

A:

Q: If you punch a hole in a container filled with water, in what direction does the water initially flo...

A:

Q: When a sealed Thermos bottle full of hot coffee is shaken, what changes, if any, take place in (a) t...

A: The molecular temperature is directly proportional to the average kinetic energy of the molecules.

Q: Define Geothermal Energy.

A: Geothermal energy is thermal energy which is generated and stored in the Earth. It refers to the pro...

Q: When does an electric short circuit occur?

A: A common kind of short circuit happens when a battery's positive and negative terminals are attached...

Q: orbital speed and orbital radius of a satallite moving around a planet of mass 4.68*10^23 kg are 375...

A:

Q: What is photodiode?

A: A photodiode is a semiconductor device which converts light energy into electrical energy. An electr...

Q: In half-wave rectification, what is the output frequency if the input frequency is 50 Hz. What is th...

A:

Q: A car is stopped for a traffic signal. When the light turns green, the car accelerates, increasing i...

A:

Q: Draw and explain circuit diagram of Zener diode as voltage stabiliser.

A: A Zener diode is a semiconductor diode which is operated in reverse bias condition. In comparison to...

Q: The rope supports a lantern that weighs 50 N. Is the tension in the rope less than, equal to, or gre...

A:

Q: How can gravity be stimulated in an orbiting space station?

A: Answer:- Find how can gravity be stimulated in an orbiting space station. Now, Gravity is often simu...

Q: A weather balloon is designed to expand to a maximum radius of 20 m at its working altitude, where t...

A: Pressures,

Q: What is scattering of light?

A: The absorption light by the particles in the medium through which light passes id called Scattering ...

Q: Can an object move along a curved path if no force acts on it? Defend your answer.

A: No, an object cannot move along a curved path if no force acts on it.

Q: Each of two parallel wires separated by 8.0 mm carries a 20-A current. These two currents are opposi...

A: Answer is option (e)

Q: Define tunneling effect.

A:

Q: A 100 W electric bulb is used for 10 hours a day. How many units of energy are consumed in 30 days?

A: The total power consumed by a bulb,

Q: A spherical mirror and a thin spherical lens have each a focal length of –15 cm. The mirror and the ...

A:

Q: What is the speed acquired by a freely falling object 5 s after being dropped from a rest position? ...

A:

Q: What is the role of the split ring in an electric motor?

A: Split ring is containing a simple ring or cylindrical shell. This shell or ring split axially to mak...

Q: Why is the tungsten used almost exclusively for filament of electric lamps?

A: In most of the electric bulbs and lamps tungsten is used as filament. The main reason is high meltin...

Q: Thanks for your help.

A: The initial height is 50m, the angle of inclination is  10 degree, and thrust is 190N. The combined ...

Q: What happens to the image distance in the eye when we increase the distance of an object from the ey...

A: The image distance in the eye does not change if the distance of an object from the eye is increased...

Q: Explain working of solar cooker. Also draw its diagram.

A: A solar cooker is a device that is used to make the food with the help of solar energy. In solar coo...

Q: What Aristotelian idea did Galileo demolish with his experiments with inclined planes?

A:

Q: The rope of Exercise, is repositioned as shown and still supports the 50-N lantern. Is the tension i...

A:

Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.