CBSE Past Year Paper Session (2016-2017) Set - 1, Science Class 8 Class 8 Notes | EduRev

Past Year Papers For Class 8

Class 8 : CBSE Past Year Paper Session (2016-2017) Set - 1, Science Class 8 Class 8 Notes | EduRev

 Page 1


Q u e s t i o n 	 P a p e r 	 2 0 1 6 - 1 7 	
C B S E 	 C l a s s 	 8 	 S c i e n c e
G e n e r a l 	 I n s t r u c t i o n s
A l l 	 q u e s t i o n s 	 a r e 	 c o m p u l s o r y .
Q u e s t i o n s 	 N o . 	 1 	 t o 	 5 	 c a r r y 	 o n e 	 m a r k 	 e a c h .
Q u e s t i o n s 	 N o . 	 6 	 t o 	 1 0 	 c a r r y 	 t w o 	 m a r k s 	 e a c h .
Q u e s t i o n s 	 N o . 	 1 1 	 t o 	 1 5 	 c a r r y 	 t h r e e 	 m a r k s 	 e a c h .
Q u e s t i o n s 	 N o . 	 1 6 	 a n d 	 1 7 	 c a r r y 	 f i v e 	 m a r k s 	 e a c h .
Q u e s t i o n s 	 N o . 	 1 5 	 i s 	 v a l u e 	 b a s e d .
1 . 	 N a m e 	 t w o 	 n a t u r a l 	 f i b r e s .
2 . 	 D e f i n e 	 t h r e s h i n g .
3 . 	 W h a t 	 a r e 	 p o l y m e r s ?
4 . 	 N a m e 	 t w o 	 R a b i 	 c r o p s .
5 . 	 W h i c h 	 s y n t h e t i c 	 f i b r e 	 i s 	 a l s o 	 c a l l e d 	 ‘ a r t i f i c i a l 	 s i l k ” ?
6 . 	 M a t c h 	 t h e 	 C o l u m n 	 A 	 w i t h 	 B
‘ A ’ ‘ B ’
( i ) 	 K h a r i f 	 c r o p s ( a ) 	 F o d d e r
( i i ) 	 R a b i 	 c r o p s ( b ) 	 U r e a 	 a n d 	 N P K
( i i i ) 	 F e r t i l i z e r s ( c ) 	 D r u g 	 a n d 	 p l a n t 	 a n d 	 a n i m a l s 	 w a s t e
( i v ) 	 M a n u r e ( d ) 	 W h e a t , 	 G r a m , 	 P e a
	 ( e ) 	 P a d d y , 	 M a i z e
7 . 	 W r i t e 	 t h e 	 4 R 	 P r i n c i p l e ?
8 . 	 W h y 	 a r e 	 e l e c t r i c 	 p l u g s 	 a n d 	 s w i t c h e s 	 m a d e 	 o f 	 t h e r m o s e t t i n g 	 p l a s t i c s ?
9 . 	 H o w 	 i s 	 s y n t h e t i c 	 c l o t h 	 p r e p a r e d ?
Page 2


Q u e s t i o n 	 P a p e r 	 2 0 1 6 - 1 7 	
C B S E 	 C l a s s 	 8 	 S c i e n c e
G e n e r a l 	 I n s t r u c t i o n s
A l l 	 q u e s t i o n s 	 a r e 	 c o m p u l s o r y .
Q u e s t i o n s 	 N o . 	 1 	 t o 	 5 	 c a r r y 	 o n e 	 m a r k 	 e a c h .
Q u e s t i o n s 	 N o . 	 6 	 t o 	 1 0 	 c a r r y 	 t w o 	 m a r k s 	 e a c h .
Q u e s t i o n s 	 N o . 	 1 1 	 t o 	 1 5 	 c a r r y 	 t h r e e 	 m a r k s 	 e a c h .
Q u e s t i o n s 	 N o . 	 1 6 	 a n d 	 1 7 	 c a r r y 	 f i v e 	 m a r k s 	 e a c h .
Q u e s t i o n s 	 N o . 	 1 5 	 i s 	 v a l u e 	 b a s e d .
1 . 	 N a m e 	 t w o 	 n a t u r a l 	 f i b r e s .
2 . 	 D e f i n e 	 t h r e s h i n g .
3 . 	 W h a t 	 a r e 	 p o l y m e r s ?
4 . 	 N a m e 	 t w o 	 R a b i 	 c r o p s .
5 . 	 W h i c h 	 s y n t h e t i c 	 f i b r e 	 i s 	 a l s o 	 c a l l e d 	 ‘ a r t i f i c i a l 	 s i l k ” ?
6 . 	 M a t c h 	 t h e 	 C o l u m n 	 A 	 w i t h 	 B
‘ A ’ ‘ B ’
( i ) 	 K h a r i f 	 c r o p s ( a ) 	 F o d d e r
( i i ) 	 R a b i 	 c r o p s ( b ) 	 U r e a 	 a n d 	 N P K
( i i i ) 	 F e r t i l i z e r s ( c ) 	 D r u g 	 a n d 	 p l a n t 	 a n d 	 a n i m a l s 	 w a s t e
( i v ) 	 M a n u r e ( d ) 	 W h e a t , 	 G r a m , 	 P e a
	 ( e ) 	 P a d d y , 	 M a i z e
7 . 	 W r i t e 	 t h e 	 4 R 	 P r i n c i p l e ?
8 . 	 W h y 	 a r e 	 e l e c t r i c 	 p l u g s 	 a n d 	 s w i t c h e s 	 m a d e 	 o f 	 t h e r m o s e t t i n g 	 p l a s t i c s ?
9 . 	 H o w 	 i s 	 s y n t h e t i c 	 c l o t h 	 p r e p a r e d ?
1 0 . 	 W h a t 	 a r e 	 w e e d i c i d e s ? 	 G i v e 	 o n e 	 e x a m p l e .
1 1 . 	 E x p l a i n 	 t h r e e 	 d i f f e r e n c e s 	 b e t w e e n 	 m a n u r e 	 a n d 	 f e r t i l i z e r s .
1 2 . 	 F i l l 	 i n 	 t h e 	 b l a n k s .
I . 	 S y n t h e t i c 	 f i b r e s 	 a r e 	 a l s o 	 c a l l e d 	 _ _ _ _ _ _ _ _ 	 f i b r e s .
I I . 	 S y n t h e t i c 	 f i b r e s 	 h a v e 	 m o r e 	 s t r e n g t h 	 t h a n 	 _ _ _ _ _ _ _ _ .
I I I . 	 _ _ _ _ _ _ _ _ _ 	 d o 	 n o t 	 a b s o r b 	 w a t e r .
1 3 . 	 R e a d 	 t h e 	 f o l l o w i n g 	 p a s s a g e 	 c a r e f u l l y 	 a n d 	 a n s w e r 	 t h e 	 q u e s t i o n s 	 t h a t 	 f o l l o w : -
F a r m e r s 	 s t o r e 	 g r a i n s 	 i n 	 j u t e 	 b a g s 	 o r 	 m e t a l l i c 	 b i n s . 	 H o w e v e r , 	 l a r g e 	 s c a l e 	 s t r a n g e 	 o f 	 g r a i n s 	 i s
d o n e 	 i s 	 S i l a s 	 a n d 	 g r a n a r i e s 	 t o 	 p r o t e c t 	 t h e m 	 f o r m 	 p e s t s 	 l i k e 	 r a t s 	 a n d 	 i n s e c t s . 	 D r i e d 	 n e e m
l e a v e s 	 a r e 	 u s e d 	 f o r 	 s t o r i n g 	 g r a i n s 	 a t 	 h o m e . 	 F o r 	 s t o r i n g 	 l a r g e 	 q u a n t i t i e s 	 o f 	 g r a i n s 	 i n 	 b i g
g o d o w n s , 	 s p e c i f i c 	 c h e m i c a l 	 t r e a t m e n t s 	 a r e 	 r e q u i r e d 	 t o 	 p r o t e c t 	 t h e m 	 f r o m 	 p e s t s 	 a n d
m i c r o b e s . 	 ( i ) 	 W h y 	 d o 	 w e 	 u s e 	 N e e m 	 l e a v e s 	 f o r 	 s t r i n g 	 g r a i n s ?
( i i ) 	 N a m e 	 t w o 	 p e s t s ?
( i i i ) 	 W h e r e 	 i s 	 l a r g e 	 s c a l e 	 o f 	 s t o r a g e 	 o f 	 g r a i n s 	 d o n e ?
1 4 . 	 W h a t 	 i s 	 i r r i g a t i o n ? 	 W r i t e 	 t w o 	 m e t h o d s 	 o f 	 i r r i g a t i o n 	 w h i c h 	 c o n s e r v e 	 w a t e r ?
1 5 . 	 R e a d 	 t h e 	 f o l l o w i n g 	 p a r a g r a p h 	 a n d 	 a n s w e r 	 t h e 	 q u e s t i o n 	 g i v e n 	 b e l o w : -
M o h a n 	 w e n t 	 t o 	 t h e 	 m a r k e t 	 w i t h 	 h i s 	 m o t h e r . 	 T h e r e 	 h e 	 p u r c h a s e 	 a 	 p a c k e t 	 o f 	 c h i p s . 	 A f t e r 	 e a t i n g
c h i p s , 	 h e 	 t h r e w 	 h a l f 	 e a t e n 	 c h i p s 	 w i t h 	 p o l y t h e n e 	 o n 	 r o a d s i d e . 	 T h e 	 c o w 	 s t a n d i n g 	 n e a r b y
s t a r t e d 	 e a t i n g 	 t h r o w n 	 p a c k e t 	 o f 	 c h i p s 	 w i t h 	 p o l y t h e n e . 	 M o h a n ’ s 	 m o t h e r 	 m a d e 	 t h e 	 c o w 	 r u n
a w a y . 	 H i s 	 m o t h e r 	 s a i d 	 t h a t 	 f o o d 	 p a c k e t s , 	 w r a p p e r s 	 a n d 	 p o l y t h e n e 	 b a g s 	 s h o u l d 	 n o t 	 b e 	 t h r o w n
h e r e 	 a n d 	 t h e r e 	 b e c a u s e 	 p o l y t h e n e 	 b a g s 	 a r e 	 n o n - b i o d e g r a d a b l e . 	 T h e y 	 c a u s e 	 e n v i r o n m e n t a l
p o l l u t i o n 	 a n d 	 i f 	 c o w 	 s w a l l o w s 	 ( e a t s ) 	 t h e m . 	 t h e n 	 t h i s 	 b e c o m e s 	 f a t a l 	 f o r 	 c o w ’ s 	 l i f e . 	 ( i ) 	 H o w 	 c a n
w e 	 r e d u c e 	 t h e 	 u s e 	 o f 	 p o l y t h e n e ? 	 ( i i ) 	 W h a t 	 a r e 	 t h e 	 v a l u e s 	 d i s p l a y e d 	 o r 	 s h o w n 	 b y 	 M o h a n ’ s
m o t h e r ? 	 W r i t e 	 a n y 	 t w o 	 v a l u e s
1 6 . 	 a . 	 W h a t 	 i s 	 c r o p ?
b . 	 L i s t 	 t h e 	 v a r i o u s 	 a c t i v i t i e s 	 o r 	 t a s k s 	 i n v o l v e d 	 i n 	 g r o w i n g 	 o f 	 c r o p s .
1 7 . 	 D r a w 	 t w o 	 o b j e c t s 	 o r 	 a r t i c l e s 	 m a d e 	 f r o m 	 t h e r m o s e t t i n g 	 p l a s t i c s 	 a n d 	 n a m e 	 t h e m .
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