Q.1The plant harmone which inhibits the growth in unfavourable
conditions is _____________
Q.2) The unit of specific resistance is _____________
Q.3) The fixed resistance is called ______________
Q.4) SI unit of magnetic field is _______________
Q.5) A coil carrying current behaves as a/an ___________
Q.6) We suddenly withdraw our hands when a pin pricks.Name
the type of response involved in this action.
Q.7) Name two receptors .
Q.8) The length of a wire is doubled . How is its resistivity
affected ?
Q. Which has higher resistance :- a bulb of 50 W or of 25 W
Q. Write any one property of magnetic field lines .
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Q.1The plant harmone which inhibits the growth in unfavourable
conditions is Abscisic acid
Q.2) The unit of specific resistance is ohm-meter
Q.3) The fixed resistance is called Rheostat
Q.4) SI unit of magnetic field is teslas
Q.5) A coil carrying current behaves as a/an solenoid
Q.6) We suddenly withdraw our hands when a pin pricks.Name
the type of response involved in this action.
It is the type of reflex actionwhich is involuntary and spontaneous. This type ofactions are not under the control of our will.
Q.7) Name two receptors .
Receptors are protein molecules in the target cell or on its surface that bind ligands. There are two types of receptors: internal receptors and cell-surface receptors.
Q.8) The length of a wire is doubled . How is its resistivity affected ?
Q. Which has higher resistance :- a bulb of 50 W or of 25 W
Q. Write any one property of magnetic field lines .
The electrical resistance of a wire would be expected to be greater for a longer wire, less for a wire of larger cross sectional area, and would be expected to depend upon the material out of which the wire is made.The resistance of a wire can be expressed as R=ρAL,
where,
ρ - Resistivity - the factor in the resistance which takes into account the nature of the material is the resistivity
L - Length of the conductor
A - Area of cross section of the conductor.
From this relation, we observe that the length is directly proportional to the resistance and the area of cross section is inversely proportional to the resistance.
That is, if L becomes 2 L, R becomes 2 R. R′=ρA2L. So, R = 2R'.
Hence, If the length of a wire is doubled, then its resistance becomes 2 times.
conditions is Abscisic acid
Q.2) The unit of specific resistance is ohm-meter
Q.3) The fixed resistance is called Rheostat
Q.4) SI unit of magnetic field is teslas
Q.5) A coil carrying current behaves as a/an solenoid
Q.6) We suddenly withdraw our hands when a pin pricks.Name
the type of response involved in this action.
It is the type of reflex actionwhich is involuntary and spontaneous. This type ofactions are not under the control of our will.
Q.7) Name two receptors .
Receptors are protein molecules in the target cell or on its surface that bind ligands. There are two types of receptors: internal receptors and cell-surface receptors.
Q.8) The length of a wire is doubled . How is its resistivity affected ?
Q. Which has higher resistance :- a bulb of 50 W or of 25 W
Q. Write any one property of magnetic field lines .
The electrical resistance of a wire would be expected to be greater for a longer wire, less for a wire of larger cross sectional area, and would be expected to depend upon the material out of which the wire is made.The resistance of a wire can be expressed as R=ρAL,
where,
ρ - Resistivity - the factor in the resistance which takes into account the nature of the material is the resistivity
L - Length of the conductor
A - Area of cross section of the conductor.
From this relation, we observe that the length is directly proportional to the resistance and the area of cross section is inversely proportional to the resistance.
That is, if L becomes 2 L, R becomes 2 R. R′=ρA2L. So, R = 2R'.
Hence, If the length of a wire is doubled, then its resistance becomes 2 times.
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