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CBSE Questions

Total Questions 9982
TWO IDENTICAL RESISTORS EACH OF RESISTANCE 10 OHM ARE CONNECTED IN (a)SERIES (b)PARALLEL TO A 6V BATTERY. CALCULATE THE RATIO OF POWER CONSUMED IN THE COMBINATION OF RESISTORS IN THE CASES.
LIST FOUR CHARACTERISTICS OF A GOOD SOURCE OF ENERGY AND MENTION ANY FOUR QUALITIES OF A GOOD FUEL.
EXPLAIN FOUR DISADVANTAGES OF BURNING FOSSIL FUELS.
DEFINE A SOLENOID WITH THE HELP OF A SUITABLE DIAGRAM.SHOW THE PATTERN OF MAGNETIC FIELD LINES AROUND A CURRENT CARRYING SOLENOID.STATE THE REGION WHERE FIELD IS UNIFORM.
(a)DEFINE ELECTRIC POWER. (b)A DEVICE OF RESISTANCE R IS CONNECTED ACROSS A SOURCE OF V VOLTAGE AND DRAWS A CURRENT I.DERIVE AN EXPRESSION FOR POWER IN TERMS V AND I. (c)AN ELECTRIC BULB IS CONNECTED TO A 220V GENERATOR .THE CURRANT IS 0.5A.WHAT IS THE POWER OF THE BULB.
WHICH SOLUTION CAN DISSOLVE GOLD IN IT ?
GIVE FOUR CHARACTERISTICS OF MAGNETIC FIELD LINES.
(a)WRITE THE CHEMICAL NAME OF THE COATING FORMS ON SILVER COPPER ARTICLES WHEN THESE ARE EXPOSED TO MOIST AIR. (b)EXPLAIN GALVANISATION.
EXPLAIN THE FORMATION OF IONIC COMPOUND CaO WITH ELECTRON-DOT STRUCTURES. NAME THE CONSTITUENT METALS OF BRONZE.
DIFFERENTIATE BETWEEN STRONG ACID AND WEAK ACIDS.IDENTIFY THE STRONG AND WEAK ACIDS AMONG THE FOLLOWING; HCl,ACETIC ACID,FORMIC ACID,NITRIC ACID.
WHICH SOLUTION CAN DISSOLVE GOLD IN IT ?
WHAT IS RANCIDITY? MENTION ANY THREE WAYS TO PREVENT RANCIDITY AND EXPLAIN IT.
(a)IDENTIFY THE TYPE OF CHEMICAL REACTION THAT WILL TAKE PLACE WHEN SILVER CHLORIDE PLACED IN SUNLIGHT AND DEFINE IT.HOW WILL THE COLOR OF THE SALT CHANGE. (b)WRITE THE CHEMICAL EQUATION FOR THE REACTION. (c)MENTION THE COMMERCIAL USE OF THE SALT.
WHY DO IONIC COMPOUNDS HAVE HIGH MELTING POINTS?GIVE REASONS.
IDENTIFY THE TYPE OF CHEMICAL REACTION AND WRITE THE CHEMICAL EQUATION FOR THE REACTION THAT TAKES PLACE WHEN A SOLUTION OF POTTASSIUM CHLORIDE IS MIXED WITH SILVER NITRATE SOLUTION. WRITE THE CHEMICAL NAME OF ONE OF THE PRODUCTS FORMED.
WHO IS THE AUTHOR OF THE NOVEL TITASH EKTA NADIR NAMM. WHY IS IT CONSIDERED A SPECIAL NOVEL?
WHAT ACTIONS OF ROBINSON CRUSOE MADE HIM AS A TYPICAL COLONIALIST.
DESCRIBE THE LAND RECLAMATION IN BOMBAY.
WHEN AND WHERE WAS THE FIRST SECTION OF THE UNDERGROUND RAILWAY OPENED IN THE WORLD. EXPLAIN ANY THREE DIFFICULTIES OF TRAVELLING IN THAT UNDERGROUND RAILWAY.
DISTINGUISH BETWEEN EPISTOLARY AND SERIALISED NOVELS WITH EXAMPLES.