Frequent Class Vii X Physics Questions

shadow is formed by ______________ objects transparent translucent both of them none of these Your Answer b Correct Answer d How can the answer be none of them ? Transculent objects form a light shadow and transparent objects ...

A cangaroo is capable of jumping to a height of 2.62m. Determine the takeoff speed of the kangaroo. ...

Which one of the following has variable valency? A. Chlorine B. Sulphur C. Iron D. Sodium Your answer : B Correct answer : C Why? ...

A car traveling at 22.4m/s skids to a stop in 2.55s. Determine the skidding distance of the car (assume uniform acceleration). ...

If I am Walking towards east,friction acting on me has a direction a.east b. west c. north d. none of the above your answer b correct answer a how? ...

Why does a porter, carrying a heavy load on his back, bend forward? ...

1. A 8 kg block is at rest on a horizontal floor. If you push horizontally on the 8 kg block with a force of 20 N, it just starts to move. (a) What is the coefficient of static friction? (b) A 10.0 kg block is stacked on top ...

Why is the value of μ greater in sliding friction than rolling friction? ...

Can rolling friction be ever static? ...

Why is static friction more than kinetic friction? Advance thanks to the person who can help me. Thanks, Bye, Angikar ...

Why does the value of μ change for static friction and kinetic friction? Thanks to the person who can help me in advance. Thanks, Bye, Angikar ...

Water is to be pumped to fill a tank of volume 30 kL at a height of 40m from the ground in 15 mins by a pump on the ground floor.What is the electric power consumed by the water pump?Efficiency of pump=30%.. Density of water= ...

a> a fish at a depth d below the water sees a bird flying at a height h above the ground at an apparent distance......??? b> a double convex lens , made of a material of refractive index μ is placed inside two liquids ...

1)Mark the truth: a.Earth is revolving around the Sun. b.Sun is revolving around the Earth. c.Depends on on the Frame of reference we are seeing the bodies from. d.All the above statements are wrong. Your Answer a Correct Ans ...

3)Calculate the current in a wire if 900 C of charge passes through it in 10 minutes. 2A 5A 10A None of these Your Answer d Correct Answer b A=C/t HERE C=900C AND t= 10*60s THEREFORE A=900/600A =1.5A THEN HOW MY ANSWER IS WRO ...

10)A galvanometer can be converted into an ammeter by connecting a high resistance in series connecting a low resistance in parallel connecting a low resistance in series \connecting a high resistance in parallel Your Answer ...

I'm stuck up with another question. Which part of the electromagnetic spectrum is used for : 1) Crystallography 2) Satellite communication In each case , mention the reason for using the particular electromagnetic rays select ...

I am stuck up with another question. During ice-skating,why are no tracks left behind after the skier passes? Anyone care to help me out? Thanks in advance. I need it urgently,as my exam is on Tuesday. ...

Guys,I need some help regarding a question. Two ice cubes get stuck to each other when pressed together. Why? Can anyone answer this question for me? It's a bit urgent as my exam is on Tuesday. ...

How does a tornado form? ...

Prove that mechanical energy is conserved when a body is thrown upwards. Please help me! My exam starts in two days and I need this answer by Friday. IT'S EXTREMELY URGENT. ...

Mass of an electron is- (a)1/1850gm (b)0.1gm (c)9.1x10-28 (d)None of the above ...

The value of gas constant R for hydrogen is- (a)1/2 calorie (b)2 calories/mole Kelvin (c)4 calories (d)1 calorie Please explain how??? ...

There is an equiconvex lens of focal length of 20 cm.If the lens is cut into two equal parts perpendicular to the principle axis,the focal length of each part will be- (a)20cm (b)10cm (c)40cm (d)15cm ...

The door of a running refrigerator inside a closed room was left open.Then- (a)The room will be cooled slightly (b)The temperature of the room will be lowered (c)The temperature of the room will not be affected (d)The room wi ...

In given gas,sound travels at a speed of 300m/s.Find the order of the root-mean-square velocity of the molecules of this gas- (a)40m/s (b)400m/s (c)4000m/s (d)4m/s ...

an electric bulb rated 50W at 100V is used in a circuit having a 200V supply. What resistance R must be put in series with the bulb so that then bulb delivers 500W? ...

An ice cube contains an iron ball in it and floats in water contained in a vessel.What will happen if the ice melts away? a. The water level will go up. b. The water level will go down c. There will be no change in the water ...

two masses A and B of 10kg and 5kg respectively are connected with a string passing over a frictionless pulley fixed at the corner of a table as shown. The coefficient of static friction of A with the table is 0.2. The minimu ...

If the force exerted by 2 charges of 2μC and x C separated by a distance of 25 cm equals the force exerted by a current carrying conductor of 9A in a magnetic field of 32 Tesla and of length 50 cm at angle 30. Then find the ...