Which of the following statements are incorrect?
(i) A bag placed below the seat of a moving bus is in motion with respect to the floor of the bus.
(ii) While measuring length of an object using a metre scale, use the zero-mark even if the ends are worn out.
(iii) Blinking of eyes is an example of periodic motion.
(iv) If a body as a whole moves around in a circular path, the motion is known as revolution.
A(i), (ii) and (iv) only
B(i), (ii) and (iii) only
C(ii), (iii) and (iv) only
D(i), (iii) and (iv) only
Nisha and Neha were playing together on a street where they accidentally collided with each other and fell down. After that, Neha started feeling pain in her elbow and could not bent it easily. Nisha also developed discomfort in one of her wrists and had difficulty in writing. They visited doctor who told them that their joints were injured. Identify their injured joints and select the correct option regarding them.
|A||Injured joint is the type of joint also present between metacarpal and carpal of thumb.||Injured joint is the type of joint also present between skull and first vertebra of backbone.|
|B||Injured joint is the type of joint also present between upper arm and forearm.||Injured joint is the most freely movable joint of body.|
|C||Injured joint is the type of joint also present between tarsal bones.||Injured joint allows movement primarily in one plane.|
|D||None of these|
The circuit diagram shows four different switches and some wires connected to a light bulb, an electric oven and a printer.
Which of the switches must be closed in order to have the following energy conversion only?
Chemical energy → electrical energy → kinetic and sound energy
BS1 and S2 only
CS1 and S3 only
DS1, S2 and S4 only
Select the incorrect match from the following.
AVenus - Called morning or evening star
BSaturn - Its rings are made of ice, rocks and dust
CJupiter - Largest and fastest spinning planet
DMercury - Hottest planet
Mercury is not the hottest planet, Venus is the hottest planet.
is a source of _________.
AWoollen socks and gloves
BRaincoat and gumboots
CCotton frock and sari
DNone of these
Three identical bulbs namely P, Q and R are connected to a battery as shown. What will happen when the circuit is closed?
A R will glow bright but Q and P will be dim.
B P, Q and R all will glow equally bright.
C Q and R will immediately burnout.
D P will glow bright, but Q and R will be dim.
Ans 1: (Master Answer)
When the key K is closed, an electric current starts flowing in the circuit . The current which passes through bulb P gets divided in bulbs Q and R. For the identical bulbs , the brightness will depend upon the current flowing through the bulbs,So P will glow brighter than Q and R .
Look at the Venn diagram. Which of the following objects described below are most likely to be I, II and III? Choose the correct option.
|A||Oiled paper||Air||Cellophane paper|
|C||Wax paper||Clean water||Diamond|
Soham was given a mixture of camphor, iron filings,
sawdust and salt.
Which of the following represents the correct sequence of steps to separate all the components of this mixture?
A Winnowing, filtration, separating funnel and magnetic separation
B Sedimentation and decantation, heating, filtration and evaporation
C Magnetic separation, heating, filtration and evaporation
D Sedimentation and decantation, handpicking, filtration and evaporation
Refer to the given flow chart and select the incorrect option.
APart P will help a student think, learn and recall her lessons.
BPart Q will help a child to learn the art of riding a bicycle.
CPart R controls our breathing and heartbeat even when we are asleep.
DPart Q will help a person retract his hand when touched by a hot object.
now this is wron' 'cause i, option D it is written part Q but in the solution it's written par' Q plz correc' thi'