During negative β-decay
Options
(a) Neutron converts into proton (b) Proton converts into neutron (c) Neutron proton ratio increases (d) None of these
Correct Answer:
Neutron converts into proton
Explanation:
No explanation available. […]
In atom bomb, the reaction which occurs is
Options
(a) fusion (b) controlled fission (c) uncontrolled fission (d) thermonuclear
Correct Answer:
uncontrolled fission
Explanation:
No explanation available. Be the first to write the […]
1 curie is equal to
Options
(a) 3×10¹⁰ disintegrations/sec (b) 3.7×10⁷ disintegrations/sec (c) 5×10⁷ disintegrations/sec (d) 3.7×10¹⁰ disintegrations/sec
Correct Answer:
3.7×10¹⁰ disintegrations/sec
Explanation:
No explanation available. Be the first to write the explanation […]
A nucleus ᵐₙ X emits one α- particle and two β- particles. The resulting nucleus is
Options
(a) ᵐ⁻⁶ₙ₋₄ Z (b) ᵐ⁻⁶ₙ Z (c) ᵐ⁻⁴ₙ X (d) ᵐ⁻⁴ₙ₋₂ Y
Correct Answer:
ᵐ⁻⁴ₙ X
Magnetism of a magnet is due to
Options
(a) Cosmic rays (b) Large magnet at the centre of Earth (c) Spins of electrons (d) Gravitation
Correct Answer:
Spins of electrons
Explanation:
Spins of electrons […]
Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show
Options
(a) anti ferromagnetism (b) no magnetic property (c) diamagnetism (d) paramagnetism
Correct Answer: […]
Two particles A and B having equal charges, after being accelerated through the same potential difference enter into a region of uniform magnetic field and the particles describe circular paths of radii R₁ and R₂, […]
If the magnetising field on a ferromagnetic material is increased, its permeability
Options
(a) decrease (b) increase (c) is unaffected (d) may be increase or decrease
Correct Answer:
decrease
Explanation:
Magnetic permeability of substance, […]
The dimensions of magnetic field intensity B are
Options
(a) MLT⁻²A⁻¹ (b) MT⁻²A⁻¹ (c) ML²TA⁻² (d) M²LT⁻²A⁻¹
Correct Answer:
MT⁻²A⁻¹
Explanation:
Dimensions of B = [MT⁻²A⁻¹] F = Bil sin θ [MLT⁻²] = [B] […]
Core of electromagnets are made of ferromagnetic material which has
Options
(a) low permeability and high retentivity (b) high permeability and low retentivity (c) low permeability and low retentivity (d) high premeability and […]
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