hey mates need help
please answer all questions
Answers
Heya user..!!
Here is ur answer....!!
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SECTION - A
Q1 ans : Sunflower , Lily , Hibiscus etc.. is an example of a flower which contains both, stamen and carpel.
Q2 ans : Pepsin : Enzymes that breakdown the proteins.
Trypsin : It digests the proteins.
Q3 ans : Given : Mass number of element is 35
Number of neutrons= 18
Mass number = number of protons + number of neutrons.
35=× +18
×=35 - 18
X=17.
So, atomic number of X is 17.
Electronic configuration of X : 2,8,7
Group number= 17
Period number =3
Valency =1
Q4 ans : Given:
Focal length (f)= -20 cm
Image distance (v)= -60cm
Height of the object = 1.2cm ( h ₁ )
By Mirror Formula :
1/v + 1/u = 1/f
1/v + 1/u = 1/f
(-1/60)+(1/u) = (-1/20)
1/u= -1/20 + 1/60
1/u = (-3+1)/60= -2/60= -1/30
1/u= -1/30
u = -30
Object distance= -30 cm
Magnification = -v/u
m = - (-60) /-30= 60/-30= -2
m = h2/h1
-2= h2/1.2
-2×1.2= h2
∴ h₂= -2.4 cm
So , Height of real image (h2)= -2.4 cm
Q5 ans :
1. Our demand for energy is increasing to improve quality of life and growth of population
2. Fossil fuels are limited
Q6 ans : Generator
Principle : It works based on principle of faraday law of electromagnetic induction.
Diagram is below my full answer's check it..!!
Q7 ans : Maximum power of each resistor is 16W
4Ω resistor is joined in series with circuit .
so, Power = i² R , here i is current through resistor of resistance R
16 = i² × 4Ω
i = 2A
Now, 2A is passing through parallel resistors of resistance 8Ω.
we know, in parallel potential difference be constant
so, current divides two part , due to same resistance current on each resistance will be half . so, current passing through each parallel resistor is 2/2A = 1A
So, finally current through 4Ω resistor = 2A
current through each 8Ω resistor = 1A
Q8 ans : a) The gas is collected at cathode is Hydrogen , H₂
And the gas collected at anode is oxygen ,O₂
b) The volume of hydrogen gas collected at cathode is more than volume of oxygen gas at anode because water is made up of 2 parts of hydrogen and 1 part of oxygen by volume.
c) If dil.H2SO4 is added to water then the rate of electrolysis increases.
Q9 ans : Mendeleev's periodic table :
1) It has 8 groups and 6 periods.
2) Transition elements are not separated.
3) The inert gases were not present .
Modern Periodic Table :
1) It has 18 groups and 7 periods.
2) Transition elements are given separated place.
3) The inert gases were present in separate group..
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I Hope this may help u..!!
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