Class 7 Exam > Class 7 Notes > Science Class 7 > Class 7 Science: CBSE Past Year Paper - 12
Class 7 Science: CBSE Past Year Paper - 12 | Science Class 7 PDF Download
| Download, print and study this document offline |
Please wait while the PDF view is loading
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
|
111 videos|246 docs|28 tests
|
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.
About this Document
|
4.96/5 Rating |
|
Nov 22, 2024 Last updated |
Document Description: Class 7 Science: CBSE Past Year Paper - 12 for Class 7 2024 is part of Science Class 7 preparation.
The notes and questions for Class 7 Science: CBSE Past Year Paper - 12 have been prepared according to the Class 7 exam syllabus. Information about Class 7 Science: CBSE Past Year Paper - 12 covers topics
like and Class 7 Science: CBSE Past Year Paper - 12 Example, for Class 7 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Class 7 Science: CBSE Past Year Paper - 12.
Introduction of Class 7 Science: CBSE Past Year Paper - 12 in English is available as part of our Science Class 7
for Class 7 & Class 7 Science: CBSE Past Year Paper - 12 in Hindi for Science Class 7 course.
Download more important topics related with notes, lectures and mock test series for Class 7
Exam by signing up for free. Class 7: Class 7 Science: CBSE Past Year Paper - 12 | Science Class 7
Description
Full syllabus notes, lecture & questions for Class 7 Science: CBSE Past Year Paper - 12 | Science Class 7 - Class 7 | Plus excerises question with solution to help you revise complete syllabus for Science Class 7 | Best notes, free PDF download
Information about Class 7 Science: CBSE Past Year Paper - 12
In this doc you can find the meaning of Class 7 Science: CBSE Past Year Paper - 12 defined & explained in the simplest way possible. Besides explaining types of
Class 7 Science: CBSE Past Year Paper - 12 theory, EduRev gives you an ample number of questions to practice Class 7 Science: CBSE Past Year Paper - 12 tests, examples and also practice Class 7
tests
|
Explore Courses for Class 7 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
Class 7 Science: CBSE Past Year Paper - 12 | Science Class 7
,Class 7 Science: CBSE Past Year Paper - 12 | Science Class 7
,past year papers
,Viva Questions
,shortcuts and tricks
,Semester Notes
,MCQs
,practice quizzes
,video lectures
,Class 7 Science: CBSE Past Year Paper - 12 | Science Class 7
,Summary
,Previous Year Questions with Solutions
,ppt
,Important questions
,Objective type Questions
,mock tests for examination
,Free
,Exam
,study material
,Sample Paper
,Extra Questions
;
Additional Information about Class 7 Science: CBSE Past Year Paper - 12 for Class 7 Preparation
Class 7 Science: CBSE Past Year Paper - 12 Free PDF Download
The Class 7 Science: CBSE Past Year Paper - 12 is an invaluable resource that delves deep into the core of the Class 7 exam.
These study notes are curated by experts and cover all the essential topics and concepts, making your preparation more efficient and effective.
With the help of these notes, you can grasp complex subjects quickly, revise important points easily,
and reinforce your understanding of key concepts. The study notes are presented in a concise and easy-to-understand manner,
allowing you to optimize your learning process. Whether you're looking for best-recommended books, sample papers, study material,
or toppers' notes, this PDF has got you covered. Download the Class 7 Science: CBSE Past Year Paper - 12 now and kickstart your journey towards success in the Class 7 exam.
Importance of Class 7 Science: CBSE Past Year Paper - 12
The importance of Class 7 Science: CBSE Past Year Paper - 12 cannot be overstated, especially for Class 7 aspirants.
This document holds the key to success in the Class 7 exam.
It offers a detailed understanding of the concept, providing invaluable insights into the topic.
By knowing the concepts well in advance, students can plan their preparation effectively.
Utilize this indispensable guide for a well-rounded preparation and achieve your desired results.
Class 7 Science: CBSE Past Year Paper - 12 Notes
Class 7 Science: CBSE Past Year Paper - 12 Notes offer in-depth insights into the specific topic to help you master it with ease.
This comprehensive document covers all aspects related to Class 7 Science: CBSE Past Year Paper - 12.
It includes detailed information about the exam syllabus, recommended books, and study materials for a well-rounded preparation.
Practice papers and question papers enable you to assess your progress effectively.
Additionally, the paper analysis provides valuable tips for tackling the exam strategically.
Access to Toppers' notes gives you an edge in understanding complex concepts.
Whether you're a beginner or aiming for advanced proficiency, Class 7 Science: CBSE Past Year Paper - 12 Notes on EduRev are your ultimate resource for success.
Class 7 Science: CBSE Past Year Paper - 12 Class 7 Questions
The "Class 7 Science: CBSE Past Year Paper - 12 Class 7 Questions" guide is a valuable resource for all aspiring students preparing for the
Class 7 exam. It focuses on providing a wide range of practice questions to help students gauge
their understanding of the exam topics. These questions cover the entire syllabus, ensuring comprehensive preparation.
The guide includes previous years' question papers for students to familiarize themselves with the exam's format and difficulty level.
Additionally, it offers subject-specific question banks, allowing students to focus on weak areas and improve their performance.
Study Class 7 Science: CBSE Past Year Paper - 12 on the App
Students of Class 7 can study Class 7 Science: CBSE Past Year Paper - 12 alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Class 7 Science: CBSE Past Year Paper - 12,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Class 7 Science: CBSE Past Year Paper - 12 is prepared as per the latest Class 7 syllabus.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup