Explain the process of synthesis of food in green plants.
The process by which plants make food is named photosynthesis. Photosynthesis is the process in which green plants use sunlight... View Article
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In a reaction, 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium ethanoate. Show that these observations are in agreement with the law of conservation of mass. sodium carbonate + ethanoic acid → sodium ethanoate + carbon dioxide + water.
In the given reaction, sodium carbonate reacts with ethanoic acid to produce sodium ethanoate, carbon dioxide, and water sodium carbonate... View Article
On a hot day, Aslam takes a bottle of cold-drink from the refrigerator and places it on a table. Within minutes, some drops of water appear on the outer surface of the bottle. As the water drops accumulate, they trickle down the surface of the bottle. Name the processes of the water cycle that are demonstrated in the events observed by Aslam.
Answer: The process by which water vapour is cooled into water is called condensation. The temperature outside the refrigerator is... View Article
Smita studied about the Modern Periodic Table. She placed hydrogen, lithium, sodium, and calcium in the same group in the periodic table. However, her teacher told her that she has placed one element incorrectly in the periodic table.(Atomic numbers of H, Li, Na, and Ca are 1, 3, 11, and 20 respectively) Which element has been placed incorrectly by Smita?
Elements containing same number of valence electrons are present in the same group of the modern periodic table. The number... View Article
How would these advantages differ from the advantages of using a long-term perspective in managing our resources?
If resources are used in accordance with short term aims, the present generation will be able to utilize the resources... View Article
Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.
Inside the loop = Pierce inside the table Outside the loop = Appear to emerge out from the table For... View Article
What are the different ways in which individuals with a particular trait may increase in a population?
An individual trait may increase in a population in the following ways The trait is beneficial to the population: if... View Article
In the case of real gases, the equation of state, PV = RT (where P, V and T are respectively the pressure, volume and absolute temperature), is strictly satisfied only if corrections are applied to the measured pressure P and the measured volume V. When does the corrections for P and V arise?
In kinetic theory of gases it is assumed that there is no force between molecules But there is actually intermolecular... View Article
Give two reasons to justify: a) Water at room temperature is a liquid. b) An iron almirah is a solid at room temperature.
a) Water at room temperature is a liquid. Water at room temperature is liquid due to the presence of hydrogen... View Article
Which hormone causes dilation of blood vessels, increased oxygen consumption and glucogenesis? a)Adrenaline b)Serotonin c)Insulin d)Thyroid
Adrenaline is secreted by the adrenal medulla. It mainly acts on smooth muscles, cardiac muscles, blood vessels, skeletal muscles and... View Article
A scooter waiting on a signal has its mirror vibrating violently. Why?
This is because of resonance. When a body is subjected to forced vibration with a frequency which equal to or... View Article
Name the physical quantity which we get from a S-t graph.
Speed-Time Graphs look much like Distance-Time graph. Time is plotted on the X-axis. Speed or velocity is plotted on the... View Article
In the following example, try to identify the number of times the velocity of the ball changes: “A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team”. Also identify the agent supplying the force in each case.
The velocity of football changes four times. First, when a football player kicks to another player, second when that player... View Article
Why is it difficult to hold a school bag having a strap made of a thin and strong string?
It is difficult to hold a school bag having a thin strap because the pressure on the shoulders is quite... View Article
What is an induced movement?
Induced movement or induced motion is an illusion of visual perception in which a stationary or a moving object appears... View Article
Which of the following molecules show the presence of intramolecular hydrogen bonding? (a) Cellulose (b) HCN (c) Concentrated Acetic Acid (d) H2O2
Option (a) Cellulose Cellulose shows the presence of intra molecule hydrogen bonding in them. This is due to the fact... View Article
Newton’s first law of motion is also known as the law of__________
Answer: Newton’s first law of motion is also known as the law of inertia. Newton’s first law of motion Newton’s first... View Article
Two identical metallic spheres, having unequal opposite charges are placed at a distance of 0.90 m apart. After bringing them in contact with each other, they again placed at the same distance apart. Now the force of repulsion between them is 0.025 N. Calculate the final charge on each of them.
Let the initial charges be q1 and q2 respectively. After they come in contact, the charges are rearranged such that... View Article
A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
The ray of light bends towards the normal. Solution The light ray bends towards the normal. When a light ray... View Article
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
Answer: Given parameters Potential difference (V) = 220 V Power of lamp 1 (P1) = 100 W Power of lamp... View Article
