Pearson IIT Foundation Series Physics Class 10 6th. Edition by Trishna Knowledge Systems | 9789332579033 | 9332579032 | Holooly

Pearson IIT Foundation Series Physics Class 10

562 SOLVED PROBLEMS

A body is projected vertically upward. Show that the (i) distance covered by it in the first ‘n’ seconds of ascent is equal to the distance covered by it in the first ‘n’ seconds of its descent. (ii) the distance covered by it in the last ‘n’ seconds of ascent is equal to the distance covered by it ...

Verified Answer:

(i) Find the velocity v1 of a body projected upwar...

Question: 5.C-A.53

An ice cube, having a stone of 500 g placed on its top, is floating in water with its lateral sides placed vertically. It displaces 5 kg of water. Suddenly, the stone slips into water. Because of this ice cube rises by 1 / 10 th of its length above the water level. What is the density of the ice ...

Verified Answer:

(i) By the law of floatation, mass of cube (ice) +...

Question: 11.C-A.72

Find the energy dissipated in 10 minutes in the diode in the circuit shown above. The barrier potential across a diode is 0.7 V which remains constant. (Assume the diode to be ideal) ...

Verified Answer:

The PD across the diode is 0.7 V. The remaining vo...

Question: 11.C-A.71

Calculate the current through the following circuits. (The diodes are ideal) ...

Verified Answer:

(a) In the circuit, the diode

D_{1}[/latex...

Question: 11.C-A.70

In a n-p-n transistor circuit, the collector current is 9.9 mA. If 90% of the electrons emitted reach the collector, find out the value of emitter current and base current. ...

Verified Answer:

I_{ e }=I_{ b }+I_{ c }

Here colle...

Question: 11.C-A.69

In an oscilloscope, the cathode emits the electrons which are accelerated by the anodes. Explain the kind of voltages to be applied to the horizontal and vertical plates so that images formed on the defl ecting screen are (a) horizontal line (b) vertical line ...

Verified Answer:

(a) To get horizontal line on the screen, an AC vo...

Question: 11.C-A.68

In a vacuum diode, some of the electrons possessing suffi cient kinetic energy can reach the plate even if the plate potential is negative. For a certain diode, the plate current becomes zero when plate potential is –10 V. What is the kinetic energy of the electrons in eV, if the plate potential ...

Verified Answer:

The plate current is zero when the electrons are c...

Question: 11.C-A.67

Electrons emitted from the surface of a cathode have sufficient kinetic energy to reach the anode even if the anode is at a negative potential. In a vacuum diode, no current flows when the anode potential is less than –5 V. Find the maximum kinetic energy of the electrons in electron volt, ...

Verified Answer:

(i) Minimum negative potential required to stop th...

Question: 11.C-A.66

A graph of vacuum diode current I, is plotted against the anode voltage, VP for two different temperatures T1 and T2 (T2 > T1) of the cathode, as shown in the figure below. (1) For the same anode voltage, (called plate voltage) why is the current more when the cathode temperature changes from T1 ...

Verified Answer:

(i) As the temperature of the cathode increases, i...

Question: 11.C-A.65

In the circuit diagram shown below, explain the voltage across R. The sinusoidal voltage has a peak value of 200 V and the capacitor used has long charging time. Assume the diode to be an ideal diode. ...

Verified Answer:

The capacitor charges to peak AC voltage during po...

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