Grade 11 Exam > Grade 11 Notes > Physics for Grade 11 > Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics
Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics | Physics for Grade 11 PDF Download
| Download, print and study this document offline |
Please wait while the PDF view is loading
Page 1 1 / 1 8 C B S E C l a s s X I P h y s i c s T i m e a l l o w e d : 3 h o u r s , M a x i m u m M a r k s : 7 0 G e n e r a l I n s t r u c t i o n s : 1 . A l l t h e q u e s t i o n s a r e c o m p u l s o r y . 2 . T h e r e a r e 2 6 q u e s t i o n s i n t o t a l . 3 . 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 . 4 . 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 . 5 . Q u e s t i o n s 1 1 t o 2 2 c a r r y t h r e e m a r k s e a c h . 6 . Q u e s t i o n s 2 3 i s v a l u e b a s e d q u e s t i o n s c a r r y f o u r m a r k s . 7 . Q u e s t i o n s 2 4 t o 2 6 c a r r y f i v e m a r k s e a c h . 8 . T h e r e i s n o o v e r a l l c h o i c e . H o w e v e r , a n i n t e r n a l c h o i c e h a s b e e n p r o v i d e d i n o n e q u e s t i o n o f t w o m a r k s , o n e q u e s t i o n o f t h r e e m a r k s a n d a l l t h r e e q u e s t i o n s i n f i v e m a r k s e a c h . Y o u h a v e t o a t t e m p t o n l y o n e o f t h e c h o i c e s i n s u c h q u e s t i o n s . 9 . U s e o f c a l c u l a t o r s i s n o t p e r m i t t e d . H o w e v e r , y o u m a y u s e l o g t a b l e s i f n e c e s s a r y . 1 0 . Y o u m a y u s e t h e f o l l o w i n g v a l u e s o f p h y s i c a l c o n s t a n t s w h e r e v e r n e c e s s a r y : , , , , , 1 . I f o n e m a s s o f o n e e l e c t r o n i s 9 . 1 1 x 1 0 - 3 1 k g , t h e n h o w m a n y e l e c t r o n s w o u l d w e i g h i n 1 k g ? A n s . 9 . 1 1 x 1 0 - 3 1 x n = 1 k g T h e r e f o r e , n = 1 . 1 x 1 0 3 0 2 . W h a t d o y o u u n d e r s t a n d b y t h e t e r m c o n s e r v a t i v e f o r c e ? A n s . A n y f o r c e i s c a l l e d c o n s e r v a t i v e f o r c e i f , a ) W o r k d o n e a g a i n s t i s i n d e p e n d e n t o f p a t h . b ) W o r k d o n e i n a c l o s e d p a t h i s z e r o . Page 2 1 / 1 8 C B S E C l a s s X I P h y s i c s T i m e a l l o w e d : 3 h o u r s , M a x i m u m M a r k s : 7 0 G e n e r a l I n s t r u c t i o n s : 1 . A l l t h e q u e s t i o n s a r e c o m p u l s o r y . 2 . T h e r e a r e 2 6 q u e s t i o n s i n t o t a l . 3 . 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 . 4 . 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 . 5 . Q u e s t i o n s 1 1 t o 2 2 c a r r y t h r e e m a r k s e a c h . 6 . Q u e s t i o n s 2 3 i s v a l u e b a s e d q u e s t i o n s c a r r y f o u r m a r k s . 7 . Q u e s t i o n s 2 4 t o 2 6 c a r r y f i v e m a r k s e a c h . 8 . T h e r e i s n o o v e r a l l c h o i c e . H o w e v e r , a n i n t e r n a l c h o i c e h a s b e e n p r o v i d e d i n o n e q u e s t i o n o f t w o m a r k s , o n e q u e s t i o n o f t h r e e m a r k s a n d a l l t h r e e q u e s t i o n s i n f i v e m a r k s e a c h . Y o u h a v e t o a t t e m p t o n l y o n e o f t h e c h o i c e s i n s u c h q u e s t i o n s . 9 . U s e o f c a l c u l a t o r s i s n o t p e r m i t t e d . H o w e v e r , y o u m a y u s e l o g t a b l e s i f n e c e s s a r y . 1 0 . Y o u m a y u s e t h e f o l l o w i n g v a l u e s o f p h y s i c a l c o n s t a n t s w h e r e v e r n e c e s s a r y : , , , , , 1 . I f o n e m a s s o f o n e e l e c t r o n i s 9 . 1 1 x 1 0 - 3 1 k g , t h e n h o w m a n y e l e c t r o n s w o u l d w e i g h i n 1 k g ? A n s . 9 . 1 1 x 1 0 - 3 1 x n = 1 k g T h e r e f o r e , n = 1 . 1 x 1 0 3 0 2 . W h a t d o y o u u n d e r s t a n d b y t h e t e r m c o n s e r v a t i v e f o r c e ? A n s . A n y f o r c e i s c a l l e d c o n s e r v a t i v e f o r c e i f , a ) W o r k d o n e a g a i n s t i s i n d e p e n d e n t o f p a t h . b ) W o r k d o n e i n a c l o s e d p a t h i s z e r o . 2 / 1 8 3 . G i v e r e a s o n : “ L i q u i d s e t i n r o t a t i o n c o m e s t o r e s t a f t e r s o m e l i n e ” . A n s . T h e l i q u i d c o m e s t o r e s t d u e t o t h e v i s c o u s f o r c e , d u e t o i n t e r n a l f l u i d f r i c t i o n b e t w e e n i t s d i f f e r e n t l a y e r s . 4 . W h a t i s t h e n u m b e r o f d e g r e e o f f r e e d o m o f a m o l e c u l e o f a d i a t o m i c g a s a t r o o m t e m p e r a t u r e ? A n s . A m o l e c u l e o f d i a t o m i c g a s p o s s e s s e s f i v e d e g r e e s o f f r e e d o m a t r o o m t e m p e r a t u r e w h i c h i s d u e t o t r a n s l a t i o n a l m o t i o n a n d r o t a t i o n a l m o t i o n . 5 . W h a t i s t h e s l o p e o f s t r e s s - s t r a i n b o d y w i t h i n t h e e l a s t i c l i m i t ? A n s . W i t h i n e l a s t i c l i m i t , t h e s l o p e o f s t r e s s - s t r a i n c u r v e g i v e s t h e v a l u e o f m o d u l u s o f e l a s t i c i t y o f t h e g i v e n m a t e r i a l . 6 . I f t h e v e l o c i t y a t t h e m a x i m u m h e i g h t o f a p r o j e c t i l e i s h a l f i t s i n i t i a l v e l o c i t y o f p r o j e c t i o n u , t h e n f i n d i t s r a n g e o n t h e h o r i z o n t a l p l a n e . A n s . c o s = = 6 0 0 H o r i z o n t a l r a n g e = R = 7 . W h a t f r a c t i o n o f i t s m e c h a n i c a l e n e r g y i s l o s t i n e a c h b o u n c e , i f a b a l l b o u n c e s t o 8 0 % o f i t s o r i g i n a l h e i g h t ? A n s . L e t t h e b a l l f a l l f r o m h e i g h t h t h e n , K i n e t i c e n e r g y o f b a l l a t t h e t i m e o f j u s t s t r i k i n g t h e g r o u n d = P o t e n t i a l e n e r g y o f b a l l a t h e i g h t h , K = m g h S i m i l a r l y , o n r e b o u n d i n g t h e b a l l m o v e s t o a m a x i m u m h e i g h t h ’ , t h e n k i n e t i c e n e r g y w i l l b e K ’ = m g h ’ L o s s o f k i n e t i c e n e r g y K – K ’ = m g h – m g h ’ = m g ( h – h ’ ) = m g ( h – 8 0 / 1 0 0 h ) = m g h x ( 0 . 2 ) F r a c t i o n a l l o s s i n K . E . o f b a l l i n e a c h r e - b o u n c e = K – K ’ / K = m g h x ( 0 . 2 ) / m g h = 0 . 2 Page 3 1 / 1 8 C B S E C l a s s X I P h y s i c s T i m e a l l o w e d : 3 h o u r s , M a x i m u m M a r k s : 7 0 G e n e r a l I n s t r u c t i o n s : 1 . A l l t h e q u e s t i o n s a r e c o m p u l s o r y . 2 . T h e r e a r e 2 6 q u e s t i o n s i n t o t a l . 3 . 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 . 4 . 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 . 5 . Q u e s t i o n s 1 1 t o 2 2 c a r r y t h r e e m a r k s e a c h . 6 . Q u e s t i o n s 2 3 i s v a l u e b a s e d q u e s t i o n s c a r r y f o u r m a r k s . 7 . Q u e s t i o n s 2 4 t o 2 6 c a r r y f i v e m a r k s e a c h . 8 . T h e r e i s n o o v e r a l l c h o i c e . H o w e v e r , a n i n t e r n a l c h o i c e h a s b e e n p r o v i d e d i n o n e q u e s t i o n o f t w o m a r k s , o n e q u e s t i o n o f t h r e e m a r k s a n d a l l t h r e e q u e s t i o n s i n f i v e m a r k s e a c h . Y o u h a v e t o a t t e m p t o n l y o n e o f t h e c h o i c e s i n s u c h q u e s t i o n s . 9 . U s e o f c a l c u l a t o r s i s n o t p e r m i t t e d . H o w e v e r , y o u m a y u s e l o g t a b l e s i f n e c e s s a r y . 1 0 . Y o u m a y u s e t h e f o l l o w i n g v a l u e s o f p h y s i c a l c o n s t a n t s w h e r e v e r n e c e s s a r y : , , , , , 1 . I f o n e m a s s o f o n e e l e c t r o n i s 9 . 1 1 x 1 0 - 3 1 k g , t h e n h o w m a n y e l e c t r o n s w o u l d w e i g h i n 1 k g ? A n s . 9 . 1 1 x 1 0 - 3 1 x n = 1 k g T h e r e f o r e , n = 1 . 1 x 1 0 3 0 2 . W h a t d o y o u u n d e r s t a n d b y t h e t e r m c o n s e r v a t i v e f o r c e ? A n s . A n y f o r c e i s c a l l e d c o n s e r v a t i v e f o r c e i f , a ) W o r k d o n e a g a i n s t i s i n d e p e n d e n t o f p a t h . b ) W o r k d o n e i n a c l o s e d p a t h i s z e r o . 2 / 1 8 3 . G i v e r e a s o n : “ L i q u i d s e t i n r o t a t i o n c o m e s t o r e s t a f t e r s o m e l i n e ” . A n s . T h e l i q u i d c o m e s t o r e s t d u e t o t h e v i s c o u s f o r c e , d u e t o i n t e r n a l f l u i d f r i c t i o n b e t w e e n i t s d i f f e r e n t l a y e r s . 4 . W h a t i s t h e n u m b e r o f d e g r e e o f f r e e d o m o f a m o l e c u l e o f a d i a t o m i c g a s a t r o o m t e m p e r a t u r e ? A n s . A m o l e c u l e o f d i a t o m i c g a s p o s s e s s e s f i v e d e g r e e s o f f r e e d o m a t r o o m t e m p e r a t u r e w h i c h i s d u e t o t r a n s l a t i o n a l m o t i o n a n d r o t a t i o n a l m o t i o n . 5 . W h a t i s t h e s l o p e o f s t r e s s - s t r a i n b o d y w i t h i n t h e e l a s t i c l i m i t ? A n s . W i t h i n e l a s t i c l i m i t , t h e s l o p e o f s t r e s s - s t r a i n c u r v e g i v e s t h e v a l u e o f m o d u l u s o f e l a s t i c i t y o f t h e g i v e n m a t e r i a l . 6 . I f t h e v e l o c i t y a t t h e m a x i m u m h e i g h t o f a p r o j e c t i l e i s h a l f i t s i n i t i a l v e l o c i t y o f p r o j e c t i o n u , t h e n f i n d i t s r a n g e o n t h e h o r i z o n t a l p l a n e . A n s . c o s = = 6 0 0 H o r i z o n t a l r a n g e = R = 7 . W h a t f r a c t i o n o f i t s m e c h a n i c a l e n e r g y i s l o s t i n e a c h b o u n c e , i f a b a l l b o u n c e s t o 8 0 % o f i t s o r i g i n a l h e i g h t ? A n s . L e t t h e b a l l f a l l f r o m h e i g h t h t h e n , K i n e t i c e n e r g y o f b a l l a t t h e t i m e o f j u s t s t r i k i n g t h e g r o u n d = P o t e n t i a l e n e r g y o f b a l l a t h e i g h t h , K = m g h S i m i l a r l y , o n r e b o u n d i n g t h e b a l l m o v e s t o a m a x i m u m h e i g h t h ’ , t h e n k i n e t i c e n e r g y w i l l b e K ’ = m g h ’ L o s s o f k i n e t i c e n e r g y K – K ’ = m g h – m g h ’ = m g ( h – h ’ ) = m g ( h – 8 0 / 1 0 0 h ) = m g h x ( 0 . 2 ) F r a c t i o n a l l o s s i n K . E . o f b a l l i n e a c h r e - b o u n c e = K – K ’ / K = m g h x ( 0 . 2 ) / m g h = 0 . 2 3 / 1 8 = 0 . 2 x 1 0 0 % = 2 0 % 8 . W h a t i s t h e e r r o r i n t h e e s t i m a t i o n o f g i f t h e l e n g t h a n d t i m e p e r i o d o f a n o s c i l l a t i n g p e n d u l u m h a v e e r r o r s o f 1 % a n d 2 % ? A n s . % o f e r r o r i n g = 1 % + 2 x 2 % = 5 % 9 . G i v e r e a s o n : “ O n e s h o u l d t a k e s h o r t s t e p s r a t h e r t h a n l o n g s t e p s w h e n w a l k i n g o n i c e ” . A n s . L e t R r e p r e s e n t s t h e r e a c t i o n o f f e r e d b y t h e g r o u n d . T h e v e r t i c a l c o m p o n e n t R c o s w i l l b a l a n c e t h e w e i g h t o f t h e p e r s o n a n d t h e h o r i z o n t a l c o m p o n e n t R s i n w i l l h e l p t h e p e r s o n t o w a l k f o r w a r d . N o r m a l r e a c t i o n = R c o s F r i c t i o n f o r c e = R s i n C o e f f i c i e n t o f f r i c t i o n I n a l o n g s t e p , i s m o r e a n d t a n i s m o r e . B u t µ h a s a f i x e d v a l u e . S o , t h e r e i s d a n g e r o f s h i p p i n g i n a l o n g s t e p . 1 0 . A s o l i d s p h e r e o f r a d i u s 1 0 c m i s s u b j e c t e d t o a u n i f o r m p r e s s u r e e q u a l t o 5 x 1 0 8 N m - 2 . C a l c u l a t e t h e c h a n g e i n v o l u m e . [ G i v e n : B u l k m o d u l u s o f t h e m a t e r i a l o f t h e s p h e r e i s 3 . 1 4 x 1 0 1 1 N m - 2 ] O r Page 4 1 / 1 8 C B S E C l a s s X I P h y s i c s T i m e a l l o w e d : 3 h o u r s , M a x i m u m M a r k s : 7 0 G e n e r a l I n s t r u c t i o n s : 1 . A l l t h e q u e s t i o n s a r e c o m p u l s o r y . 2 . T h e r e a r e 2 6 q u e s t i o n s i n t o t a l . 3 . 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 . 4 . 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 . 5 . Q u e s t i o n s 1 1 t o 2 2 c a r r y t h r e e m a r k s e a c h . 6 . Q u e s t i o n s 2 3 i s v a l u e b a s e d q u e s t i o n s c a r r y f o u r m a r k s . 7 . Q u e s t i o n s 2 4 t o 2 6 c a r r y f i v e m a r k s e a c h . 8 . T h e r e i s n o o v e r a l l c h o i c e . H o w e v e r , a n i n t e r n a l c h o i c e h a s b e e n p r o v i d e d i n o n e q u e s t i o n o f t w o m a r k s , o n e q u e s t i o n o f t h r e e m a r k s a n d a l l t h r e e q u e s t i o n s i n f i v e m a r k s e a c h . Y o u h a v e t o a t t e m p t o n l y o n e o f t h e c h o i c e s i n s u c h q u e s t i o n s . 9 . U s e o f c a l c u l a t o r s i s n o t p e r m i t t e d . H o w e v e r , y o u m a y u s e l o g t a b l e s i f n e c e s s a r y . 1 0 . Y o u m a y u s e t h e f o l l o w i n g v a l u e s o f p h y s i c a l c o n s t a n t s w h e r e v e r n e c e s s a r y : , , , , , 1 . I f o n e m a s s o f o n e e l e c t r o n i s 9 . 1 1 x 1 0 - 3 1 k g , t h e n h o w m a n y e l e c t r o n s w o u l d w e i g h i n 1 k g ? A n s . 9 . 1 1 x 1 0 - 3 1 x n = 1 k g T h e r e f o r e , n = 1 . 1 x 1 0 3 0 2 . W h a t d o y o u u n d e r s t a n d b y t h e t e r m c o n s e r v a t i v e f o r c e ? A n s . A n y f o r c e i s c a l l e d c o n s e r v a t i v e f o r c e i f , a ) W o r k d o n e a g a i n s t i s i n d e p e n d e n t o f p a t h . b ) W o r k d o n e i n a c l o s e d p a t h i s z e r o . 2 / 1 8 3 . G i v e r e a s o n : “ L i q u i d s e t i n r o t a t i o n c o m e s t o r e s t a f t e r s o m e l i n e ” . A n s . T h e l i q u i d c o m e s t o r e s t d u e t o t h e v i s c o u s f o r c e , d u e t o i n t e r n a l f l u i d f r i c t i o n b e t w e e n i t s d i f f e r e n t l a y e r s . 4 . W h a t i s t h e n u m b e r o f d e g r e e o f f r e e d o m o f a m o l e c u l e o f a d i a t o m i c g a s a t r o o m t e m p e r a t u r e ? A n s . A m o l e c u l e o f d i a t o m i c g a s p o s s e s s e s f i v e d e g r e e s o f f r e e d o m a t r o o m t e m p e r a t u r e w h i c h i s d u e t o t r a n s l a t i o n a l m o t i o n a n d r o t a t i o n a l m o t i o n . 5 . W h a t i s t h e s l o p e o f s t r e s s - s t r a i n b o d y w i t h i n t h e e l a s t i c l i m i t ? A n s . W i t h i n e l a s t i c l i m i t , t h e s l o p e o f s t r e s s - s t r a i n c u r v e g i v e s t h e v a l u e o f m o d u l u s o f e l a s t i c i t y o f t h e g i v e n m a t e r i a l . 6 . I f t h e v e l o c i t y a t t h e m a x i m u m h e i g h t o f a p r o j e c t i l e i s h a l f i t s i n i t i a l v e l o c i t y o f p r o j e c t i o n u , t h e n f i n d i t s r a n g e o n t h e h o r i z o n t a l p l a n e . A n s . c o s = = 6 0 0 H o r i z o n t a l r a n g e = R = 7 . W h a t f r a c t i o n o f i t s m e c h a n i c a l e n e r g y i s l o s t i n e a c h b o u n c e , i f a b a l l b o u n c e s t o 8 0 % o f i t s o r i g i n a l h e i g h t ? A n s . L e t t h e b a l l f a l l f r o m h e i g h t h t h e n , K i n e t i c e n e r g y o f b a l l a t t h e t i m e o f j u s t s t r i k i n g t h e g r o u n d = P o t e n t i a l e n e r g y o f b a l l a t h e i g h t h , K = m g h S i m i l a r l y , o n r e b o u n d i n g t h e b a l l m o v e s t o a m a x i m u m h e i g h t h ’ , t h e n k i n e t i c e n e r g y w i l l b e K ’ = m g h ’ L o s s o f k i n e t i c e n e r g y K – K ’ = m g h – m g h ’ = m g ( h – h ’ ) = m g ( h – 8 0 / 1 0 0 h ) = m g h x ( 0 . 2 ) F r a c t i o n a l l o s s i n K . E . o f b a l l i n e a c h r e - b o u n c e = K – K ’ / K = m g h x ( 0 . 2 ) / m g h = 0 . 2 3 / 1 8 = 0 . 2 x 1 0 0 % = 2 0 % 8 . W h a t i s t h e e r r o r i n t h e e s t i m a t i o n o f g i f t h e l e n g t h a n d t i m e p e r i o d o f a n o s c i l l a t i n g p e n d u l u m h a v e e r r o r s o f 1 % a n d 2 % ? A n s . % o f e r r o r i n g = 1 % + 2 x 2 % = 5 % 9 . G i v e r e a s o n : “ O n e s h o u l d t a k e s h o r t s t e p s r a t h e r t h a n l o n g s t e p s w h e n w a l k i n g o n i c e ” . A n s . L e t R r e p r e s e n t s t h e r e a c t i o n o f f e r e d b y t h e g r o u n d . T h e v e r t i c a l c o m p o n e n t R c o s w i l l b a l a n c e t h e w e i g h t o f t h e p e r s o n a n d t h e h o r i z o n t a l c o m p o n e n t R s i n w i l l h e l p t h e p e r s o n t o w a l k f o r w a r d . N o r m a l r e a c t i o n = R c o s F r i c t i o n f o r c e = R s i n C o e f f i c i e n t o f f r i c t i o n I n a l o n g s t e p , i s m o r e a n d t a n i s m o r e . B u t µ h a s a f i x e d v a l u e . S o , t h e r e i s d a n g e r o f s h i p p i n g i n a l o n g s t e p . 1 0 . A s o l i d s p h e r e o f r a d i u s 1 0 c m i s s u b j e c t e d t o a u n i f o r m p r e s s u r e e q u a l t o 5 x 1 0 8 N m - 2 . C a l c u l a t e t h e c h a n g e i n v o l u m e . [ G i v e n : B u l k m o d u l u s o f t h e m a t e r i a l o f t h e s p h e r e i s 3 . 1 4 x 1 0 1 1 N m - 2 ] O r 4 / 1 8 A g r o u p o f b o y s w e n t f o r b o a t i n g a s a p i c n i c . T h e y w e r e d a n c i n g a n d s i n g i n g . S u d d e n l y , t h e i r b o a t l o s t i t s b a l a n c e a n d t h e b o y s f e l l i n t o t h e r i v e r . B y s e e i n g t h i s , m a n y f i s h e r m e n r u s h e d f o r t h e i r h e l p a n d p r o v i d e d t h e m p i e c e s o f w o o d s o t h a t t h e y c o u l d f l o a t a n d s a v e t h e m s e l v e s . T h e a l e r t n e s s o f t h e f i s h e r m e n s a v e d t h e l i f e o f a l l t h e b o y s . a ) W h a t w o u l d b e t h e d e n s i t y o f w a t e r i f t h e b o y s s a v e d t h e m s e l v e s w i t h a w o o d t h a t f l o a t s w i t h 1 / 4 t h o f i t s v o l u m e a b o v e t h e w a t e r s u r f a c e ? b ) W h a t i s t h e u s e o f l i f e s a v i n g j a c k e t s w h i l e g o i n g o n a b o a t ? A n s . P = 5 x 1 0 8 N m - 2 O r a ) H e r e , V o l u m e o f w o o d b o d y o u t s i d e w a t e r = V / 4 V o l u m e o f w o o d b o d y i n s i d e w a t e r = N o w , w e i g h t o f w a t e r d i s p l a c e d b y w o o d = T h e r e f o r e , V ? g = T h e n , ? = 7 5 0 k g / m 3 b ) T h i s i s b e c a u s e t h e l i v e s s a v i n g j a c k e t s h a v e a i r i n t h e m w h i c h k e e p s u s a f l o a t i f w e a c c i d e n t l y f a l l i n t o w a t e r . 1 1 . A c y l i n d e r i s s u s p e n d e d b y t o s t r i n g s w r a p p e d a r o u n d t h e c y l i n d e r n e a r e a c h e n d , t h e f r e e e n d s o f t h e S t r i n g b e i n g a t t a c h e d t o h o o k s o n t h e c e i l i n g , s u c h t h a t t h e l e n g t h o f t h e c y l i n d e r i s h o r i z o n t a l . F r o m t h e p o s i t i o n o f r e s t , t h e c y l i n d e r i s a l l o w e d t o r o l l d o w n a s s u s p e n s i o n s t r i n g s u n w i n d . C a l c u l a t e , a ) T h e d o w n w a r d l i n e a r a c c e l e r a t i o n o f t h e c y l i n d e r . b ) T h e t e n s i o n i n t h e 1 2 k g . A n s . Page 5 1 / 1 8 C B S E C l a s s X I P h y s i c s T i m e a l l o w e d : 3 h o u r s , M a x i m u m M a r k s : 7 0 G e n e r a l I n s t r u c t i o n s : 1 . A l l t h e q u e s t i o n s a r e c o m p u l s o r y . 2 . T h e r e a r e 2 6 q u e s t i o n s i n t o t a l . 3 . 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 . 4 . 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 . 5 . Q u e s t i o n s 1 1 t o 2 2 c a r r y t h r e e m a r k s e a c h . 6 . Q u e s t i o n s 2 3 i s v a l u e b a s e d q u e s t i o n s c a r r y f o u r m a r k s . 7 . Q u e s t i o n s 2 4 t o 2 6 c a r r y f i v e m a r k s e a c h . 8 . T h e r e i s n o o v e r a l l c h o i c e . H o w e v e r , a n i n t e r n a l c h o i c e h a s b e e n p r o v i d e d i n o n e q u e s t i o n o f t w o m a r k s , o n e q u e s t i o n o f t h r e e m a r k s a n d a l l t h r e e q u e s t i o n s i n f i v e m a r k s e a c h . Y o u h a v e t o a t t e m p t o n l y o n e o f t h e c h o i c e s i n s u c h q u e s t i o n s . 9 . U s e o f c a l c u l a t o r s i s n o t p e r m i t t e d . H o w e v e r , y o u m a y u s e l o g t a b l e s i f n e c e s s a r y . 1 0 . Y o u m a y u s e t h e f o l l o w i n g v a l u e s o f p h y s i c a l c o n s t a n t s w h e r e v e r n e c e s s a r y : , , , , , 1 . I f o n e m a s s o f o n e e l e c t r o n i s 9 . 1 1 x 1 0 - 3 1 k g , t h e n h o w m a n y e l e c t r o n s w o u l d w e i g h i n 1 k g ? A n s . 9 . 1 1 x 1 0 - 3 1 x n = 1 k g T h e r e f o r e , n = 1 . 1 x 1 0 3 0 2 . W h a t d o y o u u n d e r s t a n d b y t h e t e r m c o n s e r v a t i v e f o r c e ? A n s . A n y f o r c e i s c a l l e d c o n s e r v a t i v e f o r c e i f , a ) W o r k d o n e a g a i n s t i s i n d e p e n d e n t o f p a t h . b ) W o r k d o n e i n a c l o s e d p a t h i s z e r o . 2 / 1 8 3 . G i v e r e a s o n : “ L i q u i d s e t i n r o t a t i o n c o m e s t o r e s t a f t e r s o m e l i n e ” . A n s . T h e l i q u i d c o m e s t o r e s t d u e t o t h e v i s c o u s f o r c e , d u e t o i n t e r n a l f l u i d f r i c t i o n b e t w e e n i t s d i f f e r e n t l a y e r s . 4 . W h a t i s t h e n u m b e r o f d e g r e e o f f r e e d o m o f a m o l e c u l e o f a d i a t o m i c g a s a t r o o m t e m p e r a t u r e ? A n s . A m o l e c u l e o f d i a t o m i c g a s p o s s e s s e s f i v e d e g r e e s o f f r e e d o m a t r o o m t e m p e r a t u r e w h i c h i s d u e t o t r a n s l a t i o n a l m o t i o n a n d r o t a t i o n a l m o t i o n . 5 . W h a t i s t h e s l o p e o f s t r e s s - s t r a i n b o d y w i t h i n t h e e l a s t i c l i m i t ? A n s . W i t h i n e l a s t i c l i m i t , t h e s l o p e o f s t r e s s - s t r a i n c u r v e g i v e s t h e v a l u e o f m o d u l u s o f e l a s t i c i t y o f t h e g i v e n m a t e r i a l . 6 . I f t h e v e l o c i t y a t t h e m a x i m u m h e i g h t o f a p r o j e c t i l e i s h a l f i t s i n i t i a l v e l o c i t y o f p r o j e c t i o n u , t h e n f i n d i t s r a n g e o n t h e h o r i z o n t a l p l a n e . A n s . c o s = = 6 0 0 H o r i z o n t a l r a n g e = R = 7 . W h a t f r a c t i o n o f i t s m e c h a n i c a l e n e r g y i s l o s t i n e a c h b o u n c e , i f a b a l l b o u n c e s t o 8 0 % o f i t s o r i g i n a l h e i g h t ? A n s . L e t t h e b a l l f a l l f r o m h e i g h t h t h e n , K i n e t i c e n e r g y o f b a l l a t t h e t i m e o f j u s t s t r i k i n g t h e g r o u n d = P o t e n t i a l e n e r g y o f b a l l a t h e i g h t h , K = m g h S i m i l a r l y , o n r e b o u n d i n g t h e b a l l m o v e s t o a m a x i m u m h e i g h t h ’ , t h e n k i n e t i c e n e r g y w i l l b e K ’ = m g h ’ L o s s o f k i n e t i c e n e r g y K – K ’ = m g h – m g h ’ = m g ( h – h ’ ) = m g ( h – 8 0 / 1 0 0 h ) = m g h x ( 0 . 2 ) F r a c t i o n a l l o s s i n K . E . o f b a l l i n e a c h r e - b o u n c e = K – K ’ / K = m g h x ( 0 . 2 ) / m g h = 0 . 2 3 / 1 8 = 0 . 2 x 1 0 0 % = 2 0 % 8 . W h a t i s t h e e r r o r i n t h e e s t i m a t i o n o f g i f t h e l e n g t h a n d t i m e p e r i o d o f a n o s c i l l a t i n g p e n d u l u m h a v e e r r o r s o f 1 % a n d 2 % ? A n s . % o f e r r o r i n g = 1 % + 2 x 2 % = 5 % 9 . G i v e r e a s o n : “ O n e s h o u l d t a k e s h o r t s t e p s r a t h e r t h a n l o n g s t e p s w h e n w a l k i n g o n i c e ” . A n s . L e t R r e p r e s e n t s t h e r e a c t i o n o f f e r e d b y t h e g r o u n d . T h e v e r t i c a l c o m p o n e n t R c o s w i l l b a l a n c e t h e w e i g h t o f t h e p e r s o n a n d t h e h o r i z o n t a l c o m p o n e n t R s i n w i l l h e l p t h e p e r s o n t o w a l k f o r w a r d . N o r m a l r e a c t i o n = R c o s F r i c t i o n f o r c e = R s i n C o e f f i c i e n t o f f r i c t i o n I n a l o n g s t e p , i s m o r e a n d t a n i s m o r e . B u t µ h a s a f i x e d v a l u e . S o , t h e r e i s d a n g e r o f s h i p p i n g i n a l o n g s t e p . 1 0 . A s o l i d s p h e r e o f r a d i u s 1 0 c m i s s u b j e c t e d t o a u n i f o r m p r e s s u r e e q u a l t o 5 x 1 0 8 N m - 2 . C a l c u l a t e t h e c h a n g e i n v o l u m e . [ G i v e n : B u l k m o d u l u s o f t h e m a t e r i a l o f t h e s p h e r e i s 3 . 1 4 x 1 0 1 1 N m - 2 ] O r 4 / 1 8 A g r o u p o f b o y s w e n t f o r b o a t i n g a s a p i c n i c . T h e y w e r e d a n c i n g a n d s i n g i n g . S u d d e n l y , t h e i r b o a t l o s t i t s b a l a n c e a n d t h e b o y s f e l l i n t o t h e r i v e r . B y s e e i n g t h i s , m a n y f i s h e r m e n r u s h e d f o r t h e i r h e l p a n d p r o v i d e d t h e m p i e c e s o f w o o d s o t h a t t h e y c o u l d f l o a t a n d s a v e t h e m s e l v e s . T h e a l e r t n e s s o f t h e f i s h e r m e n s a v e d t h e l i f e o f a l l t h e b o y s . a ) W h a t w o u l d b e t h e d e n s i t y o f w a t e r i f t h e b o y s s a v e d t h e m s e l v e s w i t h a w o o d t h a t f l o a t s w i t h 1 / 4 t h o f i t s v o l u m e a b o v e t h e w a t e r s u r f a c e ? b ) W h a t i s t h e u s e o f l i f e s a v i n g j a c k e t s w h i l e g o i n g o n a b o a t ? A n s . P = 5 x 1 0 8 N m - 2 O r a ) H e r e , V o l u m e o f w o o d b o d y o u t s i d e w a t e r = V / 4 V o l u m e o f w o o d b o d y i n s i d e w a t e r = N o w , w e i g h t o f w a t e r d i s p l a c e d b y w o o d = T h e r e f o r e , V ? g = T h e n , ? = 7 5 0 k g / m 3 b ) T h i s i s b e c a u s e t h e l i v e s s a v i n g j a c k e t s h a v e a i r i n t h e m w h i c h k e e p s u s a f l o a t i f w e a c c i d e n t l y f a l l i n t o w a t e r . 1 1 . A c y l i n d e r i s s u s p e n d e d b y t o s t r i n g s w r a p p e d a r o u n d t h e c y l i n d e r n e a r e a c h e n d , t h e f r e e e n d s o f t h e S t r i n g b e i n g a t t a c h e d t o h o o k s o n t h e c e i l i n g , s u c h t h a t t h e l e n g t h o f t h e c y l i n d e r i s h o r i z o n t a l . F r o m t h e p o s i t i o n o f r e s t , t h e c y l i n d e r i s a l l o w e d t o r o l l d o w n a s s u s p e n s i o n s t r i n g s u n w i n d . C a l c u l a t e , a ) T h e d o w n w a r d l i n e a r a c c e l e r a t i o n o f t h e c y l i n d e r . b ) T h e t e n s i o n i n t h e 1 2 k g . A n s . 5 / 1 8 L e t t h e d o w n w a r d l i n e a r a c c e l e r a t i o n o f t h e c y l i n d e r b e a . i f M b e t h e m a s s o f t h e c y l i n d e r t h e n M g – 2 T = M a T = ½ m ( g – a ) - - - - - - - - - - - - - - - - - - - - - - - - - ( i ) T o r q u e = m o m e n t o f i n e r t i a x a n g u l a r a c c e l e r a t i o n 2 T r = I a 2 T r = ½ m r 2 x ( a / r ) T = m a / 4 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ( i i ) F r o m e q u a t i o n ( i ) a n d ( i i ) , m a / 4 = ½ m ( g – a ) - - - - - - - - - - - - - - - - - - - - - - ( i i i ) S o l v i n g e q u a t i o n ( i ) a n d ( i i i ) S u b s t i t u t i n g t h e v a l u e o f a i n e q u a t i o n ( i i ) w e g e t , 1 2 . A n o b j e c t w e i g h i n g 7 0 k g i s k e p t i n a l i f t . F i n d i t s w e i g h t a s a r e c o r d e d b y a s p r i n g b a l a n c e w h e n t h e l i f t a ) M o v e s u p w a r d s w i t h a u n i f o r m v e l o c i t y o f m s - 1 b ) M o v e s u p w a r d s w i t h a u n i f o r m a c c e l e r a t i o n o f 2 . 2 m s - 2 c ) M o v e s d o w n w a r d s w i t h a u n i f o r m a c c e l e r a t i o n o f 2 . 8 m s - 2 d ) F a l l s f r e e l y u n d e r g r a v i t y O r A b o d y o f m a s s 2 k g i s a t r e s t a t a h e i g h t o f 1 0 m a b o v e t h e g r o u n d .Read More
|
83 videos|257 docs|174 tests
|
FAQs on Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics - Physics for Grade 11
| 1. How can I find the NEET physics past year paper for Class 11? |  |
Ans. You can find the NEET physics past year paper for Class 11 on various educational websites, online forums, and official NEET websites. These papers are often available for free download in PDF format.
| 2. What is the importance of solving past year papers for NEET physics? | |
Ans. Solving past year papers for NEET physics is crucial as it helps you understand the exam pattern, familiarize yourself with the types of questions asked, and assess your preparation level. It also helps in identifying weak areas that need improvement and enhances time management skills.
| 3. How should I approach the physics section in the NEET exam? | |
Ans. To approach the physics section in the NEET exam, it is important to have a clear understanding of the concepts and formulas. Practice solving a variety of problems from different topics to improve problem-solving skills. Focus on understanding the underlying principles rather than rote memorization.
| 4. Are numerical problems more important than theory in NEET physics? | |
Ans. Both numerical problems and theory hold equal importance in NEET physics. While numerical problems test your understanding and application of concepts, theory questions assess your knowledge and conceptual clarity. It is essential to have a balance between theory and numerical practice to excel in the physics section.
| 5. How can I manage time effectively during the NEET physics exam? | |
Ans. Time management is crucial during the NEET physics exam. Start by solving easier questions first to gain confidence and save time for challenging ones. Divide your time according to the number of questions and set a time limit for each. Avoid spending too much time on a single question and come back to it later if needed. Regular practice and mock tests can help improve time management skills.
Related Exams
About this Document
|
4.76/5 Rating |
|
Dec 23, 2024 Last updated |
Document Description: Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics for Grade 11 2024 is part of Physics for Grade 11 preparation.
The notes and questions for Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics have been prepared according to the Grade 11 exam syllabus. Information about Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics covers topics
like and Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics Example, for Grade 11 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics.
Introduction of Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics in English is available as part of our Physics for Grade 11
for Grade 11 & Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics in Hindi for Physics for Grade 11 course.
Download more important topics related with notes, lectures and mock test series for Grade 11
Exam by signing up for free. Grade 11: Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics | Physics for Grade 11
Description
Full syllabus notes, lecture & questions for Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics | Physics for Grade 11 - Grade 11 | Plus excerises question with solution to help you revise complete syllabus for Physics for Grade 11 | Best notes, free PDF download
Information about Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics
In this doc you can find the meaning of Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics defined & explained in the simplest way possible. Besides explaining types of
Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics theory, EduRev gives you an ample number of questions to practice Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics tests, examples and also practice Grade 11
tests
|
Explore Courses for Grade 11 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
Semester Notes
,Past Year Paper
,mock tests for examination
,past year papers
,Class 11
,Previous Year Questions with Solutions
,Important questions
,Exam
,Physics (Set - 1)
,Class 11
,study material
,Viva Questions
,Physics | Physics for Grade 11
,Sample Paper
,Past Year Paper
,Physics (Set - 1)
,video lectures
,Summary
,Physics (Set - 1)
,Past Year Paper
,Physics | Physics for Grade 11
,shortcuts and tricks
,2018
,2018
,Free
,Objective type Questions
,practice quizzes
,Extra Questions
,Class 11
,ppt
,Physics | Physics for Grade 11
,2018
,MCQs
;
Additional Information about Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics for Grade 11 Preparation
Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics Free PDF Download
The Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics is an invaluable resource that delves deep into the core of the Grade 11 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 Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics now and kickstart your journey towards success in the Grade 11 exam.
Importance of Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics
The importance of Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics cannot be overstated, especially for Grade 11 aspirants.
This document holds the key to success in the Grade 11 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.
Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics Notes
Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics Notes offer in-depth insights into the specific topic to help you master it with ease.
This comprehensive document covers all aspects related to Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics.
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, Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics Notes on EduRev are your ultimate resource for success.
Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics Grade 11 Questions
The "Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics Grade 11 Questions" guide is a valuable resource for all aspiring students preparing for the
Grade 11 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 Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics on the App
Students of Grade 11 can study Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics,
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 Past Year Paper, Physics (Set - 1), 2018, Class 11, Physics is prepared as per the latest Grade 11 syllabus.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup