WB JEE 2008 | Properties of Matter Question 2 | Physics

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WB JEE 2008

MCQ (Single Correct Answer)

-0.25

A wire is stretched under a force. If the wire suddenly snaps the temperature of the wire

remains the same

decreases

increases

first decreases then increases

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

A beaker of radius 15 cm is filled with a liquid of surface tension 0.075 N/m. Force across an imaginary diameter on the surface of the liquid is

0.075 N

1.5 $$\times$$ 10^$$-$$2 N

0.225 N

2.25 $$\times$$ 10^$$-$$2 N

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

A piece of wood is floating in water. When the temperature of water rises, the apparent weight of the wood will

increase

decrease

may increase or decrease

remain same

WB JEE 2026

MCQ (Single Correct Answer)

-0.25

A body of density＇$\rho$＇is dropped slowly on the surface of a lake of depth $d$ ．If the density of the lake water be＇$\rho^{\prime \prime}\left(\rho^{\prime}<\rho\right)$ then the time taken by the body to reach the bottom of the lake is ‘

$\left[\frac{2 d \rho}{g\left(\rho-\rho^{\prime}\right)}\right]^{\frac{1}{2}}$

$\left[\frac{2 g d}{\rho\left(\rho-\rho^{\prime}\right)}\right]^{\frac{1}{2}}$

$\left[\frac{2 d \rho^{\prime}}{\rho g\left(\rho-\rho^{\prime}\right)}\right]^{\frac{1}{2}}$

$\left[\frac{g\left(\rho-\rho^{\prime}\right)}{2 d \rho}\right]^{\frac{1}{2}}$

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