Popular Class Vii X Physics Questions

a bear fell from a height of 19.66 m in 2 s.what is the colour of bear to be most likely expected? well u don have to make mere guesses u have to solve this one n show ur working ;) ...

What will be the angle of deviation produced by two mirrors when they are placed 1. parallel to each other 2. perpendicular to each other 3. at an angle of 45° to each other ...

Which weighs more: a kilogram of feathers or a kilogram of iron? ' Hint: "They dont weigh the same" :D ...

→ → → → when A * B (A cross product B)= |A||B|sinθn(unit vector) the direction of the unit vector is taken like this *Image* then my problem is,why the direction of the unit vector is not taken in this direction? *Im ...

We say that something is white in colour because it reflects all the incident wavelengths... Why is it that Mirror is not white? Because, even mirror reflects back all the incident colours! ...

Why can we hear but not see around a corner? (Means around the wall) ...

Why is it that momentum is mv while kinetic energy is 1/2 m v2 and not some other way.. like momentum is 2mv, while KE is mv2 A very very basic and important question which i would like some class IX-X students to answer firs ...

A truck and a car are moving with the same K.E. on a straight line road. If their engines are turned off at the same time, which one of them will stop at a lesser distance? ...

Why can you warm your hands by blowing gently, and cool your hands by blowing hard? ...

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

If 20 Joules of work is done in compressing a spring from 0 cm to 6 cm then find the work done in compressing the same from 3 cm to 6 cm. ...

*Image* The figure shows a block in the influence of a force 500N. Friction working is 100N. The net force causes a displacement of 3m of the body.Find the work done against friction. ...

You want to cool the kitchen by leaving the refrigerator door open. How well will it work? ...

A candle should not be blown off because even the gas that we exhale has a lot of oxygen.. But we all know that presence of oxygen should not lead to dying of the flame Explain this very commonly seen phenomenon? ...

In winter season we feel dat an iron bar is very cool to touch compared to a fire wood why it happens but we know that the temperature shud be the same. ...

How many images will be formed when two mirrors are kept perpendicular?? 5 7 2 3 Your Answer d Correct Answer b how it is possible?MY WAS 3. 8)Find the distance traveled by light in 0.01 seconds in km 3X10^5 3X10^10 3X10^7 3X ...

2day...i saw that there was a cloudy background behind the moon and the moon was almost round...the peculiar thing was that.....there was a red coloured ring around the moon..which gradually faded as the distance increased fr ...

What exactly is the relationship between : i> Light and time? ii> Time and gravity? Please explain. ...

1) A body projected vertically upwards crosses points A and B separated by 28 m with 1/3rd and 1/4th of the velocity respectively. What is the maximum height of reached above the ground. 2) A ball is thrown vertically upwards ...

From Boyle's Law we get V=K/P (K=constant) So, if a comparatively infinite pressure is exerted on a container containing gas, will the volume not become 0? (provided that the gas does not liquiefy or solidify on application o ...

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 ...

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? ...

If diagonal and area of rectangle are 25 m and 168 , then what is the length of the rectangle? 17m 31m 12m 24m ...

If every action has an equal and opposite reaction, then how do we do anything?? ...

Hello guys. I am new to this forum,so nice to meet you all. Instead of chit-chat,I will get to the point at once. I am having problems regarding a Physics problem. Care to solve it for me? The question is as follows :- A ston ...

Can the normal force on an object ever do work? Explain ...

If the acceleration of an object is zero, are no forces acting on it? Explain. ...

We know friction occurs due to irregularities at molecular level,what is the origin of normal reaction between the surfaces? ...

A kilo of iron and a kilo of feathers have same mass.... But in vacuum the scale will tilt toward the feathers..though they weigh same....YA BOSS.... Why? ...

In d Modern Physics chapter in our syllabus(ICSE X), under d Beta emission heading i found something called "anti-neutrino". wud nyone plz say wat is dat. ...