Class 7 Exam > Class 7 Notes > Science Class 7 > Class 7 Science: CBSE Past Year Paper - 12
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Page 1 G e n e r a l I n s t r u c t i o n s : T h e p a p e r i s d i v i d e d i n t o t w o s e c t i o n s “ A ” a n d “ B ” . Y o u h a v e t o a t t e m p t a l l t h e q u e s t i o n s . Q u e s t i o n s 1 t o 5 a r e v e r y s h o r t a n s w e r t y p e q u e s t i o n s a n d 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 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 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 1 6 t o 1 8 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 1 9 t o 3 3 i n S e c t i o n B a r e M C Q q u e s t i o n s o f 1 m a r k e a c h . S e c t i o n A 1 . W h a t a r e t h e t h r e e f o r m s o f w a t e r ? 2 . N a m e t w o e l e m e n t s t h a t d e t e r m i n e t h e w e a t h e r o f a p l a c e . 3 . W h i c h a c i d i s p r e s e n t i n c u r d ? 4 . G i v e t w o e x a m p l e s o f c o n d u c t o r s . 5 . W h y d o w e g e t i n s t a n t e n e r g y f r o m g l u c o s e ? 6 . T h e d i s t a n c e b e t w e e n t w o s e c t i o n s i s 3 6 0 k m . A t r a i n t a k e s 6 h o u r s t o c o v e r t h i s d i s t a n c e . C a l c u l a t e t h e s p e e d o f t h e t r a i n . 7 . S t a t e t w o e x p e r i e n c e s t h a t m a k e y o u t h i n k t h a t a i r e x e r t s p r e s s u r e . 8 . W h a t i s d r i p i r r i g a t i o n ? 9 . W h y i s f a c t o r y w a s t e n e u t r a l i z e d b e f o r e d i s p o s i n g i t i n t o w a t e r b o d i e s ? 1 0 . I n d i c a t e t h e t y p e o f c l i m a t e o f t h e f o l l o w i n g a r e a s : a ) K e r a l a b ) J a m m u a n d K a s h m i r c ) R a j a s t h a n d ) N o r t h - e a s t I n d i a 1 1 . D i s c u s s w h y w e a r i n g m o r e l a y e r s o f c l o t h i n g d u r i n g w i n t e r k e e p s u s w a r m e r t h a n w e a r i n g j u s t o n e t h i c k p i e c e o f c l o t h i n g . Page 2 G e n e r a l I n s t r u c t i o n s : T h e p a p e r i s d i v i d e d i n t o t w o s e c t i o n s “ A ” a n d “ B ” . Y o u h a v e t o a t t e m p t a l l t h e q u e s t i o n s . Q u e s t i o n s 1 t o 5 a r e v e r y s h o r t a n s w e r t y p e q u e s t i o n s a n d 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 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 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 1 6 t o 1 8 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 1 9 t o 3 3 i n S e c t i o n B a r e M C Q q u e s t i o n s o f 1 m a r k e a c h . S e c t i o n A 1 . W h a t a r e t h e t h r e e f o r m s o f w a t e r ? 2 . N a m e t w o e l e m e n t s t h a t d e t e r m i n e t h e w e a t h e r o f a p l a c e . 3 . W h i c h a c i d i s p r e s e n t i n c u r d ? 4 . G i v e t w o e x a m p l e s o f c o n d u c t o r s . 5 . W h y d o w e g e t i n s t a n t e n e r g y f r o m g l u c o s e ? 6 . T h e d i s t a n c e b e t w e e n t w o s e c t i o n s i s 3 6 0 k m . A t r a i n t a k e s 6 h o u r s t o c o v e r t h i s d i s t a n c e . C a l c u l a t e t h e s p e e d o f t h e t r a i n . 7 . S t a t e t w o e x p e r i e n c e s t h a t m a k e y o u t h i n k t h a t a i r e x e r t s p r e s s u r e . 8 . W h a t i s d r i p i r r i g a t i o n ? 9 . W h y i s f a c t o r y w a s t e n e u t r a l i z e d b e f o r e d i s p o s i n g i t i n t o w a t e r b o d i e s ? 1 0 . I n d i c a t e t h e t y p e o f c l i m a t e o f t h e f o l l o w i n g a r e a s : a ) K e r a l a b ) J a m m u a n d K a s h m i r c ) R a j a s t h a n d ) N o r t h - e a s t I n d i a 1 1 . D i s c u s s w h y w e a r i n g m o r e l a y e r s o f c l o t h i n g d u r i n g w i n t e r k e e p s u s w a r m e r t h a n w e a r i n g j u s t o n e t h i c k p i e c e o f c l o t h i n g . 1 2 . S t a t e t h r e e d i f f e r e n c e s b e t w e e n a l a b o r a t o r y t h e r m o m e t e r a n d a c l i n i c a l t h e r m o m e t e r . 1 3 . W h a t i s m e a n t b y : a ) s h e a r i n g b ) r e e l i n g c ) s e r i c u l t u r e 1 4 . M a k e a p o s t e r w i t h s l o g a n s o n s a v i n g w a t e r . 1 5 . C l a s s i f y t h e f o l l o w i n g a s s t r a i g h t l i n e , c i r c u l a r o r o s c i l l a t o r y m o t i o n : a ) M o t i o n o f t h e h a m m e r o n a n e l e c t r i c b e l l b ) M o t i o n o f a c h i l d o n a m e r r y - g o - r o u n d c ) M o t i o n o f a t r a i n o n a s t r a i g h t b r i d g e 1 6 . F i l l i n t h e b l a n k s : a ) W i n d i s _ _ _ _ _ _ _ _ _ a i r . b ) W i n d s a r e g e n e r a t e d d u e t o _ _ _ _ _ _ _ _ _ _ _ _ _ h e a t i n g o n t h e e a r t h . c ) N e a r t h e e a r t h ’ s s u r f a c e _ _ _ _ _ _ _ _ _ _ _ _ a i r r i s e s u p w h e r e a s _ _ _ _ _ _ _ _ _ _ _ _ a i r c o m e s d o w n . d ) A i r m o v e s f r o m a r e g i o n o f _ _ _ _ _ _ _ _ _ _ _ _ p r e s s u r e t o a r e g i o n o f _ _ _ _ _ _ _ _ _ _ _ _ p r e s s u r e . e ) A c y c l o n e i s c a l l e d a _ _ _ _ _ _ _ _ _ _ _ _ _ i n A m e r i c a . 1 7 . W r i t e T r u e o r F a l s e a g a i n s t t h e s t a t e m e n t s b e l o w : a ) N i t r i c a c i d t u r n s r e d l i t m u s b l u e . b ) S o d i u m h y d r o x i d e t u r n s b l u e l i t m u s r e d . c ) T o o t h d e c a y i s c a u s e d b y t h e p r e s e n c e o f a n a c i d . d ) T u r m e r i c t u r n b a s e r e d . e ) P h e n o l p h t h a l e i n t u r n a c i d s p i n k . 1 8 . a ) H o w d o e l e p h a n t s l i v i n g i n t h e t r o p i c a l r a i n f o r e s t s a d a p t t h e m s e l v e s ? b ) H o w d o p o l a r b e a r s l i v i n g i n t h e p o l a r r e g i o n s a d a p t t h e m s e l v e s ? S e c t i o n B 1 9 . W h i c h o n e o f t h e f o l l o w i n g p l a c e i s u n l i k e l y t o b e a f f e c t e d b y a c y c l o n e ? a ) C h e n n a i b ) M a n g a l o r e c ) A m r i t s a r d ) P u r i Page 3 G e n e r a l I n s t r u c t i o n s : T h e p a p e r i s d i v i d e d i n t o t w o s e c t i o n s “ A ” a n d “ B ” . Y o u h a v e t o a t t e m p t a l l t h e q u e s t i o n s . Q u e s t i o n s 1 t o 5 a r e v e r y s h o r t a n s w e r t y p e q u e s t i o n s a n d 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 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 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 1 6 t o 1 8 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 1 9 t o 3 3 i n S e c t i o n B a r e M C Q q u e s t i o n s o f 1 m a r k e a c h . S e c t i o n A 1 . W h a t a r e t h e t h r e e f o r m s o f w a t e r ? 2 . N a m e t w o e l e m e n t s t h a t d e t e r m i n e t h e w e a t h e r o f a p l a c e . 3 . W h i c h a c i d i s p r e s e n t i n c u r d ? 4 . G i v e t w o e x a m p l e s o f c o n d u c t o r s . 5 . W h y d o w e g e t i n s t a n t e n e r g y f r o m g l u c o s e ? 6 . T h e d i s t a n c e b e t w e e n t w o s e c t i o n s i s 3 6 0 k m . A t r a i n t a k e s 6 h o u r s t o c o v e r t h i s d i s t a n c e . C a l c u l a t e t h e s p e e d o f t h e t r a i n . 7 . S t a t e t w o e x p e r i e n c e s t h a t m a k e y o u t h i n k t h a t a i r e x e r t s p r e s s u r e . 8 . W h a t i s d r i p i r r i g a t i o n ? 9 . W h y i s f a c t o r y w a s t e n e u t r a l i z e d b e f o r e d i s p o s i n g i t i n t o w a t e r b o d i e s ? 1 0 . I n d i c a t e t h e t y p e o f c l i m a t e o f t h e f o l l o w i n g a r e a s : a ) K e r a l a b ) J a m m u a n d K a s h m i r c ) R a j a s t h a n d ) N o r t h - e a s t I n d i a 1 1 . D i s c u s s w h y w e a r i n g m o r e l a y e r s o f c l o t h i n g d u r i n g w i n t e r k e e p s u s w a r m e r t h a n w e a r i n g j u s t o n e t h i c k p i e c e o f c l o t h i n g . 1 2 . S t a t e t h r e e d i f f e r e n c e s b e t w e e n a l a b o r a t o r y t h e r m o m e t e r a n d a c l i n i c a l t h e r m o m e t e r . 1 3 . W h a t i s m e a n t b y : a ) s h e a r i n g b ) r e e l i n g c ) s e r i c u l t u r e 1 4 . M a k e a p o s t e r w i t h s l o g a n s o n s a v i n g w a t e r . 1 5 . C l a s s i f y t h e f o l l o w i n g a s s t r a i g h t l i n e , c i r c u l a r o r o s c i l l a t o r y m o t i o n : a ) M o t i o n o f t h e h a m m e r o n a n e l e c t r i c b e l l b ) M o t i o n o f a c h i l d o n a m e r r y - g o - r o u n d c ) M o t i o n o f a t r a i n o n a s t r a i g h t b r i d g e 1 6 . F i l l i n t h e b l a n k s : a ) W i n d i s _ _ _ _ _ _ _ _ _ a i r . b ) W i n d s a r e g e n e r a t e d d u e t o _ _ _ _ _ _ _ _ _ _ _ _ _ h e a t i n g o n t h e e a r t h . c ) N e a r t h e e a r t h ’ s s u r f a c e _ _ _ _ _ _ _ _ _ _ _ _ a i r r i s e s u p w h e r e a s _ _ _ _ _ _ _ _ _ _ _ _ a i r c o m e s d o w n . d ) A i r m o v e s f r o m a r e g i o n o f _ _ _ _ _ _ _ _ _ _ _ _ p r e s s u r e t o a r e g i o n o f _ _ _ _ _ _ _ _ _ _ _ _ p r e s s u r e . e ) A c y c l o n e i s c a l l e d a _ _ _ _ _ _ _ _ _ _ _ _ _ i n A m e r i c a . 1 7 . W r i t e T r u e o r F a l s e a g a i n s t t h e s t a t e m e n t s b e l o w : a ) N i t r i c a c i d t u r n s r e d l i t m u s b l u e . b ) S o d i u m h y d r o x i d e t u r n s b l u e l i t m u s r e d . c ) T o o t h d e c a y i s c a u s e d b y t h e p r e s e n c e o f a n a c i d . d ) T u r m e r i c t u r n b a s e r e d . e ) P h e n o l p h t h a l e i n t u r n a c i d s p i n k . 1 8 . a ) H o w d o e l e p h a n t s l i v i n g i n t h e t r o p i c a l r a i n f o r e s t s a d a p t t h e m s e l v e s ? b ) H o w d o p o l a r b e a r s l i v i n g i n t h e p o l a r r e g i o n s a d a p t t h e m s e l v e s ? S e c t i o n B 1 9 . W h i c h o n e o f t h e f o l l o w i n g p l a c e i s u n l i k e l y t o b e a f f e c t e d b y a c y c l o n e ? a ) C h e n n a i b ) M a n g a l o r e c ) A m r i t s a r d ) P u r i 2 0 . A n i r o n b a l l a t 4 0 d e g r e e C e l s i u s i s d r o p p e d i n a m u g c o n t a i n i n g w a t e r a t 4 0 d e g r e e c e l c i u s . T h e h e a t w i l l : a ) F l o w f r o m i r o n b a l l t o w a t e r b ) N o t f l o w f r o m i r o n b a l l t o w a t e r o r f r o m w a t e r t o i r o n b a l l c ) F l o w f r o m w a t e r t o i r o n b a l l d ) I n c r e a s e t h e t e m p e r a t u r e o f b o t h 2 1 . S t a i n l e s s s t e e l p a n s a r e u s u a l l y p r o v i d e d w i t h c o p p e r b o t t o m s . T h e r e a s o n f o r t h i s c o u l d b e t h a t : a ) C o p p e r b o t t o m m a k e s t h e p a n m o r e d u r a b l e b ) S u c h p a n s a p p e a r c o l o u r f u l c ) C o p p e r i s a b e t t e r c o n d u c t o r o f h e a t t h a n s t a i n l e s s s t e e l d ) C o p p e r i s e a s i e r t o c l e a n t h a n s t a i n l e s s s t e e l 2 2 . W a t e r g e t s h e a t e d b y t h e p r o c e s s o f : a ) R a d i a t i o n b ) C o n d u c t i o n c ) C o n v e c t i o n d ) E v a p o r a t i o n 2 3 . L i c h e n s a r e a n e x a m p l e o f : a ) P a r a s i t e s b ) S a p o t r o p h s c ) S y m b i o t i c r e l a t i o n s h i p d ) I n s e c t i v o r o u s p l a n t 2 4 . B l o w u p t w o b a l l o o n s w i t h a l i t t l e w a t e r i n e a c h a n d t i e . H a n g t h e b a l l o o n s 8 - 1 0 c m a p a r t o n a s t i c k . B l o w i n t h e s p a c e b e t w e e n t h e b a l l o o n s . W h a t h a p p e n s ? a ) T h e b a l l o o n s s t i c k t o e a c h o t h e r b ) T h e b a l l o o n s m o v e a p a r t c ) N o c h a n g e i n p o s i t i o n o f b a l l o o n s d ) S o m e t i m e s t h e y m o v e a w a y a n d s o m e t i m e s s t i c k t o e a c h o t h e r 2 5 . C o m p l e t e d i g e s t i o n o f f o o d t a k e s p l a c e i n t h e : a ) S t o m a c h Page 4 G e n e r a l I n s t r u c t i o n s : T h e p a p e r i s d i v i d e d i n t o t w o s e c t i o n s “ A ” a n d “ B ” . Y o u h a v e t o a t t e m p t a l l t h e q u e s t i o n s . Q u e s t i o n s 1 t o 5 a r e v e r y s h o r t a n s w e r t y p e q u e s t i o n s a n d 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 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 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 1 6 t o 1 8 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 1 9 t o 3 3 i n S e c t i o n B a r e M C Q q u e s t i o n s o f 1 m a r k e a c h . S e c t i o n A 1 . W h a t a r e t h e t h r e e f o r m s o f w a t e r ? 2 . N a m e t w o e l e m e n t s t h a t d e t e r m i n e t h e w e a t h e r o f a p l a c e . 3 . W h i c h a c i d i s p r e s e n t i n c u r d ? 4 . G i v e t w o e x a m p l e s o f c o n d u c t o r s . 5 . W h y d o w e g e t i n s t a n t e n e r g y f r o m g l u c o s e ? 6 . T h e d i s t a n c e b e t w e e n t w o s e c t i o n s i s 3 6 0 k m . A t r a i n t a k e s 6 h o u r s t o c o v e r t h i s d i s t a n c e . C a l c u l a t e t h e s p e e d o f t h e t r a i n . 7 . S t a t e t w o e x p e r i e n c e s t h a t m a k e y o u t h i n k t h a t a i r e x e r t s p r e s s u r e . 8 . W h a t i s d r i p i r r i g a t i o n ? 9 . W h y i s f a c t o r y w a s t e n e u t r a l i z e d b e f o r e d i s p o s i n g i t i n t o w a t e r b o d i e s ? 1 0 . I n d i c a t e t h e t y p e o f c l i m a t e o f t h e f o l l o w i n g a r e a s : a ) K e r a l a b ) J a m m u a n d K a s h m i r c ) R a j a s t h a n d ) N o r t h - e a s t I n d i a 1 1 . D i s c u s s w h y w e a r i n g m o r e l a y e r s o f c l o t h i n g d u r i n g w i n t e r k e e p s u s w a r m e r t h a n w e a r i n g j u s t o n e t h i c k p i e c e o f c l o t h i n g . 1 2 . S t a t e t h r e e d i f f e r e n c e s b e t w e e n a l a b o r a t o r y t h e r m o m e t e r a n d a c l i n i c a l t h e r m o m e t e r . 1 3 . W h a t i s m e a n t b y : a ) s h e a r i n g b ) r e e l i n g c ) s e r i c u l t u r e 1 4 . M a k e a p o s t e r w i t h s l o g a n s o n s a v i n g w a t e r . 1 5 . C l a s s i f y t h e f o l l o w i n g a s s t r a i g h t l i n e , c i r c u l a r o r o s c i l l a t o r y m o t i o n : a ) M o t i o n o f t h e h a m m e r o n a n e l e c t r i c b e l l b ) M o t i o n o f a c h i l d o n a m e r r y - g o - r o u n d c ) M o t i o n o f a t r a i n o n a s t r a i g h t b r i d g e 1 6 . F i l l i n t h e b l a n k s : a ) W i n d i s _ _ _ _ _ _ _ _ _ a i r . b ) W i n d s a r e g e n e r a t e d d u e t o _ _ _ _ _ _ _ _ _ _ _ _ _ h e a t i n g o n t h e e a r t h . c ) N e a r t h e e a r t h ’ s s u r f a c e _ _ _ _ _ _ _ _ _ _ _ _ a i r r i s e s u p w h e r e a s _ _ _ _ _ _ _ _ _ _ _ _ a i r c o m e s d o w n . d ) A i r m o v e s f r o m a r e g i o n o f _ _ _ _ _ _ _ _ _ _ _ _ p r e s s u r e t o a r e g i o n o f _ _ _ _ _ _ _ _ _ _ _ _ p r e s s u r e . e ) A c y c l o n e i s c a l l e d a _ _ _ _ _ _ _ _ _ _ _ _ _ i n A m e r i c a . 1 7 . W r i t e T r u e o r F a l s e a g a i n s t t h e s t a t e m e n t s b e l o w : a ) N i t r i c a c i d t u r n s r e d l i t m u s b l u e . b ) S o d i u m h y d r o x i d e t u r n s b l u e l i t m u s r e d . c ) T o o t h d e c a y i s c a u s e d b y t h e p r e s e n c e o f a n a c i d . d ) T u r m e r i c t u r n b a s e r e d . e ) P h e n o l p h t h a l e i n t u r n a c i d s p i n k . 1 8 . a ) H o w d o e l e p h a n t s l i v i n g i n t h e t r o p i c a l r a i n f o r e s t s a d a p t t h e m s e l v e s ? b ) H o w d o p o l a r b e a r s l i v i n g i n t h e p o l a r r e g i o n s a d a p t t h e m s e l v e s ? S e c t i o n B 1 9 . W h i c h o n e o f t h e f o l l o w i n g p l a c e i s u n l i k e l y t o b e a f f e c t e d b y a c y c l o n e ? a ) C h e n n a i b ) M a n g a l o r e c ) A m r i t s a r d ) P u r i 2 0 . A n i r o n b a l l a t 4 0 d e g r e e C e l s i u s i s d r o p p e d i n a m u g c o n t a i n i n g w a t e r a t 4 0 d e g r e e c e l c i u s . T h e h e a t w i l l : a ) F l o w f r o m i r o n b a l l t o w a t e r b ) N o t f l o w f r o m i r o n b a l l t o w a t e r o r f r o m w a t e r t o i r o n b a l l c ) F l o w f r o m w a t e r t o i r o n b a l l d ) I n c r e a s e t h e t e m p e r a t u r e o f b o t h 2 1 . S t a i n l e s s s t e e l p a n s a r e u s u a l l y p r o v i d e d w i t h c o p p e r b o t t o m s . T h e r e a s o n f o r t h i s c o u l d b e t h a t : a ) C o p p e r b o t t o m m a k e s t h e p a n m o r e d u r a b l e b ) S u c h p a n s a p p e a r c o l o u r f u l c ) C o p p e r i s a b e t t e r c o n d u c t o r o f h e a t t h a n s t a i n l e s s s t e e l d ) C o p p e r i s e a s i e r t o c l e a n t h a n s t a i n l e s s s t e e l 2 2 . W a t e r g e t s h e a t e d b y t h e p r o c e s s o f : a ) R a d i a t i o n b ) C o n d u c t i o n c ) C o n v e c t i o n d ) E v a p o r a t i o n 2 3 . L i c h e n s a r e a n e x a m p l e o f : a ) P a r a s i t e s b ) S a p o t r o p h s c ) S y m b i o t i c r e l a t i o n s h i p d ) I n s e c t i v o r o u s p l a n t 2 4 . B l o w u p t w o b a l l o o n s w i t h a l i t t l e w a t e r i n e a c h a n d t i e . H a n g t h e b a l l o o n s 8 - 1 0 c m a p a r t o n a s t i c k . B l o w i n t h e s p a c e b e t w e e n t h e b a l l o o n s . W h a t h a p p e n s ? a ) T h e b a l l o o n s s t i c k t o e a c h o t h e r b ) T h e b a l l o o n s m o v e a p a r t c ) N o c h a n g e i n p o s i t i o n o f b a l l o o n s d ) S o m e t i m e s t h e y m o v e a w a y a n d s o m e t i m e s s t i c k t o e a c h o t h e r 2 5 . C o m p l e t e d i g e s t i o n o f f o o d t a k e s p l a c e i n t h e : a ) S t o m a c h b ) L a r g e i n t e s t i n e c ) L i v e r d ) S m a l l i n t e s t i n e 2 6 . W a t e r f r o m t h e u n d i g e s t e d f o o d i s a b s o r b e d m a i n l y i n t h e : a ) S t o m a c h b ) F o o d p i p e c ) S m a l l i n t e s t i n e d ) L a r g e i n t e s t i n e 2 7 . W h i c h o p t i o n b e s t d e s c r i b e s a t r o p i c a l r e g i o n ? a ) H o t a n d h u m i d b ) M o d e r a t e t e m p e r a t u r e , h e a v y r a i n f a l l c ) C o l d a n d h u m i d d ) H o t a n d d r y 2 8 . P l a n t s t a k e c a r b o n d i o x i d e f r o m t h e a t m o s p h e r e m a i n l y t h r o u g h t h e i r : a ) R o o t s b ) S t e m c ) F l o w e r s d ) L e a v e s 2 9 . T h e p l a n t w h i c h t r a p s a n d f e e d s o n i n s e c t s i s : a ) C u s c u t a b ) C h i n a r o s e c ) P i t c h e r p l a n t d ) R o s e 3 0 . T h r o u g h w a s h i n g o f s h e a r e d s k i n o f s h e e p w i t h h a i r i s c a l l e d a ) S o r t i n g b ) S c o u r i n g c ) B r e e d i n g d ) R o l l i n g 3 1 . T h e n a t u r e o f w a t e r i s : a ) A c i d i c Page 5 G e n e r a l I n s t r u c t i o n s : T h e p a p e r i s d i v i d e d i n t o t w o s e c t i o n s “ A ” a n d “ B ” . Y o u h a v e t o a t t e m p t a l l t h e q u e s t i o n s . Q u e s t i o n s 1 t o 5 a r e v e r y s h o r t a n s w e r t y p e q u e s t i o n s a n d 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 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 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 1 6 t o 1 8 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 1 9 t o 3 3 i n S e c t i o n B a r e M C Q q u e s t i o n s o f 1 m a r k e a c h . S e c t i o n A 1 . W h a t a r e t h e t h r e e f o r m s o f w a t e r ? 2 . N a m e t w o e l e m e n t s t h a t d e t e r m i n e t h e w e a t h e r o f a p l a c e . 3 . W h i c h a c i d i s p r e s e n t i n c u r d ? 4 . G i v e t w o e x a m p l e s o f c o n d u c t o r s . 5 . W h y d o w e g e t i n s t a n t e n e r g y f r o m g l u c o s e ? 6 . T h e d i s t a n c e b e t w e e n t w o s e c t i o n s i s 3 6 0 k m . A t r a i n t a k e s 6 h o u r s t o c o v e r t h i s d i s t a n c e . C a l c u l a t e t h e s p e e d o f t h e t r a i n . 7 . S t a t e t w o e x p e r i e n c e s t h a t m a k e y o u t h i n k t h a t a i r e x e r t s p r e s s u r e . 8 . W h a t i s d r i p i r r i g a t i o n ? 9 . W h y i s f a c t o r y w a s t e n e u t r a l i z e d b e f o r e d i s p o s i n g i t i n t o w a t e r b o d i e s ? 1 0 . I n d i c a t e t h e t y p e o f c l i m a t e o f t h e f o l l o w i n g a r e a s : a ) K e r a l a b ) J a m m u a n d K a s h m i r c ) R a j a s t h a n d ) N o r t h - e a s t I n d i a 1 1 . D i s c u s s w h y w e a r i n g m o r e l a y e r s o f c l o t h i n g d u r i n g w i n t e r k e e p s u s w a r m e r t h a n w e a r i n g j u s t o n e t h i c k p i e c e o f c l o t h i n g . 1 2 . S t a t e t h r e e d i f f e r e n c e s b e t w e e n a l a b o r a t o r y t h e r m o m e t e r a n d a c l i n i c a l t h e r m o m e t e r . 1 3 . W h a t i s m e a n t b y : a ) s h e a r i n g b ) r e e l i n g c ) s e r i c u l t u r e 1 4 . M a k e a p o s t e r w i t h s l o g a n s o n s a v i n g w a t e r . 1 5 . C l a s s i f y t h e f o l l o w i n g a s s t r a i g h t l i n e , c i r c u l a r o r o s c i l l a t o r y m o t i o n : a ) M o t i o n o f t h e h a m m e r o n a n e l e c t r i c b e l l b ) M o t i o n o f a c h i l d o n a m e r r y - g o - r o u n d c ) M o t i o n o f a t r a i n o n a s t r a i g h t b r i d g e 1 6 . F i l l i n t h e b l a n k s : a ) W i n d i s _ _ _ _ _ _ _ _ _ a i r . b ) W i n d s a r e g e n e r a t e d d u e t o _ _ _ _ _ _ _ _ _ _ _ _ _ h e a t i n g o n t h e e a r t h . c ) N e a r t h e e a r t h ’ s s u r f a c e _ _ _ _ _ _ _ _ _ _ _ _ a i r r i s e s u p w h e r e a s _ _ _ _ _ _ _ _ _ _ _ _ a i r c o m e s d o w n . d ) A i r m o v e s f r o m a r e g i o n o f _ _ _ _ _ _ _ _ _ _ _ _ p r e s s u r e t o a r e g i o n o f _ _ _ _ _ _ _ _ _ _ _ _ p r e s s u r e . e ) A c y c l o n e i s c a l l e d a _ _ _ _ _ _ _ _ _ _ _ _ _ i n A m e r i c a . 1 7 . W r i t e T r u e o r F a l s e a g a i n s t t h e s t a t e m e n t s b e l o w : a ) N i t r i c a c i d t u r n s r e d l i t m u s b l u e . b ) S o d i u m h y d r o x i d e t u r n s b l u e l i t m u s r e d . c ) T o o t h d e c a y i s c a u s e d b y t h e p r e s e n c e o f a n a c i d . d ) T u r m e r i c t u r n b a s e r e d . e ) P h e n o l p h t h a l e i n t u r n a c i d s p i n k . 1 8 . a ) H o w d o e l e p h a n t s l i v i n g i n t h e t r o p i c a l r a i n f o r e s t s a d a p t t h e m s e l v e s ? b ) H o w d o p o l a r b e a r s l i v i n g i n t h e p o l a r r e g i o n s a d a p t t h e m s e l v e s ? S e c t i o n B 1 9 . W h i c h o n e o f t h e f o l l o w i n g p l a c e i s u n l i k e l y t o b e a f f e c t e d b y a c y c l o n e ? a ) C h e n n a i b ) M a n g a l o r e c ) A m r i t s a r d ) P u r i 2 0 . A n i r o n b a l l a t 4 0 d e g r e e C e l s i u s i s d r o p p e d i n a m u g c o n t a i n i n g w a t e r a t 4 0 d e g r e e c e l c i u s . T h e h e a t w i l l : a ) F l o w f r o m i r o n b a l l t o w a t e r b ) N o t f l o w f r o m i r o n b a l l t o w a t e r o r f r o m w a t e r t o i r o n b a l l c ) F l o w f r o m w a t e r t o i r o n b a l l d ) I n c r e a s e t h e t e m p e r a t u r e o f b o t h 2 1 . S t a i n l e s s s t e e l p a n s a r e u s u a l l y p r o v i d e d w i t h c o p p e r b o t t o m s . T h e r e a s o n f o r t h i s c o u l d b e t h a t : a ) C o p p e r b o t t o m m a k e s t h e p a n m o r e d u r a b l e b ) S u c h p a n s a p p e a r c o l o u r f u l c ) C o p p e r i s a b e t t e r c o n d u c t o r o f h e a t t h a n s t a i n l e s s s t e e l d ) C o p p e r i s e a s i e r t o c l e a n t h a n s t a i n l e s s s t e e l 2 2 . W a t e r g e t s h e a t e d b y t h e p r o c e s s o f : a ) R a d i a t i o n b ) C o n d u c t i o n c ) C o n v e c t i o n d ) E v a p o r a t i o n 2 3 . L i c h e n s a r e a n e x a m p l e o f : a ) P a r a s i t e s b ) S a p o t r o p h s c ) S y m b i o t i c r e l a t i o n s h i p d ) I n s e c t i v o r o u s p l a n t 2 4 . B l o w u p t w o b a l l o o n s w i t h a l i t t l e w a t e r i n e a c h a n d t i e . H a n g t h e b a l l o o n s 8 - 1 0 c m a p a r t o n a s t i c k . B l o w i n t h e s p a c e b e t w e e n t h e b a l l o o n s . W h a t h a p p e n s ? a ) T h e b a l l o o n s s t i c k t o e a c h o t h e r b ) T h e b a l l o o n s m o v e a p a r t c ) N o c h a n g e i n p o s i t i o n o f b a l l o o n s d ) S o m e t i m e s t h e y m o v e a w a y a n d s o m e t i m e s s t i c k t o e a c h o t h e r 2 5 . C o m p l e t e d i g e s t i o n o f f o o d t a k e s p l a c e i n t h e : a ) S t o m a c h b ) L a r g e i n t e s t i n e c ) L i v e r d ) S m a l l i n t e s t i n e 2 6 . W a t e r f r o m t h e u n d i g e s t e d f o o d i s a b s o r b e d m a i n l y i n t h e : a ) S t o m a c h b ) F o o d p i p e c ) S m a l l i n t e s t i n e d ) L a r g e i n t e s t i n e 2 7 . W h i c h o p t i o n b e s t d e s c r i b e s a t r o p i c a l r e g i o n ? a ) H o t a n d h u m i d b ) M o d e r a t e t e m p e r a t u r e , h e a v y r a i n f a l l c ) C o l d a n d h u m i d d ) H o t a n d d r y 2 8 . P l a n t s t a k e c a r b o n d i o x i d e f r o m t h e a t m o s p h e r e m a i n l y t h r o u g h t h e i r : a ) R o o t s b ) S t e m c ) F l o w e r s d ) L e a v e s 2 9 . T h e p l a n t w h i c h t r a p s a n d f e e d s o n i n s e c t s i s : a ) C u s c u t a b ) C h i n a r o s e c ) P i t c h e r p l a n t d ) R o s e 3 0 . T h r o u g h w a s h i n g o f s h e a r e d s k i n o f s h e e p w i t h h a i r i s c a l l e d a ) S o r t i n g b ) S c o u r i n g c ) B r e e d i n g d ) R o l l i n g 3 1 . T h e n a t u r e o f w a t e r i s : a ) A c i d i c b ) B a s i c c ) N e u t r a l d ) M i l k y 3 2 . P e n g u i n s s t a y h u d d l e d t o g e t h e r t o : a ) S t a y t o g e t h e r b ) S t a y w a r m c ) B e f r i e n d s d ) H e l p e a c h o t h e r 3 3 . W h i c h o f t h e f o l l o w i n g d i s t a n c e - t i m e g r a p h s s h o w s a t r u c k m o v i n g w i t h a s p e e d w h i c h i s c o n s t a n t : ( a ) ( b ) ( c ) ( d )Read More
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FAQs on Class 7 Science: CBSE Past Year Paper - 12 - Science Class 7
| 1. What are the factors that cause air pollution? |  |
Ans. Air pollution is caused by various factors such as vehicle emissions, industrial activities, burning of fossil fuels, deforestation, and agricultural activities. These activities release harmful pollutants like carbon monoxide, sulfur dioxide, nitrogen oxides, and particulate matter into the air, leading to air pollution.
| 2. How does air pollution affect human health? | |
Ans. Air pollution can have severe health impacts on humans. Breathing in polluted air can lead to respiratory problems such as asthma, bronchitis, and lung cancer. It can also cause allergies, eye irritation, and cardiovascular diseases. Prolonged exposure to air pollution can weaken the immune system and increase the risk of developing chronic diseases.
| 3. What are the effects of air pollution on the environment? | |
Ans. Air pollution has detrimental effects on the environment. It contributes to global warming by increasing the levels of greenhouse gases in the atmosphere. It also leads to the formation of acid rain, which damages plants, trees, and aquatic life. Air pollution can harm ecosystems, disrupt the balance of nature, and reduce biodiversity.
| 4. How can we reduce air pollution? | |
Ans. There are several measures that can be taken to reduce air pollution. These include using cleaner fuels and technologies, promoting renewable energy sources, implementing strict emission standards for industries and vehicles, reducing deforestation, and adopting sustainable agricultural practices. Additionally, creating awareness among individuals about the importance of reducing air pollution can also play a significant role in mitigating this issue.
| 5. What is the role of individuals in combating air pollution? | |
Ans. Individuals can contribute to reducing air pollution by adopting eco-friendly practices in their daily lives. This includes using public transportation or carpooling instead of private vehicles, conserving energy, recycling and properly disposing of waste, planting trees, and avoiding the burning of waste or agricultural residues. By making conscious choices and spreading awareness, individuals can play a crucial role in combating air pollution and creating a cleaner environment.
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