CBSE ADDA

HOTS Questions with Answer:   Magnetic Effects of Electric Currents Q1.On what factors does the magnetic field intensity at the centre of the circular coil carrying current  depend ? Answer: The magnetic field intensity at the centre of the circular coil is directly proportional to current and inversely proportional to radius of the coil. So, in both the cases ,that is, twice the current as well as half in radius, the magnetic field intensity gets doubled. The magnitude of the magnetic field (B) at the of the coil is: (i). directly proportional to the current (I) flowing it.       i.e.   B α I                           ① (ii). Inversely proportional to the radius (r) of the coil     i.e.  B α  1/r                               ② From ①, and  ② , we get               B α I/r Q2.State the principle used to determine the force experienced by a conductor carrying current in uniform magnetic field ? Answer: .Fleming’s Left Hand Rule-Stretch the first three fingers

10th Control and coordination The organ system in an animal that serves to coordinate and control the functioning  of all other organ systems in the body is known as nervous system. Nervous system works with the endocrine system to communicate, integrate and coordinate the functions of various organs and systems in our body and helps the body to respond to the external stimuli.  In humans, the nervous system has two main divisions: • The central nervous system (CNS) • The peripheral nervous system (PNS) The central nervous system consists of brain and spinal cord. It is regarded as the ‘thinker’ or ‘information processor’ in the body. The peripheral nervous system includes the sensory and motor nerves and connects the central nervous system with the sense organs, muscles and glands of the body. The peripheral nervous system is regarded as ‘actor’ or ‘performer’ in the body. Nerve cell or neuron A neuron is the basic unit of nervous tissue. Our nervous

Question:  How does baking powder differ from baking soda? Answer:  Baking soda is a single compound which has sodium hydrogen carbonate which is  alkaline (basic) in nature Baking powder  is a mixture of sodium hydrogencarbonate and a mild edible(eatable) acid such as tartaric acid. When baking powder mixes with water, then the sodium hydrogencarbonate reacts with tartaric acid to evolve carbon dioxide gas which gets trapped in the wet dough and bubbles out slowly making the cake to rise and hence 'soft and spongy'.The equation which takes place can be shown as: NaHCO 3  + H +   ----> Na +  +  CO 2  + H 2 O Question:  What will happen if heating is not controlled while preparing Plaster of Paris from gypsum? Answer:  It may be noted that the temperature should be controlled carefully. It should not be allowed to rise above 152°C (425K) because, if whole of the water is lost then anhydrous calcium sulphate is produced, which is called dead burnt plaster and it

Class 10 Trendsetter solved CBSE Test paper-02 1. What is a neuron? (1 mark) Ans: Neuron is the structural &functional unit of nervous system. 2. Give an example of plant hormone that promotes growth. (1 mark) Ans: auxins, gibberellins and cytokinins 3. What part of the brain maintains posture and equilibrium of the body? (1 mark) Ans: Cerebellum controls coordination and adjustment of movements (equilibrium) and posture 4. Which parts of the body produce growth regulators? (1 mark) Ans: Pituitary Gland 5.What is synapse ? Ans: The junction between neurons is called synapse. 5. List two functions performed by ovaries in a human female. (1 mark) Ans: (a) Produces ova or egg. (b) Hormones Oestrogen and Progesterone. 6. What does a stem (or shoot) do in a response to light? (1 mark) Ans: The stem is positively phototropic (grown towards light) 7. Name the 2 hormones secreted by pancreas. Write one function of each hormone. (2 marks) Ans: (i) Insulin

Life Process class 10 Trend setter solved CBSE Test paper-05 SCIENCE & TECHNOLOGY (Class-10)        Chapter 6 : Life Process 1. Name the tissue associated with the conduction water in plants. (1 mark) Ans: Xylem tissue 2. What is source of O 2 liberated during photosynthesis? (1 mark) Ans: The main source of oxygen in the atmosphere during photosynthesis is photosynthetic [green] plants, cyanobacteria and algae which releases oxygen during photosynthesis. Other sources include the photolysis of atmospheric water and nitrous oxides by ultraviolet light and the free oxygen released from the silicates and mineral oxides present in the earth crust.  3. In which part of the digestive canal food is absorbed? (1 mark) Ans: small intestine 4. Which organelle of the cell is known as ‘power house’? (1 mark) Ans: Mitochondria 5. Why oxygenated and deoxygenated blood is separated in mammals and birds? (1 mark) Ans: Oxygenated and deoxygenated blood is separ

Life Process class 10 Trend setter solved CBSE Test paper-04 SCIENCE & TECHNOLOGY (Class-10)        Chapter 6 : Life Process 1. Name the artificial method for the removal of liquid nitrogenous waste from body. (1 mark) Ans:  D ialysis 2. Name any three waste products of plants? (1 mark) Ans:  The gums, resins and latexes 3. Name three excretory organs of man. (1 mark) Ans:  lungs, kidney and skin 4. Name the part of plants which helps in transportation. (1 mark) Ans:  Phloem tissue 5. Name the juice secreted by the liver. (1 mark) Ans:  Bile 6. What is the function of digestive enzymes? (2 marks) Ans:  Digestive enzymes such as amylase, lipase, pepsin, trypsin, etc. help in the breaking down of complex food particles into simple ones. These simple particles can be easily absorbed by the blood and thus transported to all the cells of the body. 7.   What is the role  of saliva in the digestion of food? (2 marks) Ans:  The salivary glands secrete the first of th