A cylindrical tank is filled with water to a level of 3m. A hole is opened at a height
A cylindrical tank is filled with water to a level of 3m. A hole is opened at a height of 52.5 cm from bottom. The ratio of the area of the hole to that at […]
Physics
If two soap bubbles of different radii are connected by a tube
If two soap bubbles of different radii are connected by a tube
Options
(a) Air flows from the bigger bubble to the smaller bubble till the sizes become equal (b) Air flows from the […]
Application of Bernoulli’s theorem can be seen in
Application of Bernoulli’s theorem can be seen in
Options
(a) Dynamic lift of aeroplane (b) Hydraulic press (c) Helicopter (d) None of these
Correct Answer:
Dynamic lift of aeroplane
Explanation:
No explanation available. Be […]
The temperature of a metal block is increased from 27⁰C to 84⁰C. The rate of radiated energy
The temperature of a metal block is increased from 27⁰C to 84⁰C. The rate of radiated energy from the block will increase approximately
Options
(a) 2 times (b) 4 times (c) 8 times (d) […]
Radius of a soap bubble is increased from R to 2R. Work done in this process
Radius of a soap bubble is increased from R to 2R. Work done in this process in terms of surface tension S is
Options
(a) 24 πR²S (b) 48 πR²S (c) 12 πR²S (d) […]
Two bubbles A and B (A>B) are joined through a narrow tube. Then
Two bubbles A and B (A>B) are joined through a narrow tube. Then
Options
(a) The size of A will increase (b) The size of B will increase (c) The size of B will […]
The earth radiates in the infrared region of the spectrum. The spectrum is correctly
The earth radiates in the infrared region of the spectrum. The spectrum is correctly given by
Options
(a) Wien’s law (b) Rayleigh Jean’s law (c) Planck’s law of radiation (d) Stefen’s law
Correct Answer: […]
Consider a compound slab consisting of two different materials having equal thickness
Consider a compound slab consisting of two different materials having equal thickness and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is
Options
(a) √2K (b) 3K (c) 4K/3 […]
Young’s modulus of perfectly rigid body material is
Young’s modulus of perfectly rigid body material is
Options
(a) Zero (b) Infinity (c) 1×10¹⁰ N/m² (d) 10×10¹⁰ N/m²
Correct Answer:
Infinity
Explanation:
No explanation available. Be the first to write the explanation for […]
A wire of length 2 m is made from 10 cm³ of copper. A force F is applied so that
A wire of length 2 m is made from 10 cm³ of copper. A force F is applied so that its length increases by 2 mm. Another wire of length 8 m is made from […]