CBSE ADDA

IX CBSE - Formative Assessment-II [SET-1] Q.1. What are green revolution and white revolution? Q.2. What nutrients do the following provide: (i) Pea (ii) Linseed (iii) Vegetables (iv) pigeon pea (v) Wheat (vi) Castor (vii) Spices (viii) fruits. Q.3. Differentiate between Kharif and Rabi crops. Q.4. What is interspecific hybridization? Q.5. How does change in maturity duration of crop help the framers? Q.6. Categorize the following as macronutrients and micronutrients: (i) Calcium (ii) Molybdenum (iii) Phosphorus (iv) Iron (v) Boron (vi) Magnesium. Q.7. What is organic farming? Q.8. What is vermicomposting? Q.9. Differentiate between mixed and inter cropping. Q10. What are river lift systems? Q.11. Why are weeds considered as unwanted plants in cultivated lands? Q.12. In what three ways do the pests attack plants? IX CBSE - Formative Assessment-II [SET-2] Q.1. What qualities are expected in a cross-breed variety of fowl? Q.2.

IX Class Question solution for Physics Chapter Sound 1. How sound is produced? Answer:   Sound is produced by the vibration of vibrating object. 2. What do you understand by a ‘wave’? Answer:  A periodic disturbance created in material medium that transfer sound and light energy is called wave. 3. Write three differences between sound and light waves. Answer:   sound wave is Mechanical wave that require material medium for propagation where as light waves are electromagnetic wave that can travel in vacuum. 4. What do you understand by “sound energy cannot be produced”? Answer: Sound energy cannot be produced on its own. Some mechanical energy is required to make an object vibrate. It is the mechanical energy of the vibrating object which travels through a medium and ultimately reaches the ear. 5. What is the name of the wave that can travel through vacuum? Answer:   Electromagnetic wave 6. Explain by some experiment that sound waves require medium for their

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