CBSE Science 11 and 12

  DIGESTION AND ABSORPTION (30-MCQ QUESTIONS)-1 Q1. WHEN EACH TOOTH IS ATTACHED IN THE SOCKET OF JAW BONE, THEN THIS TYPE OF ATTACHMENT IS CALLED- 1) THECODONT  2) LOPHODONT 3) SECODONT 4) SOLENODONT Q2. ORAL CAVITY LEADS INTO A SHORT PHARYNX WHICH SERVES AS A COMMON PASSAGE FOR- 1) FOOD ONLY 2) AIR ONLY 3) FOOD AND AIR 4) DIGESTIVE JUICES Q3. ARRANGEMENT OF TEETH IN EACH HALF OF BOTH UPPER AND LOWER JAW IN THE ORDER I, C, PM, M IS REPRESENTED BY A DENTAL FORMULA WHICH IN HUMANS IS 1) 2132    2132 2) 2123     2123 3) 2312     2312 4) 3212     3212 Q4. WHICH OF THE FOLLOWING PREVENTS THE ENTRY OF FOOD INTO THE WIND PIPE? 1) GLOTTIS 2) PHARYNX 3) EPIGLOTTIS 4) BOTH 1 & 2. Q5. FRENULUM IS/ARE 1) ADENOID PRESENT ON PHARYNGEAL WALL 2) TONSILS FOUND ON THE LATERAL WALLS OF SOFT PALATE 3) V-SHAPED SULCUS DIVIDING TONGUE INTO PHARYNGEAL AND ORAL PARTS. 4) FOLD ATTACHING THE TONGUE TO THE FLOOR OF THE ORAL CAVITY. Q6. CHEWING IS REQUIRED FOR ...

Q) WHAT IS FORCE?  > FORCE IS EITHER A PUSH OR A PULL.  Q) WHAT ARE THE EFFECTS OF FORCE?    > THE EFFECTS OF FORCES ARE AS FOLLOWS-    1. IT CAN MAKE A STATIONARY BODY MOVE.  2. IT CAN MAKE A MOVING BODY STOP.  3. IT  CAN CHANGE THE DIRECTION OF A MOVING BODY.  4. IT CAN CHANGE THE SPEED OF A MOVING BODY.  5. IT CAN CHANGE THE SHAPE AND SIZE OF A BODY.  Q) BY USING AN EXAMPLE EXPLAIN HOW A FORCE CAN MOVE A STATIONARY BODY? > THE TABLE STARTS MOVING IN THE DIRECTION OF THE FORCE APPLIED. THUS, A FORCE CAN SET A BODY AT REST INTO MOTION. FORCE MAKING A STATIONARY BODY MOVE   Q)  BY USING AN EXAMPLE EXPLAIN HOW A FORCE CAN MAKE A MOVING  BODY STOP? > THE FIELDER APPLIES FORCE WITH HIS HANDS TO STOP THE BALL FROM GOING FURTHER. THUS WE CAN SAY THAT A FORCE CAN MAKE A MOVING BODY STOP. Q) BY USING AN EXAMPLE EXPLAIN HOW A FORCE CAN CHANGE THE DIRECTION OF A MOVING BODY ? >  IN FOOTBALL, WE SEE THA...