Differential equation of the family of c...

Differential equation of the family of curves `v=A/r+B ,` where `A` and `B` are arbitrary constants, is (a) `( b ) (c) (d)(( e ) (f) d^(( g )2( h ))( i ) v)/( j )(( k ) d (l) r^(( m )2( n ))( o ))( p ) (q)+( r )1/( s ) r (t) (u) (v)(( w ) d v)/( x )(( y ) d r)( z ) (aa)=0( b b )` (cc) (b) `( d d ) (ee) (ff)(( g g ) (hh) d^(( i i )2( j j ))( k k ) v)/( l l )(( m m ) d (nn) r^(( o o )2( p p ))( q q ))( r r ) (ss)-( t t )2/( u u ) r (vv) (ww)( x x )(( y y ) d v)/( z z )(( a a a ) d r)( b b b ) (ccc)=0( d d d )` (eee) (c) `( d ) (e) (f)(( g ) (h) d^(( i )2( j ))( k ) v)/( l )(( m ) d (n) r^(( o )2( p ))( q ))( r ) (s)+( t )2/( u ) r (v) (w) (x)(( y ) d v)/( z )(( a a ) d r)( b b ) (cc)=0( d d )` (ee) (d) None of these

`(d^(2) v)/(dr^(2)) + (1)/(r) *(dv)/(dr)=0`

`(d^(2) v)/(dr^(2))-(2)/(r)(dv)/(dr)=0`

`(d^(2)v)/(dr^(2)) + (2)/(r) *(dv)/(dr)=0`

None of these

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In Fig.93, if A O C is a straight line, then x= (a) ( b ) (c) (d) (e) 42^(( f )0( g ))( h ) (i) (j) (b) ( k ) (l) (m) (n) 52^(( o )0( p ))( q ) (r) (s) (c) ( d ) (e) (f) (g) 142^(( h )0( i ))( j ) (k) (l) (d) ( m ) (n) (o) (p) 38^(( q )0( r ))( s ) (t) (u)

If angles of a linear pair are equal, then the measure of each angle is (a) ( b ) (c) (d) (e) 30^(( f )0( g ))( h ) (i) (j) (b) ( k ) (l) (m) (n) 45^(( o )0( p ))( q ) (r) (s) (c) ( d ) (e) (f) (g) 60^(( h )0( i ))( j ) (k) (l) (d) ( m ) (n) (o) (p) 90^(( q )0( r ))( s ) (t) (u)

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An angle is thrice its supplement. The measure of the angle is (a) ( b ) (c) (d) (e) 120^(( f )0( g ))( h ) (i) (j) (b) ( k ) (l) (m) (n) 105^(( o )0( p ))( q ) (r) (s) (c) ( d ) (e) (f) (g) 135^(( h )0( i ))( j ) (k) (l) (d) ( m ) (n) (o) (p) 150^(( q )0( r ))( s ) (t) (u)

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DISHA PUBLICATION-DIFFERENTIAL EQUATIONS -Exercise-1 : Concept Builder (Topicwise)

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