JEE Main Physics Express>Chapter -1 - Modern Physics>Exercise>Q 12

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Earn 100

The decay of a proton to neutron is :

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Questions featured in Previous Year Papers on Modern Physics

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JEE Main Physics Express>Chapter -1 - Modern Physics>Exercise>Q 41

A zener diode of power rating $2 W$ is to be used as a voltage regulator. If the zener diode has a breakdown of $10 V$ and it has to regulate voltage fluctuated between $6 V$ and $14 V$ , the value of $R_{s}$ for safe operation should be _____ $Ω$ .

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JEE Main Physics Express>Chapter -1 - Modern Physics>Exercise>Q 40

An antenna is mounted on a

400 m

tall building. What will be the wavelength of signal that can be radiated effectively by the transmission tower upto a range of

44 km

?

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JEE Main Physics Express>Chapter -1 - Modern Physics>Exercise>Q 39

For a transistor

α

and

β

are given as

α = \frac{I_{C}}{I_{E}}

and

β = \frac{I_{C}}{I_{B}}

. Then the correct relation between

α

and

β

will be:

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JEE Main Physics Express>Chapter -1 - Modern Physics>Exercise>Q 44

If the sum of the heights of transmitting and receiving antennas in the line of sight of communication is fixed at

160 m,

then the maximum range of LOS communication is _______

km

(Take radius of Earth

= 6400 km

)

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JEE Main Physics Express>Chapter -1 - Modern Physics>Exercise>Q 38

A transmitting antenna has a height of

320 m

and that of receiving antenna is

2000 m .

The maximum distance between them for satisfactory communication in line of sight mode is

d

. The value of

d

is ________

km .

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JEE Main Physics Express>Chapter -1 - Modern Physics>Exercise>Q 37

A circuit is arranged as shown in figure. The output voltage $V_{o}$ is equal to __________ $V .$

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JEE Main Physics Express>Chapter -1 - Modern Physics>Exercise>Q 36

For a transistor in CE mode to be used as an amplifier, it must be operated in:

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JEE Main Physics Express>Chapter -1 - Modern Physics>Exercise>Q 35

For the given circuit, the power across zener diode is _____ $mW$ .

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