In Young’s double slit experiment, the locus of the point P lying in a plane with a constant path difference between two interfering waves is
Options
(a) a hyperbola (b) a straight line […]
An experiment takes 10 minutes to raise temperature of water from 0⁰C to 100⁰C and another 55 minutes to convert it totally into stream by a stabilized heater. The latent heat of vapourization comes out […]
The dimensions of latent heat are
Options
(a) [M⁰L²T⁻²] (b) [M⁰L¹T⁻²] (c) [M²L⁰T⁻²] (d) [M⁰L⁻²T⁻²]
Correct Answer:
[M⁰L²T⁻²]
Explanation:
No explanation available. Be the first to write the explanation for this question by […]
A thin equiconvex lens of refractive index 3/2 and radius of curvature 30 cm is put in water (refractive index = 4/3) , its focal length is
Options
(a) 0.15 m (b) 0.30 […]
An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp image is formed on a screen. Now, a concave lens is placed in contact with the […]
A radioactive element forms its own isotope after 3 consecutive disintegrations. The particle emiited are
Options
(a) 3 β-particles (b) 2 β-particles and 1 α-particle (c) 2 β-particles and 1 γ-particle (d) 2 […]
Given a sample of radium-226 having half-life of 4 days. Find the probability, a nucleus disintegrates after 2 half-lives.
Options
(a) 1 (b) (1/2) (c) 1.5 (d) (3/4)
Correct Answer:
(3/4)
Explanation:
No […]
Eight drops of a liquid of density ρ and each of radius a are falling through air with a constant velocity 3.75 cms⁻¹. When the eight drops coalesce to from a single drop the terminal […]
Perfectly black body radiates the energy 18 J/s at 300K. Another ordinary body of e=0.8 having same are at 500K will radiate
Options
(a) 111 J/s (b) 421 J/s (c) 321 J/s (d) […]
A black body is at 727⁰C. It emits energy at a rate which is proportional to
Options
(a) (1000)⁴ (b) (1000)² (c) (727)⁴ (d) (727)²
Correct Answer:
(1000)⁴
Explanation:
According to Stefan’s law, E […]
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