Grade 11 Exam > Grade 11 Notes > Physics for Grade 11 > Past Year Paper, Physics (Set - 1), 2019, Class 11, Physics
Past Year Paper, Physics (Set - 1), 2019, 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 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 . N a m e t h e t w o p a i r s o f p h y s i c a l q u a n t i t i e s w h o s e d i m e n s i o n s a r e s a m e . A n s . a ) S t r e s s a n d Y o u n g ’ s M o d u l u s b ) W o r k a n d E n e r g y 2 . W h a t i s t h e a p p a r e n t w e i g h t f e l t b y a p e r s o n i n a n e l e v a t o r , w h e n i t i s a c c e l e r a t i n g ? ( i ) u p w a r d a n d ( i i ) d o w n w a r d A n s . i ) A p p a r e n t w e i g h t = m ( g + a ) i i ) A p p a r e n t w e i g h t = m ( g - a ) 3 . J u s t i f y : “ W h e n s e v e r a l p a s s e n g e r s a r e s t a n d i n g i n a m o v i n g b u s , i t i s s a i d t o b e Page 2 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 . N a m e t h e t w o p a i r s o f p h y s i c a l q u a n t i t i e s w h o s e d i m e n s i o n s a r e s a m e . A n s . a ) S t r e s s a n d Y o u n g ’ s M o d u l u s b ) W o r k a n d E n e r g y 2 . W h a t i s t h e a p p a r e n t w e i g h t f e l t b y a p e r s o n i n a n e l e v a t o r , w h e n i t i s a c c e l e r a t i n g ? ( i ) u p w a r d a n d ( i i ) d o w n w a r d A n s . i ) A p p a r e n t w e i g h t = m ( g + a ) i i ) A p p a r e n t w e i g h t = m ( g - a ) 3 . J u s t i f y : “ W h e n s e v e r a l p a s s e n g e r s a r e s t a n d i n g i n a m o v i n g b u s , i t i s s a i d t o b e d a n g e r o u s . ” A n s . H e r e , t h e c e n t r e o f g r a v i t y o f t h e s y s t e m i s r a i s e d a n d a s s u c h t h e w h o l e s y s t e m i s i n a n u n s t a b l e e q u i l i b r i u m . W h e n t h e r u n n i n g b u s s u d d e n l y s t o p s d u e t o i n e r t i a o f m o t i o n , t h e p a s s e n g e r s f a l l f o r w a r d o n e a c h o t h e r a n d c a u s e s t a m p e d e . 4 . W h a t a r e t h e f a c t o r s o n w h i c h t h e d e g r e e s o f f r e e d o m o f g a s d e p e n d ? A n s . i ) A t o m i c i t y i i ) T e m p e r a t u r e 5 . W h a t a r e t h e c h a r a c t e r i s t i c s o f e l a s t i c c o l l i s i o n ? A n s . i ) K i n e t i c e n e r g y o f t h e s y s t e m r e m a i n s c o n s e r v e d . i i ) L i n e a r m o m e n t u m o f t h e s y s t e m r e m a i n s c o n s e r v e d . 6 . I f b r e a k i n g s t r e s s o f s t e e l = 8 . 0 x 1 0 8 N m - 3 , d e n s i t y o f s t e e l = 8 . 0 x 1 0 3 k g m - 3 a n d g = 1 0 m s - 2 , f i n d t h e g r e a t e s t l e n g t h o f s t e e l w i r e t h a t c a n h a n g v e r t i c a l l y w i t h o u t b r e a k i n g . O r A s t e e l w i r e 0 . 7 2 m l o n g h a s a m a s s o f 5 . 0 x 1 0 - 3 k g . I f t h e w i r e i s u n d e r a t e n s i o n o f 6 0 N , t h e n w h a t i s t h e s p e e d o f t h e t r a n s v e r s e w a v e s o n t h e w i r e ? A n s . L e t ‘ L ’ b e t h e m a x i m u m l e n g t h o f t h e s t e e l w i r e w h i c h c a n b e h a n g v e r t i c a l l y w i t h o u t b r e a k i n g . I n s u c h a c a s e t h e s t r e t c h i n g f o r c e i s e q u a l t o t h e o w n w e i g h t o f w i r e . I f ‘ A ’ b e t h e c r o s s - s e c t i o n a r e a o f w i r e a n d ? i t s d e n s i t y , M a s s o f t h e w i r e M = A L P S t r e t c h i n g f o r c e F = m g = A L P g M a x i m u m S t r e s s O r M a s s p e r u n i t l e n g t h o f t h e w i r e , µ = = 6 . 9 x 1 0 - 3 k g / m T h e s p e e d o f w a v e o n t h e w i r e , ? = = 9 3 m / s 7 . W h a t w i l l b e t h e r a t i o o f t h e m o m e n t s o f m a s s e s i f o n e o f t h e m a s s i s ‘ n ’ t i m e s a s h e a v y a s t h e o t h e r , h a v e e q u a l K . E ? Page 3 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 . N a m e t h e t w o p a i r s o f p h y s i c a l q u a n t i t i e s w h o s e d i m e n s i o n s a r e s a m e . A n s . a ) S t r e s s a n d Y o u n g ’ s M o d u l u s b ) W o r k a n d E n e r g y 2 . W h a t i s t h e a p p a r e n t w e i g h t f e l t b y a p e r s o n i n a n e l e v a t o r , w h e n i t i s a c c e l e r a t i n g ? ( i ) u p w a r d a n d ( i i ) d o w n w a r d A n s . i ) A p p a r e n t w e i g h t = m ( g + a ) i i ) A p p a r e n t w e i g h t = m ( g - a ) 3 . J u s t i f y : “ W h e n s e v e r a l p a s s e n g e r s a r e s t a n d i n g i n a m o v i n g b u s , i t i s s a i d t o b e d a n g e r o u s . ” A n s . H e r e , t h e c e n t r e o f g r a v i t y o f t h e s y s t e m i s r a i s e d a n d a s s u c h t h e w h o l e s y s t e m i s i n a n u n s t a b l e e q u i l i b r i u m . W h e n t h e r u n n i n g b u s s u d d e n l y s t o p s d u e t o i n e r t i a o f m o t i o n , t h e p a s s e n g e r s f a l l f o r w a r d o n e a c h o t h e r a n d c a u s e s t a m p e d e . 4 . W h a t a r e t h e f a c t o r s o n w h i c h t h e d e g r e e s o f f r e e d o m o f g a s d e p e n d ? A n s . i ) A t o m i c i t y i i ) T e m p e r a t u r e 5 . W h a t a r e t h e c h a r a c t e r i s t i c s o f e l a s t i c c o l l i s i o n ? A n s . i ) K i n e t i c e n e r g y o f t h e s y s t e m r e m a i n s c o n s e r v e d . i i ) L i n e a r m o m e n t u m o f t h e s y s t e m r e m a i n s c o n s e r v e d . 6 . I f b r e a k i n g s t r e s s o f s t e e l = 8 . 0 x 1 0 8 N m - 3 , d e n s i t y o f s t e e l = 8 . 0 x 1 0 3 k g m - 3 a n d g = 1 0 m s - 2 , f i n d t h e g r e a t e s t l e n g t h o f s t e e l w i r e t h a t c a n h a n g v e r t i c a l l y w i t h o u t b r e a k i n g . O r A s t e e l w i r e 0 . 7 2 m l o n g h a s a m a s s o f 5 . 0 x 1 0 - 3 k g . I f t h e w i r e i s u n d e r a t e n s i o n o f 6 0 N , t h e n w h a t i s t h e s p e e d o f t h e t r a n s v e r s e w a v e s o n t h e w i r e ? A n s . L e t ‘ L ’ b e t h e m a x i m u m l e n g t h o f t h e s t e e l w i r e w h i c h c a n b e h a n g v e r t i c a l l y w i t h o u t b r e a k i n g . I n s u c h a c a s e t h e s t r e t c h i n g f o r c e i s e q u a l t o t h e o w n w e i g h t o f w i r e . I f ‘ A ’ b e t h e c r o s s - s e c t i o n a r e a o f w i r e a n d ? i t s d e n s i t y , M a s s o f t h e w i r e M = A L P S t r e t c h i n g f o r c e F = m g = A L P g M a x i m u m S t r e s s O r M a s s p e r u n i t l e n g t h o f t h e w i r e , µ = = 6 . 9 x 1 0 - 3 k g / m T h e s p e e d o f w a v e o n t h e w i r e , ? = = 9 3 m / s 7 . W h a t w i l l b e t h e r a t i o o f t h e m o m e n t s o f m a s s e s i f o n e o f t h e m a s s i s ‘ n ’ t i m e s a s h e a v y a s t h e o t h e r , h a v e e q u a l K . E ? A n s . p 1 : p 2 = : 1 8 . A b o y i s s w i n g i n g i n t h e s i t t i n g p o s i t i o n . H o w w i l l t h e p e r i o d o f t h e s w i n g b e c h a n g e d i f h e s t a n d s u p ? A n s . W e c a n u s e t h e c o n c e p t o f s i m p l e p e n d u l u m . W e k n o w t h a t t h e t i m e p e r i o d o f a s i m p l e p e n d u l u m i s g i v e n b y , W h e n t h e b o y s t a n d s u p , t h e d i s t a n c e b e t w e e n t h e p o i n t o f s u s p e n s i o n a n d t h e c e n t r e o f m a s s o f t h e s w i n g i n g b o d y w i l l d e c r e a s e , s o T w i l l d e c r e a s e . 9 . I f t h e m a s s o f a b o x m e a s u r e d b y a g r o c e r ’ s b a l a n c e i s 2 . 3 k g a n d t w o g o l d p i e c e s o f m a s s e s 2 0 . 1 5 g a n d 2 0 . 1 7 g a r e a d d e d t o t h e b o x , t h e n c a l c u l a t e a ) T h e t o t a l m a s s o f t h e b o x . b ) T h e d i f f e r e n c e i n t h e m a s s e s o f t h e p i e c e s t o c o r r e c t s i g n i f i c a n t f i g u r e s . A n s . a ) T o t a l m a s s o f t h e b o x = ( 2 . 3 + 0 . 0 2 1 7 + 0 . 0 2 1 5 ) k g = 2 . 3 4 2 2 k g S i n c e t h e l e a s t n u m b e r o f d e c i m a l p l a c e s i s 1 , t h e t o t a l m a s s o f t h e b o x = 2 . 3 k g b ) D i f f e r e n c e o f m a s s = 2 . 1 7 – 2 . 1 5 = 0 . 0 2 g S i n c e t h e l e a s t n u m b e r o f d e c i m a l p l a c e s i s 2 , s o t h e d i f f e r e n c e i n m a s s e s t o t h e c o r r e c t s i g n i f i c a n t f i g u r e s i s 0 . 0 2 g 1 0 . W h a t i s t h e a n g l e o f p r o j e c t i o n a t w h i c h t h e H m a x a n d r a n g e a r e e q u a l ? A n s . S i n 2 ? = 2 x 2 s i n ? c o s ? S i n ? = 4 c o s ? T a n ? = 4 ? = t a n - 1 ( 4 ) Page 4 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 . N a m e t h e t w o p a i r s o f p h y s i c a l q u a n t i t i e s w h o s e d i m e n s i o n s a r e s a m e . A n s . a ) S t r e s s a n d Y o u n g ’ s M o d u l u s b ) W o r k a n d E n e r g y 2 . W h a t i s t h e a p p a r e n t w e i g h t f e l t b y a p e r s o n i n a n e l e v a t o r , w h e n i t i s a c c e l e r a t i n g ? ( i ) u p w a r d a n d ( i i ) d o w n w a r d A n s . i ) A p p a r e n t w e i g h t = m ( g + a ) i i ) A p p a r e n t w e i g h t = m ( g - a ) 3 . J u s t i f y : “ W h e n s e v e r a l p a s s e n g e r s a r e s t a n d i n g i n a m o v i n g b u s , i t i s s a i d t o b e d a n g e r o u s . ” A n s . H e r e , t h e c e n t r e o f g r a v i t y o f t h e s y s t e m i s r a i s e d a n d a s s u c h t h e w h o l e s y s t e m i s i n a n u n s t a b l e e q u i l i b r i u m . W h e n t h e r u n n i n g b u s s u d d e n l y s t o p s d u e t o i n e r t i a o f m o t i o n , t h e p a s s e n g e r s f a l l f o r w a r d o n e a c h o t h e r a n d c a u s e s t a m p e d e . 4 . W h a t a r e t h e f a c t o r s o n w h i c h t h e d e g r e e s o f f r e e d o m o f g a s d e p e n d ? A n s . i ) A t o m i c i t y i i ) T e m p e r a t u r e 5 . W h a t a r e t h e c h a r a c t e r i s t i c s o f e l a s t i c c o l l i s i o n ? A n s . i ) K i n e t i c e n e r g y o f t h e s y s t e m r e m a i n s c o n s e r v e d . i i ) L i n e a r m o m e n t u m o f t h e s y s t e m r e m a i n s c o n s e r v e d . 6 . I f b r e a k i n g s t r e s s o f s t e e l = 8 . 0 x 1 0 8 N m - 3 , d e n s i t y o f s t e e l = 8 . 0 x 1 0 3 k g m - 3 a n d g = 1 0 m s - 2 , f i n d t h e g r e a t e s t l e n g t h o f s t e e l w i r e t h a t c a n h a n g v e r t i c a l l y w i t h o u t b r e a k i n g . O r A s t e e l w i r e 0 . 7 2 m l o n g h a s a m a s s o f 5 . 0 x 1 0 - 3 k g . I f t h e w i r e i s u n d e r a t e n s i o n o f 6 0 N , t h e n w h a t i s t h e s p e e d o f t h e t r a n s v e r s e w a v e s o n t h e w i r e ? A n s . L e t ‘ L ’ b e t h e m a x i m u m l e n g t h o f t h e s t e e l w i r e w h i c h c a n b e h a n g v e r t i c a l l y w i t h o u t b r e a k i n g . I n s u c h a c a s e t h e s t r e t c h i n g f o r c e i s e q u a l t o t h e o w n w e i g h t o f w i r e . I f ‘ A ’ b e t h e c r o s s - s e c t i o n a r e a o f w i r e a n d ? i t s d e n s i t y , M a s s o f t h e w i r e M = A L P S t r e t c h i n g f o r c e F = m g = A L P g M a x i m u m S t r e s s O r M a s s p e r u n i t l e n g t h o f t h e w i r e , µ = = 6 . 9 x 1 0 - 3 k g / m T h e s p e e d o f w a v e o n t h e w i r e , ? = = 9 3 m / s 7 . W h a t w i l l b e t h e r a t i o o f t h e m o m e n t s o f m a s s e s i f o n e o f t h e m a s s i s ‘ n ’ t i m e s a s h e a v y a s t h e o t h e r , h a v e e q u a l K . E ? A n s . p 1 : p 2 = : 1 8 . A b o y i s s w i n g i n g i n t h e s i t t i n g p o s i t i o n . H o w w i l l t h e p e r i o d o f t h e s w i n g b e c h a n g e d i f h e s t a n d s u p ? A n s . W e c a n u s e t h e c o n c e p t o f s i m p l e p e n d u l u m . W e k n o w t h a t t h e t i m e p e r i o d o f a s i m p l e p e n d u l u m i s g i v e n b y , W h e n t h e b o y s t a n d s u p , t h e d i s t a n c e b e t w e e n t h e p o i n t o f s u s p e n s i o n a n d t h e c e n t r e o f m a s s o f t h e s w i n g i n g b o d y w i l l d e c r e a s e , s o T w i l l d e c r e a s e . 9 . I f t h e m a s s o f a b o x m e a s u r e d b y a g r o c e r ’ s b a l a n c e i s 2 . 3 k g a n d t w o g o l d p i e c e s o f m a s s e s 2 0 . 1 5 g a n d 2 0 . 1 7 g a r e a d d e d t o t h e b o x , t h e n c a l c u l a t e a ) T h e t o t a l m a s s o f t h e b o x . b ) T h e d i f f e r e n c e i n t h e m a s s e s o f t h e p i e c e s t o c o r r e c t s i g n i f i c a n t f i g u r e s . A n s . a ) T o t a l m a s s o f t h e b o x = ( 2 . 3 + 0 . 0 2 1 7 + 0 . 0 2 1 5 ) k g = 2 . 3 4 2 2 k g S i n c e t h e l e a s t n u m b e r o f d e c i m a l p l a c e s i s 1 , t h e t o t a l m a s s o f t h e b o x = 2 . 3 k g b ) D i f f e r e n c e o f m a s s = 2 . 1 7 – 2 . 1 5 = 0 . 0 2 g S i n c e t h e l e a s t n u m b e r o f d e c i m a l p l a c e s i s 2 , s o t h e d i f f e r e n c e i n m a s s e s t o t h e c o r r e c t s i g n i f i c a n t f i g u r e s i s 0 . 0 2 g 1 0 . W h a t i s t h e a n g l e o f p r o j e c t i o n a t w h i c h t h e H m a x a n d r a n g e a r e e q u a l ? A n s . S i n 2 ? = 2 x 2 s i n ? c o s ? S i n ? = 4 c o s ? T a n ? = 4 ? = t a n - 1 ( 4 ) 1 1 . A C a r n o t e n g i n e w h o s e h e a t s i n k i s a t 2 7 0 C h a s a n e f f i c i e n c y o f 4 0 % . B y h o w m a n y d e g r e e s s h o u l d t h e t e m p e r a t u r e o f s o u r c e b e c h a n g e d t o i n c r e a s e t h e e f f i c i e n c y b y 1 0 % o f t h e o r i g i n a l e f f i c i e n c y ? O r A f l a s k c o n t a i n s a r g o n a n d c h l o r i n e i n t h e r a t i o 2 : 1 b y m a s s . T h e t e m p e r a t u r e o f t h e m i x t u r e i s 2 7 0 C . O b t a i n t h e r a t i o o f i ) A v e r a g e K . E . p e r m o l e c u l e i i ) R o o t m e a n s q u a r e s p e e d v m a x o f t h e m o l e c u l e s o f t h e t w o g a s e s . G i v e n : A t o m i c m a s s o f a r g o n = 3 9 . 9 u ; M o l e c u l a r m a s s o f c h l o r i n e = 7 0 . 9 u . A n s . T 2 = 2 7 0 C = 2 7 + 2 7 3 = 3 0 0 K ? = 4 0 % . T 2 = ? T 1 = I n c r e a s e i n e f f i c i e n c y = 1 0 % o f 4 0 = 4 % N e w e f f i c i e n c y ? ’ = 4 0 + 4 = 4 4 % L e t T 1 ’ b e t h e n e w t e m p e r a t u r e o f t h e s o u r c e , I n c r e a s e i n t e m p e r a t u r e o f s o u r c e = 5 3 5 . 7 – 5 0 0 = 3 5 . 7 K O r T h e i m p o r t a n t p o i n t t o r e m e m b e r i s t h a t t h e a v e r a g e K . E o f a n y g a s i s a l w a y s e q u a l t o ( 3 / 2 ) k B T . I t d e p e n d s o n l y o n t e m p e r a t u r e a n d i s i n d e p e n d e n t o f t h e n a t u r e o f t h e g a s . ( i ) S i n c e a r g o n a n d c h l o r i n e b o t h t h e s a m e t e m p e r a t u r e i n t h e f l a s k , t h e r a t i o o f a v e r a g e K . E o f t h e t w o g a s e s i s 1 : 1 ( i i ) N o w ½ m v m a x 2 = a v e r a g e K . E p e r m o l e c u l e = ( 3 / 2 ) k B T , w h e r e m i s t h e m a s s o f m o l e c u l e o f t h e g a s . Page 5 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 . N a m e t h e t w o p a i r s o f p h y s i c a l q u a n t i t i e s w h o s e d i m e n s i o n s a r e s a m e . A n s . a ) S t r e s s a n d Y o u n g ’ s M o d u l u s b ) W o r k a n d E n e r g y 2 . W h a t i s t h e a p p a r e n t w e i g h t f e l t b y a p e r s o n i n a n e l e v a t o r , w h e n i t i s a c c e l e r a t i n g ? ( i ) u p w a r d a n d ( i i ) d o w n w a r d A n s . i ) A p p a r e n t w e i g h t = m ( g + a ) i i ) A p p a r e n t w e i g h t = m ( g - a ) 3 . J u s t i f y : “ W h e n s e v e r a l p a s s e n g e r s a r e s t a n d i n g i n a m o v i n g b u s , i t i s s a i d t o b e d a n g e r o u s . ” A n s . H e r e , t h e c e n t r e o f g r a v i t y o f t h e s y s t e m i s r a i s e d a n d a s s u c h t h e w h o l e s y s t e m i s i n a n u n s t a b l e e q u i l i b r i u m . W h e n t h e r u n n i n g b u s s u d d e n l y s t o p s d u e t o i n e r t i a o f m o t i o n , t h e p a s s e n g e r s f a l l f o r w a r d o n e a c h o t h e r a n d c a u s e s t a m p e d e . 4 . W h a t a r e t h e f a c t o r s o n w h i c h t h e d e g r e e s o f f r e e d o m o f g a s d e p e n d ? A n s . i ) A t o m i c i t y i i ) T e m p e r a t u r e 5 . W h a t a r e t h e c h a r a c t e r i s t i c s o f e l a s t i c c o l l i s i o n ? A n s . i ) K i n e t i c e n e r g y o f t h e s y s t e m r e m a i n s c o n s e r v e d . i i ) L i n e a r m o m e n t u m o f t h e s y s t e m r e m a i n s c o n s e r v e d . 6 . I f b r e a k i n g s t r e s s o f s t e e l = 8 . 0 x 1 0 8 N m - 3 , d e n s i t y o f s t e e l = 8 . 0 x 1 0 3 k g m - 3 a n d g = 1 0 m s - 2 , f i n d t h e g r e a t e s t l e n g t h o f s t e e l w i r e t h a t c a n h a n g v e r t i c a l l y w i t h o u t b r e a k i n g . O r A s t e e l w i r e 0 . 7 2 m l o n g h a s a m a s s o f 5 . 0 x 1 0 - 3 k g . I f t h e w i r e i s u n d e r a t e n s i o n o f 6 0 N , t h e n w h a t i s t h e s p e e d o f t h e t r a n s v e r s e w a v e s o n t h e w i r e ? A n s . L e t ‘ L ’ b e t h e m a x i m u m l e n g t h o f t h e s t e e l w i r e w h i c h c a n b e h a n g v e r t i c a l l y w i t h o u t b r e a k i n g . I n s u c h a c a s e t h e s t r e t c h i n g f o r c e i s e q u a l t o t h e o w n w e i g h t o f w i r e . I f ‘ A ’ b e t h e c r o s s - s e c t i o n a r e a o f w i r e a n d ? i t s d e n s i t y , M a s s o f t h e w i r e M = A L P S t r e t c h i n g f o r c e F = m g = A L P g M a x i m u m S t r e s s O r M a s s p e r u n i t l e n g t h o f t h e w i r e , µ = = 6 . 9 x 1 0 - 3 k g / m T h e s p e e d o f w a v e o n t h e w i r e , ? = = 9 3 m / s 7 . W h a t w i l l b e t h e r a t i o o f t h e m o m e n t s o f m a s s e s i f o n e o f t h e m a s s i s ‘ n ’ t i m e s a s h e a v y a s t h e o t h e r , h a v e e q u a l K . E ? A n s . p 1 : p 2 = : 1 8 . A b o y i s s w i n g i n g i n t h e s i t t i n g p o s i t i o n . H o w w i l l t h e p e r i o d o f t h e s w i n g b e c h a n g e d i f h e s t a n d s u p ? A n s . W e c a n u s e t h e c o n c e p t o f s i m p l e p e n d u l u m . W e k n o w t h a t t h e t i m e p e r i o d o f a s i m p l e p e n d u l u m i s g i v e n b y , W h e n t h e b o y s t a n d s u p , t h e d i s t a n c e b e t w e e n t h e p o i n t o f s u s p e n s i o n a n d t h e c e n t r e o f m a s s o f t h e s w i n g i n g b o d y w i l l d e c r e a s e , s o T w i l l d e c r e a s e . 9 . I f t h e m a s s o f a b o x m e a s u r e d b y a g r o c e r ’ s b a l a n c e i s 2 . 3 k g a n d t w o g o l d p i e c e s o f m a s s e s 2 0 . 1 5 g a n d 2 0 . 1 7 g a r e a d d e d t o t h e b o x , t h e n c a l c u l a t e a ) T h e t o t a l m a s s o f t h e b o x . b ) T h e d i f f e r e n c e i n t h e m a s s e s o f t h e p i e c e s t o c o r r e c t s i g n i f i c a n t f i g u r e s . A n s . a ) T o t a l m a s s o f t h e b o x = ( 2 . 3 + 0 . 0 2 1 7 + 0 . 0 2 1 5 ) k g = 2 . 3 4 2 2 k g S i n c e t h e l e a s t n u m b e r o f d e c i m a l p l a c e s i s 1 , t h e t o t a l m a s s o f t h e b o x = 2 . 3 k g b ) D i f f e r e n c e o f m a s s = 2 . 1 7 – 2 . 1 5 = 0 . 0 2 g S i n c e t h e l e a s t n u m b e r o f d e c i m a l p l a c e s i s 2 , s o t h e d i f f e r e n c e i n m a s s e s t o t h e c o r r e c t s i g n i f i c a n t f i g u r e s i s 0 . 0 2 g 1 0 . W h a t i s t h e a n g l e o f p r o j e c t i o n a t w h i c h t h e H m a x a n d r a n g e a r e e q u a l ? A n s . S i n 2 ? = 2 x 2 s i n ? c o s ? S i n ? = 4 c o s ? T a n ? = 4 ? = t a n - 1 ( 4 ) 1 1 . A C a r n o t e n g i n e w h o s e h e a t s i n k i s a t 2 7 0 C h a s a n e f f i c i e n c y o f 4 0 % . B y h o w m a n y d e g r e e s s h o u l d t h e t e m p e r a t u r e o f s o u r c e b e c h a n g e d t o i n c r e a s e t h e e f f i c i e n c y b y 1 0 % o f t h e o r i g i n a l e f f i c i e n c y ? O r A f l a s k c o n t a i n s a r g o n a n d c h l o r i n e i n t h e r a t i o 2 : 1 b y m a s s . T h e t e m p e r a t u r e o f t h e m i x t u r e i s 2 7 0 C . O b t a i n t h e r a t i o o f i ) A v e r a g e K . E . p e r m o l e c u l e i i ) R o o t m e a n s q u a r e s p e e d v m a x o f t h e m o l e c u l e s o f t h e t w o g a s e s . G i v e n : A t o m i c m a s s o f a r g o n = 3 9 . 9 u ; M o l e c u l a r m a s s o f c h l o r i n e = 7 0 . 9 u . A n s . T 2 = 2 7 0 C = 2 7 + 2 7 3 = 3 0 0 K ? = 4 0 % . T 2 = ? T 1 = I n c r e a s e i n e f f i c i e n c y = 1 0 % o f 4 0 = 4 % N e w e f f i c i e n c y ? ’ = 4 0 + 4 = 4 4 % L e t T 1 ’ b e t h e n e w t e m p e r a t u r e o f t h e s o u r c e , I n c r e a s e i n t e m p e r a t u r e o f s o u r c e = 5 3 5 . 7 – 5 0 0 = 3 5 . 7 K O r T h e i m p o r t a n t p o i n t t o r e m e m b e r i s t h a t t h e a v e r a g e K . E o f a n y g a s i s a l w a y s e q u a l t o ( 3 / 2 ) k B T . I t d e p e n d s o n l y o n t e m p e r a t u r e a n d i s i n d e p e n d e n t o f t h e n a t u r e o f t h e g a s . ( i ) S i n c e a r g o n a n d c h l o r i n e b o t h t h e s a m e t e m p e r a t u r e i n t h e f l a s k , t h e r a t i o o f a v e r a g e K . E o f t h e t w o g a s e s i s 1 : 1 ( i i ) N o w ½ m v m a x 2 = a v e r a g e K . E p e r m o l e c u l e = ( 3 / 2 ) k B T , w h e r e m i s t h e m a s s o f m o l e c u l e o f t h e g a s . W h e r e M d e n o t e s t h e m o l e c u l a r m a s s o f t h e g a s , t a k i n g s q u a r e r o o t o n b o t h s i d e s , N o t e t h a t t h e c o m p o s i t i o n o f t h e m i x t u r e b y m a s s i s q u i t e i r r e l e v a n t t o t h e a b o v e c a l c u l a t i o n . A n y o t h e r p r o p o r t i o n b y m a s s o f a r g o n a n d c h l o r i n e w o u l d g i v e t h e s a m e a n s w e r ( i ) a n d ( i i ) p r o v i d e d t h e t e m p e r a t u r e r e m a i n s u n a l t e r e d . 1 2 . F i n d t h e p r e s s u r e r e q u i r e d t o c o m p r e s s a g a s a d i a b a t i c a l l y a t a t m o s p h e r i c p r e s s u r e t o o n e f i f t h o f i t s v o l u m e ( G i v e n : ? = 1 . 4 ) A n s . P 1 = 1 a t m . V 1 = x c c a n d V 2 = c c ? = 1 . 4 a n d P 2 = ? U s i n g t h e r e l a t i o n P 1 V 1 ? = P 2 V 2 ? P 2 = = ( 5 ) 1 . 4 T a k i n g l o g b o t h s i d e s , w e g e t L o g P 2 = 1 . 4 l o g 5 = 1 . 4 x 0 . 6 9 9 0 = 0 . 9 7 8 6 0 P 2 = 9 . 5 1 9 a t m . 1 3 . I f a b l o c k o f m a s s M i s p l a c e d o n a f r i c t i o n l e s s , i n c l i n e d p l a n e o f a n g l e . D e t e r m i n e a ) T h e a c c e l e r a t i o n o f t h e b l o c k a f t e r i t i s r e l e a s e d b ) T h e f o r c e e x e r t e d b y t h e i n c l i n e o n t h e b l o c k A n s . W h e n t h e b l o c k i s r e l e a s e d , i t w i l l m o v e d o w n t h e i n c l i n e . L e t i t s a c c e l e r a t i o n b e a . A s t h e s u r f a c e i s f r i c t i o n l e s s , s o t h e c o n t a c t f o r c e w i l l b e n o r m a l t o t h e p l a n e . L e t i t b e N .Read More
|
83 videos|257 docs|174 tests
|
FAQs on Past Year Paper, Physics (Set - 1), 2019, Class 11, Physics - Physics for Grade 11
| 1. What is the NEET exam and how does it relate to Physics? |  |
Ans. NEET stands for National Eligibility cum Entrance Test, which is a competitive exam conducted in India for students seeking admission to medical and dental courses. Physics is one of the subjects included in the NEET exam and it tests the candidates' understanding of various concepts and principles in Physics.
| 2. What is the importance of solving past year papers for NEET Physics preparation? | |
Ans. Solving past year papers for NEET Physics is crucial as it helps students familiarize themselves with the exam pattern, understand the types of questions asked, and assess their preparation level. It also gives them an opportunity to practice time management and improve their problem-solving skills.
| 3. How can I effectively prepare for NEET Physics? | |
Ans. To prepare for NEET Physics, it is important to have a clear understanding of the concepts, theories, and formulas. Regular practice of numerical problems and solving sample papers or past year papers will help in strengthening problem-solving skills. Additionally, referring to standard textbooks, attending coaching classes or online tutorials, and seeking clarification for doubts are beneficial for thorough preparation.
| 4. What are some important topics in Physics for NEET exam? | |
Ans. Some important topics in Physics for the NEET exam include Mechanics, Optics, Thermodynamics, Electrostatics, Magnetism, Modern Physics, and Waves. These topics carry significant weightage in the exam and it is essential to have a strong grasp of the concepts and numerical problem-solving skills in these areas.
| 5. Are there any specific strategies to improve time management during the NEET Physics exam? | |
Ans. Yes, there are a few strategies to improve time management during the NEET Physics exam. It is recommended to practice solving questions within a stipulated time frame during the preparation phase. During the exam, it is advisable to quickly skim through the entire question paper to identify easier or familiar questions that can be attempted first. Allotting specific time slots for each section or marking questions that require more time can also help in effectively managing time during the exam.
Related Exams
About this Document
|
1.2K Views |
|
4.79/5 Rating |
|
Dec 23, 2024 Last updated |
Document Description: Past Year Paper, Physics (Set - 1), 2019, 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), 2019, Class 11, Physics have been prepared according to the Grade 11 exam syllabus. Information about Past Year Paper, Physics (Set - 1), 2019, Class 11, Physics covers topics
like and Past Year Paper, Physics (Set - 1), 2019, 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), 2019, Class 11, Physics.
Introduction of Past Year Paper, Physics (Set - 1), 2019, Class 11, Physics in English is available as part of our Physics for Grade 11
for Grade 11 & Past Year Paper, Physics (Set - 1), 2019, 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), 2019, Class 11, Physics | Physics for Grade 11
Description
Full syllabus notes, lecture & questions for Past Year Paper, Physics (Set - 1), 2019, 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), 2019, Class 11, Physics
In this doc you can find the meaning of Past Year Paper, Physics (Set - 1), 2019, Class 11, Physics defined & explained in the simplest way possible. Besides explaining types of
Past Year Paper, Physics (Set - 1), 2019, Class 11, Physics theory, EduRev gives you an ample number of questions to practice Past Year Paper, Physics (Set - 1), 2019, 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
Important questions
,shortcuts and tricks
,Free
,Physics | Physics for Grade 11
,Physics | Physics for Grade 11
,Past Year Paper
,Past Year Paper
,Past Year Paper
,Viva Questions
,MCQs
,Objective type Questions
,Summary
,Class 11
,Physics | Physics for Grade 11
,Sample Paper
,Exam
,ppt
,mock tests for examination
,2019
,Physics (Set - 1)
,video lectures
,2019
,past year papers
,Extra Questions
,Semester Notes
,Physics (Set - 1)
,Class 11
,Physics (Set - 1)
,2019
,study material
,Previous Year Questions with Solutions
,Class 11
,practice quizzes
;
Additional Information about Past Year Paper, Physics (Set - 1), 2019, Class 11, Physics for Grade 11 Preparation
Past Year Paper, Physics (Set - 1), 2019, Class 11, Physics Free PDF Download
The Past Year Paper, Physics (Set - 1), 2019, 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), 2019, Class 11, Physics now and kickstart your journey towards success in the Grade 11 exam.
Importance of Past Year Paper, Physics (Set - 1), 2019, Class 11, Physics
The importance of Past Year Paper, Physics (Set - 1), 2019, 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), 2019, Class 11, Physics Notes
Past Year Paper, Physics (Set - 1), 2019, 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), 2019, 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), 2019, Class 11, Physics Notes on EduRev are your ultimate resource for success.
Past Year Paper, Physics (Set - 1), 2019, Class 11, Physics Grade 11 Questions
The "Past Year Paper, Physics (Set - 1), 2019, 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), 2019, Class 11, Physics on the App
Students of Grade 11 can study Past Year Paper, Physics (Set - 1), 2019, 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), 2019, 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), 2019, 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