ChemistryQ51–54 of 71 questions
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51
ChemistryMCQAIPMT · 1995
The functional kidney of a frog tadpole is:
A
Archinephros
B
Pronephros
C
Mesonephros
D
Metanephros
Solution
(B) The kidney of a frog tadpole is $Pronephros$.
In adult amphibians,the kidney is $Mesonephros$.
In contrast,birds and mammals possess a $Metanephros$ type of kidney.
In adult amphibians,the kidney is $Mesonephros$.
In contrast,birds and mammals possess a $Metanephros$ type of kidney.
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52
ChemistryMCQAIPMT · 1995
The functional kidney of a frog tadpole is:
A
Archinephros
B
Pronephros
C
Mesonephros
D
Metanephros
Solution
(B) The pronephric kidney is the most primitive type of kidney found in vertebrates.
It opens directly into the body cavity,and its functional units are ciliated funnels known as nephrostomes.
This type of kidney is functional in the larval stages of amphibians,such as the tadpole of a frog.
It opens directly into the body cavity,and its functional units are ciliated funnels known as nephrostomes.
This type of kidney is functional in the larval stages of amphibians,such as the tadpole of a frog.
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53
ChemistryMCQAIPMT · 1995
If we completely remove the decomposers from an ecosystem,its functioning will be adversely affected because
A
Herbivores will not receive solar energy
B
Mineral movement will be blocked
C
The rate of decomposition will be very high
D
Energy flow will be blocked
Solution
(B) Decomposers (saprotrophs) play a crucial role in the ecosystem by breaking down complex organic matter into simpler inorganic substances.
This process,known as decomposition,releases nutrients back into the soil,making them available for uptake by producers (plants).
If decomposers are removed,the recycling of nutrients (mineral cycling) stops.
As a result,the soil becomes depleted of essential minerals,preventing producers from growing,which eventually leads to the collapse of the entire ecosystem.
Therefore,the movement of minerals is blocked.
This process,known as decomposition,releases nutrients back into the soil,making them available for uptake by producers (plants).
If decomposers are removed,the recycling of nutrients (mineral cycling) stops.
As a result,the soil becomes depleted of essential minerals,preventing producers from growing,which eventually leads to the collapse of the entire ecosystem.
Therefore,the movement of minerals is blocked.
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54
ChemistryMCQAIPMT · 1995
In an $AC$ circuit,the current is given by $i = 5 \sin(100t - \frac{\pi}{2}) \text{ A}$ and the $AC$ potential is $V = 200 \sin(100t) \text{ V}$. Then the power consumption is $....$ watt.
A
$20$
B
$40$
C
$1000$
D
$0$
Solution
(D) The instantaneous power in an $AC$ circuit is given by $P = V_{rms} I_{rms} \cos \phi$,where $\phi$ is the phase difference between voltage and current.
Given voltage $V = 200 \sin(100t)$ and current $i = 5 \sin(100t - \frac{\pi}{2})$.
The phase of voltage is $\phi_V = 100t$ and the phase of current is $\phi_i = 100t - \frac{\pi}{2}$.
The phase difference $\phi = \phi_V - \phi_i = 100t - (100t - \frac{\pi}{2}) = \frac{\pi}{2}$.
The power consumption is $P = V_{rms} I_{rms} \cos(\frac{\pi}{2})$.
Since $\cos(\frac{\pi}{2}) = 0$,the power consumption $P = 0 \text{ W}$.
Given voltage $V = 200 \sin(100t)$ and current $i = 5 \sin(100t - \frac{\pi}{2})$.
The phase of voltage is $\phi_V = 100t$ and the phase of current is $\phi_i = 100t - \frac{\pi}{2}$.
The phase difference $\phi = \phi_V - \phi_i = 100t - (100t - \frac{\pi}{2}) = \frac{\pi}{2}$.
The power consumption is $P = V_{rms} I_{rms} \cos(\frac{\pi}{2})$.
Since $\cos(\frac{\pi}{2}) = 0$,the power consumption $P = 0 \text{ W}$.
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