BODY MOVEMENTS
WHAT ARE THE 4 TYPES OF JOINTS
BALL AND SOCKET JOINT , HINGE JOINT , PIVOTAL JOINT AND GLIDING JOINT
IN ____ , THE FRENCH CREATED A STANDARD UNIT OF MEASUREMENT CALLED THE ______ SYSTEM
1790
METRIC
WHAT ARE THE THINGS NEEDED TO FORM A SHADOW?
SCREEN, OPAQUE OBJECT AND A SOURCE OF LIGHT
What is an electric cell?
Electric cell is a source of energy. It produces a small amount of electricity from chemicals stored inside it.
NAME THE TYPES OF SHAPES MAGNETS HAVE.
CYLINDRICAL, BALL ENDED, HORSE SHOE AND BAR MAGNET.
WHICH OF THE SKULL BONES ARE MOVABLE?
LOWER JAW
WHAT ARE THE NON STANDARD UNITS OF MEASUREMENT USED IN ANCIENT INDIA?
ANGUL(FINGER), MUTTHI(FIST), FOOT
What are luminous and non-luminous objects?
Luminous objects: Objects that give out or emit light of their own, e.g., sun, torch, light, bulbs, etc.
Non-luminous objects: Objects that do not give out light of their own, e.g., the moon, chair, shoe, pen, etc.
Sometimes an electric bulb does not glow even if it is connected to the cell. What could be the reason?
This may happen if the bulb has fused.
How many poles are there in a magnet?
There are two poles in a magnet, north-pole and south-pole
HOW IS A BIRD'S BODY ADAPTED FOR FLYING
* BODY IS STREAMLINED
* BONES ARE HOLLOW AND LIGHT
* FORE LIMBS ARE MODIFIED INTO WINGS
DEFINE
RECTILINEAR MOTION
PERIODIC MOTION
RECTILINEAR MOTION= MOTION IN A STRAIGHT LINE.
PERIODIC MOTION= MOTION THAT REPEATS IN THE SAME INTERVAL OF TIME
List natural sources of light. (ATLEAST 3)
What is a filament?
A filament is a thin wire fixed in the middle of a bulb connected to the two supporting wires.
To which part of the magnet do the most of the iron filings (or pins) stick?
Most of the iron filings (or pins) stick to the poles, i.e., north and south poles. At these poles of magnet magnetic effect is maximum
GIVE 2 EXAMPLES OF EACH
HINGE JOINT
BALL SOCKET JOINT
HINGE JOINT= KNEE AND ELBOW JOINT
BALL AND SOCKET JOINT= SHOLDER AND HIP JOINT
WHILE MEASURING A KNITTING NEEDLE THE READING AT ONE END IS 4.0 CM AND AT OTHER END ITS 34.5 CM.WHAT IS THE MEASURMENT OF THE NEEDLE?
30.5 CM
WHAT ARE THE PROPERTIES OF A SHADOW (ATLEAST 2)
1. Shadows are cast by the opaque object, apart from the shape of the object no other details of the object can be viewed.
2. The colour of the shadow is always dark or black, independent of the colour of the object.
3. The shape of the shadow depends on the shape of the object and position of the light source.
WHAT ARE Conductors and Insulators ?
Materials which allow electric current to pass through them are called conductors of electricity. Examples are iron nail, key ETC
Materials which do not allow electric current to pass through them are called insulators of electricity. Examples are rubber, plastic, ETC
What will happen to the magnet when we cut it into two pieces?
When we cut a bar magnet into two pieces, both these pieces act as magnets and we get two magnets
WHAT IS A BALL AND SOCKET JOINT?
WHEN A ROUNDED END OF ONE BONE FITS INTO THE HOLLOW SPACE/ CAVITY OF ANOTHER BONE, WHICH ALLOWS MOVEMENT IN ALL DIRECTIONS.
Define rest and motion.
An object that does not change its positions with time is said to be at rest.
An object that changes its positions with time is said to be in motion.
On a sunny day, does a bird or an aeroplane flying high in the sky cast its shadow on the ground? Under what circumstances can we see their shadow on the ground?
No. An aeroplane and a bird do not cast a shadow on the ground when they are flying high in the sky. This is because shadow will get smaller as distance increases. They can cast a shadow only if they are at some lower height, i.e if they are near the ground.
What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them.
Electric switch is used to make electric circuits open or closed for a particular appliance and hence with the help of a switch we can use an appliance accordingly.
Microwave,Tube light , Piano , Electric Bulb , Geyser , Television , Refrigerator have switches built into them.
What are the properties of a magnet?Define them.
Magnets have certain important properties. They are:
Attractive Property – Magnet attracts ferromagnetic materials like iron, cobalt, and nickel. Repulsive Property – Like magnetic poles repel each other and unlike magnetic poles attract each other.Directive Property: If a magnet is suspended from rigid support such that it can rotate freely, the magnet always points towards the north-south direction.