Photon and electron are given same energy (10^‑20J). Wavelength associated with photon and electron are λ_p and λ_e, the correct statement will be

1. λ_p > λ_e

_2.λ_p < λ_e

_3.λ_p = λ_e

_4. = c

Subtopic: De-broglie Wavelength |

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The half life of radioactive elements is 600 yr the fraction of sample that would remain after 3000 yr is

1. 1/2

2. 1/16

3. 1/8

4. 1/32

Subtopic: Radioactivity |

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A particle moves along with x-axis. The position x os particles with respect to time t from origin given by x = b₀ + b₁t + b₂t². The acceletration of particle is

1. b₀

_2.b₁

_3.b₂

_4.2b₂

Subtopic: Acceleration |

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Root mean square speed of the molecules of ideal gas is v. If pressure is increased two times at constant temperature, then the rms speed will become

2. v

3. 2v

4. 4v

Subtopic: Types of Velocities |

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1 mol of gas occupies a volume of 200 mL at 100 mm pressure. What is the volume occupied by two moles of gas at 400 mm pressure and at same temperature?

1. 50 mL

2. 100 mL

3. 200 mL

4. 400 mL

Subtopic: Ideal Gas Equation |

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A charged particle travels along a straight line with a speed v in a region where both electric foeld E and magnetic field B are present. If follows that

1. |E| = v |B| and two fields are parallel

2. |E| = v |B| and two fields are perpendicular

3. |B| = v |E| and two fields are parallel

4. |B| = v |E| and two fields are perpendicular

Subtopic: Lorentz Force |

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What will be the wave velocity, if the radar gives 54 waves/min and wavelength of the given wave is 10 m?

1. 4 m/s

2. 6 m/s

3. 9 m/s

4. 5 m/s

Subtopic: Wave Motion |

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A transformer of 100% efficiency has 200 turns in the primary coil and 40000 turns in secondary coil. It is connected to a 220 V main supply and secondary feeds to a 100 kΩ resistance. The potential difference per turn is

1. 1.1 V

2. 25 V

3. 18 V

4. 11 V

Subtopic: Transformer |

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A thin convex lens of refractive index 1.5 has 20 cm focal length in air. If the lens is completely immersed in a liquid of refractive index 1.6, its focal length will be

1. -160 cm

2. - 100 cm

3. + 10 cm

4. +100 cm

Subtopic: Lens Makers' Formula |

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SI unit of permittivity is

1. C²m²N²

2. C²m^-2N^-1

3. C²m²N^-1

4. C^-1m²N^-2

Subtopic: Coulomb's Law |

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Photon and electron are given same energy (10^‑20J). Wavelength associated with photon and electron are λ_p and λ_e, the correct statement will be

1. λ_p > λ_e

_2.λ_p < λ_e

_3.λ_p = λ_e

_4. = c

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Photon and electron are given same energy (10‑20J). Wavelength associated with photon and electron are λp and λe, the correct statement will be 1. λp > λe 2. λp < λe 3. λp = λe 4. = c

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Photon and electron are given same energy (10^‑20J). Wavelength associated with photon and electron are λ_p and λ_e, the correct statement will be

1. λ_p > λ_e

_2.λ_p < λ_e

_3.λ_p = λ_e

_4. = c