361297
A disc of paper of radius \(R\) has a hole of radius \(r\). It is floating on a liquid of surface tension \(T\). The force of surface tension on the disc is
1 \(T .3 \pi R\)
2 \(T .4 \pi(R+r)\)
3 \(T .2 \pi(R+r)\)
4 \(T .2 \pi(R-r)\)
Explanation:
Effective length \(=2 \pi r+2 \pi R\). The surface tension force is \(F=T 2 \pi(r+R)\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361298
A square frame of side \(L\) is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is \(T\), the force acting on the frame will be
1 \(2 T L\)
2 \(4 T L\)
3 \(8 T L\)
4 \(10 T L\)
Explanation:
Force on each side \(=2 T L\) [due to two surfaces] \(\therefore\) Force on the frame \(=4(2 T L)=8 T L\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361299
If the temperature increases, the surface tension of a liquid
1 Decreases
2 Increases
3 Remains a constant
4 First increases then decreases
Explanation:
The surface tension of a liquid decreases with the rise in temperature and it disappears a few degrees below the critical temperature. So correct option is (1)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361300
The spiders and insects move and run on the surface of water without sinking because
1 Elastic membrane is formed on water due to property of surface tension
2 Spiders and insects are lighter
3 Spider and insects experience upthrust
4 Spiders and insects swim on water
Explanation:
Weight of spiders or insects can be balanced by vertical component of force due to surface tension.
NEET Test Series from KOTA - 10 Papers In MS WORD
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PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361297
A disc of paper of radius \(R\) has a hole of radius \(r\). It is floating on a liquid of surface tension \(T\). The force of surface tension on the disc is
1 \(T .3 \pi R\)
2 \(T .4 \pi(R+r)\)
3 \(T .2 \pi(R+r)\)
4 \(T .2 \pi(R-r)\)
Explanation:
Effective length \(=2 \pi r+2 \pi R\). The surface tension force is \(F=T 2 \pi(r+R)\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361298
A square frame of side \(L\) is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is \(T\), the force acting on the frame will be
1 \(2 T L\)
2 \(4 T L\)
3 \(8 T L\)
4 \(10 T L\)
Explanation:
Force on each side \(=2 T L\) [due to two surfaces] \(\therefore\) Force on the frame \(=4(2 T L)=8 T L\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361299
If the temperature increases, the surface tension of a liquid
1 Decreases
2 Increases
3 Remains a constant
4 First increases then decreases
Explanation:
The surface tension of a liquid decreases with the rise in temperature and it disappears a few degrees below the critical temperature. So correct option is (1)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361300
The spiders and insects move and run on the surface of water without sinking because
1 Elastic membrane is formed on water due to property of surface tension
2 Spiders and insects are lighter
3 Spider and insects experience upthrust
4 Spiders and insects swim on water
Explanation:
Weight of spiders or insects can be balanced by vertical component of force due to surface tension.
361297
A disc of paper of radius \(R\) has a hole of radius \(r\). It is floating on a liquid of surface tension \(T\). The force of surface tension on the disc is
1 \(T .3 \pi R\)
2 \(T .4 \pi(R+r)\)
3 \(T .2 \pi(R+r)\)
4 \(T .2 \pi(R-r)\)
Explanation:
Effective length \(=2 \pi r+2 \pi R\). The surface tension force is \(F=T 2 \pi(r+R)\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361298
A square frame of side \(L\) is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is \(T\), the force acting on the frame will be
1 \(2 T L\)
2 \(4 T L\)
3 \(8 T L\)
4 \(10 T L\)
Explanation:
Force on each side \(=2 T L\) [due to two surfaces] \(\therefore\) Force on the frame \(=4(2 T L)=8 T L\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361299
If the temperature increases, the surface tension of a liquid
1 Decreases
2 Increases
3 Remains a constant
4 First increases then decreases
Explanation:
The surface tension of a liquid decreases with the rise in temperature and it disappears a few degrees below the critical temperature. So correct option is (1)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361300
The spiders and insects move and run on the surface of water without sinking because
1 Elastic membrane is formed on water due to property of surface tension
2 Spiders and insects are lighter
3 Spider and insects experience upthrust
4 Spiders and insects swim on water
Explanation:
Weight of spiders or insects can be balanced by vertical component of force due to surface tension.
361297
A disc of paper of radius \(R\) has a hole of radius \(r\). It is floating on a liquid of surface tension \(T\). The force of surface tension on the disc is
1 \(T .3 \pi R\)
2 \(T .4 \pi(R+r)\)
3 \(T .2 \pi(R+r)\)
4 \(T .2 \pi(R-r)\)
Explanation:
Effective length \(=2 \pi r+2 \pi R\). The surface tension force is \(F=T 2 \pi(r+R)\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361298
A square frame of side \(L\) is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is \(T\), the force acting on the frame will be
1 \(2 T L\)
2 \(4 T L\)
3 \(8 T L\)
4 \(10 T L\)
Explanation:
Force on each side \(=2 T L\) [due to two surfaces] \(\therefore\) Force on the frame \(=4(2 T L)=8 T L\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361299
If the temperature increases, the surface tension of a liquid
1 Decreases
2 Increases
3 Remains a constant
4 First increases then decreases
Explanation:
The surface tension of a liquid decreases with the rise in temperature and it disappears a few degrees below the critical temperature. So correct option is (1)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361300
The spiders and insects move and run on the surface of water without sinking because
1 Elastic membrane is formed on water due to property of surface tension
2 Spiders and insects are lighter
3 Spider and insects experience upthrust
4 Spiders and insects swim on water
Explanation:
Weight of spiders or insects can be balanced by vertical component of force due to surface tension.
