During mean life of a radioactive element, the fraction that disintegrates is
Options
(a) e (b) 1/e (c) (e-1)/e (d) e/(e-1)
Correct Answer:
(e-1)/e
Explanation:
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Dimensions [ML⁻¹T⁻¹] are related with
Options
(a) Work (b) Torque (c) Energy (d) Coefficient of viscocity
Correct Answer:
Coefficient of viscocity
Explanation:
The coefficient of viscosity F=ηA(dV/dx) η=F/A(dV/dx) =MLT⁻²/[L²T⁻¹] η=[ML⁻¹T⁻¹].
If the wavelength of light in vacuum be, the wavelength in a medium of refractive index µ will be
Options
(a) µλ (b) λ / µ (c) λ / µ² (d) µ²λ
Correct […]
Two charges each equal to 2µ C are 0.5m apart. If both of them exist inside vacuum, then the force between them is
Options
(a) 1.89 N (b) 2.44 N (c) 0.144 N […]
In P-N junction having depletion layer of thickness 10⁻⁶ m, the potential across it is 0.1 V. The electric field is
Options
(a) 10⁷ (b) 10⁻⁶ (c) 10⁵ (d) 10⁻⁵
Correct Answer:
10⁵
An electric current passes through a long straight wire. At a distance 5 cm from the wire, the magnetic field is B. The field at 20 cm from the wire would be
Options
A 1 kg particle strikes a wall with velocity 1 m/s at an angle 30° and reflects at the same angle. If it remains contact with wall for 0.1 sec, then the force is
Which will show geometrical isomerism
Options
(a) (CH₃)₂C=C(CH₃)₂ (b) CH₃HC=CHCH₃ (c) (CH₃)₂C=CH₂ (d) CH₂=CH₂
Correct Answer:
CH₃HC=CHCH₃
Explanation:
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Velamen is found in
Options
(a) ferns (b) halophytes (c) orchids (d) gymnosperms
Correct Answer:
orchids
Explanation:
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In phylum protozoa, the class of total parasite is
Options
(a) mastigophora (b) ciliata (c) sporozoa (d) sarcodina
Correct Answer:
sporozoa
Explanation:
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