Recently Active Class Vii X Physics Questions

If 9/10 of an iceberg is underwater what is the density of ice ? 9 gm per cc 900 kg per m^3 Both a and b 9 Kg per m^3 Your Answer b Correct Answer c How 9g/cc =900kg/m^3? ...

If ultrasonic, infrasonic and audio waves travel through a medium with speed v1 v2 and v3 respectively, then v1 = v2 = v3 v1 > v3 > v2 v1 < v3 < v2 v3 ≤ v1 and v1= v3 Your Answer b Correct Answer a 3 WAVES HAVE ...

can anyone explain the meaning of multipole...????n is it related to dipole...??? ...

A radar is able to detect the reflected waves from an enemy aeroplane after a time interval of 0.02ms. if v= 3X10^8m/s. d= ...

In my class X physics book it is written that the expression W=QV "is analogous to the amount of work needed in lifting a weight mg from the earth surface to a vertical height h which is given as W=mg x h = mgh. Obviously on ...

If current I passes through resistance r in time t , the amt of heat energy produced = I2rt My question is that why is this I2 and not I? ...

Why is the emf lesser than the terminal voltage when the cell is charged by passing current through it? ...

HOW CAN THE VELOCITY OF ULTRASOUND, INFRA SOUND AND AUDIO WAVES BE EQUAL? IN THE Q.10 OF THE RECENT CHAKRAVYUH TEST OF CLASS 7 THE OPTIONS O B AND C ARE THE SAME BUT WHY I AM GIVEN WRONG WHEN I PRESS THE OPTION C ? ...

If the shape of the object change, what's its effect on Centre of Gravity ? ...

A person moves a certain dist. in a certain time. 1/3 of dist. is covered in 2/3 of time with speed V1 and 2/3 of distance is covered in 1/3 of time with speed V2 then V1/V2=? a)1/2 b)1/4 c)1/9 d)2/9 ...

Why would I weigh more on the pole than on the Equator? ...

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. ...

Are light waves transverse waves?? ...

A cricketer catches a ball of mass 150 gm in 0.5 sec moving with speed 20 m/sec then he experienced force of a. 300 N b. 30 N c. 3 N d 0.3N ...

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. ...

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 ...

ampere=charge/time A=q/t so why do we call it a fundamental unit? charge should have been the fundamental unit like time. ...

How is a mirage formed? Please post a detailed explanation along with diagrams. ...

A car and truck start from rest at same instant, with car being a little behind the truck. The truck and car has a constant acceleration of 2.2 m/s2 and 3.5 m/s2 respectively. the car overtakes the truck when it(truck) has mo ...

Find the angle between two vectors A and B, when A = 10i + 10j and 1. B = 5i - 5j 2. B = - 5j 3. B = - 5i + 5j ...

If A = 7i - 5j N and B = 29j N be two forces acting on a body of mass 1 kg lying at rest at x = 2 cm, then what will be the displacement of the body after 2 seconds? ...

We drive a distance of 1 km at 16 km/h. Then we drive an additional distance of 1 km at 32 km/h. What is our average speed? ...

*Image* D wheel shown in d diagram has a fixed axle passing thru O. D wheel is kept stationary under d action of i) a horizontal force F1 at A and ii) a vertical force F2 at B. Wich of d force F1 or F2 is greater? Find the ra ...

What is the magnetic field that exerts a force of 2.4 x 10 -4 newtons on a current of 12 amperes in a wire 30 cm , long set perpendicular to the field? ...

the two ends of a train moving with a constant acceleration pass a certain point with velocities u and v respectively.what is the velocity with which the middle point of the train passes the same point? ...

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 ...

the distance travelled by a body in the n th second is (2n+3). find initial velocity and acceleration. ...

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 ...

If every action has its equal and opposite reaction, then why is the universe expanding? It is exerting force and expanding but an equal force should be acting on it to make contract. So it should not be expanding, isn't it? ...