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# CIN- U80904UP2015PTC069077

January 9, 2019

December 31, 2018

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# Physics

December 31, 2018

Viscosity

(1.)Essential property of good lubricant

(a)High viscosity     (b)High surface tension   (c)High density   (d)none of them.

(2.)The flow rate of water become  high from a hole in the tank if hole is:

(a)near the bottom        (b)near the top surface        (c)in mid      (d)does not depend on the position of the  of hole.

(3.)A hole is placed near the bottom of the tank. Volume of water flowing from the hole per sec does not depend on.

(a)Area of hole       (b) height of liquid above the hole      (c)Density of liquid

(d)gravity.

(4.) Aeroplane works on

(a)Archimidies principal     (b)Bernoulli principal    (c)Pascal law    (d)stoker law

(5.)Pentagun is based  on

(a)Bernoulli theorem     (b)Boyal’s law       (c)law of Faraday     (d)Archimidies  principle .

(6.)When the velocity of liquid flowing  in a tube increase  then its pressure

(a)increase   (b) decrease      (c)become half    (d)none.

(7.)Bernoulli theorem is based on

(a) conservation of momentum  (b)conservation of pressure (c)conservation of energy  (d) conservation of mass.

(8.)Acceleration  of a body dropping in a viscous fluid with terminal velocity

(a) 0       (b)g         (c)less than g    (d) more than g.

(9.)Viscous force acting  on a sphere of radius  r is proportional to

(a)r        (b)r²        (c)             (d)

(10.)S.I unit of coeff  of viscosity

(a)Kg ms         (b)Kg                (c)Kgm                 (d)Kg

(11.) 1 poise is how much time of S.I unit of viscosity

(a)10 times      (b)equal       (c) times         (d) part

(12.)Terminal velocity of sphere  of radius r is proportional to

(a) r        (b) r²           (c)       (d)

(13.) For narrow tube  Reynolds number is equal to

(a)1        (b)10        (c)1000      (d)

(14.)Viscosity  of liquid varies with the  increase in temp

(a) decrease         (b) increase          (c)remain same        (d) first increase  than decrease

(15.)While increasing the temp the viscosity of gases.

(a)decreasing    (b)increase       (c)remain same       (d) none.

(16.)Terminal velocity  of oil  drop  dropping in air

(a)Proportional  to radius of drop  (b)proportional  to the square of radius      (c)inversely proportional to the radius      (d)none.

(17.)Reason for viscosity

(a)Cohesive  force       (b)Adhesive force          (c)Surface tension     (d) none.

(18.)Viscosity  of an ideal fluid

(a)0            (b)             (c)1              (d)other

(19.)Reason for  floating  of cloud in Atmosphere because of its less

(a)Temp           (b)velocity           (c)Pressure       (d)density.

(20.)Which liquid is more viscous

(a)oil             (b)milk           (c)water            (d)petrol

(21.)When two rain drop having same radius are dropping in air with a terminal velocity of  .1m/s. Find the terminal velocity  if  both drop combine.

(a).1m/s           (b).2m/s             (c).4m/s             (d)none.

(22.)If level of water  is 4.9m. If a narrow hole is made at the bottom of tank. find the velocity of efflux.

(a)10m/s       (b)9.8m/s             (c)8m/s             (d)none.

(23.)If level of water is 4.9m.If a narrow hole is made at the bottom of tank .If Area of cross section if hole is  1 square mm find the flow rate

(a)9.8/sec        (b)9.8/sec       (c)/sec      (d)none

(24.)If  the pressure  difference  between  the two part of a  tube is Find  the work done to push  water inside  the tube.

(a)J        (b)J               (c)J          (d)J

(25.)If velocity  head is 1.25m.Find the velocity  of water

(a)2.5m/s         (b)10m/s          (c)5m/s              (d)15m/s

(26.)If the inside radius of tube is 3 cm and water is flowing at a speed of 3 m/s. Find the flow rate

(a).00847/s          (b).008/s       (c).0085/s         (d)none.

(27.)If  radius of tube is 3cm and the  flow rate is 36 L/hr. find the velocity

(a).3cm/s         (b).35cm/s           (c).37cm/s         (d).38cm/s

(28.)If the  ratio  of terminal speed of two rain drop are 1:4 .find the ratio  of their  masses

(a)1:2        (b)1:4         (c)1:8            (d)1:16

(29.)If the ratio  radius of two small sphere are 1:2 are dropping in a  liquid with same speed. Find  the ratio  of viscous force

(a)1:2           (b)2:1           (c)1:4           (d)4:1

(30)Viscous force acting on a solid ball moving with a terminal  velocity  in air is proportional to

(a)          (b)              (c)            (d)

(31.)If the velocity of  a layer at a distance  of 10 c.m from the top is 20cm/s. find the speed of layer which is at a distance  of 40c.m

(a)10c.m/s             (b)20c.m/s                 (c)30c.m/s            (d)80c.m/s

(32.)If the radius of artiry decrease  to become half of original  radius. Find the ratio of pressure  after and before

(a)1:16             (b)16:1          (c)1:8          (d)8:1