The half life of radioactive isotope ‘X’ is 50 years. It decays to
The half life of radioactive isotope ‘X’ is 50 years. It decays to another element ‘Y’ which is stable. The two elements ‘X’ and ‘Y’ were found to be in the ratio of 1 : […]
AIPMT2011
A nucleus ᵐₙ X emits one α- particle and two β- particles. The resulting nucleus is
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
A planet moving along an elliptical orbit is closest to the sun at a distance of r₁
A planet moving along an elliptical orbit is closest to the sun at a distance of r₁. If v₁ and v₂ are the linear velocities at these points respectively then the ratio v₁ / v₂ […]
By what factor does the average velocity of a gaseous molecule increase
By what factor does the average velocity of a gaseous molecule increase when the temperature (in K) is doubled
Options
(a) 2 (b) 2.8 (c) 4 (d) 1.4
Correct Answer:
1.4
Explanation:
No […]
A solid compound XY has NaCl structure . If the radius of the cation is 100 pm,
A solid compound XY has NaCl structure . If the radius of the cation is 100 pm, the radius of the anion (Y⁻) will be
Options
(a) 275.1 pm (b) 322.5 pm (c) […]
Standard electrode potential for Sn⁴⁺/Sn²⁺ couple is +0.15 V and that for the
Standard electrode potential for Sn⁴⁺/Sn²⁺ couple is +0.15 V and that for the Cr³⁺/Cr couple is -0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will […]
Clemmensen reduction of a keton is carried out in the presence of
Clemmensen reduction of a keton is carried out in the presence of which of the following
Options
(a) Glycol with KOH (b) Zn-Hg with HCl (c) LiAlH₄ (d) H₂ and pt as catalyst
Which one of the following acts as a catalyst in bacterial cells?
Which one of the following acts as a catalyst in bacterial cells?
Options
(a) snRNA (b) hnRNA (c) 23S rRNA (d) 5S RNA
Correct Answer:
23S rRNA
Explanation:
No explanation available. Be the […]
Sound waves travel at 350m/s through a warm air and at 3500 m/s through brass
Sound waves travel at 350m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air
Options
(a) decreases […]
Two waves are represented by the equations y₁ = a sin (?t + kx + 0.57) m
Two waves are represented by the equations y₁ = a sin (?t + kx + 0.57) m and y₂ = a cos (?t + kx) m, where x is in meter and t in sec. […]