The picture shows a xylophone. A, B, C and D are the rods in it. Which of the following rods has high pitch of the sound and which has low frequency of vibrations?
|High pitch||Low frequency|
|B||B and C||B and C|
|C||A and D||A and D|
Which of the following represents the correct increasing order of the densities of given substances?
A Cotton < Exhaust from chimneys > Honey < Iron < Air
B Air < Exhaust from chimneys < Cotton < Honey < Iron
C Cotton < Air < Exhaust from chimneys < Iron < Honey
D Air < Cotton < Exhaust from chimneys < Iron < Honey
Which of the following statements are correct?
(i) Cochineal insect is used to eliminate Opuntia.
(ii) Water logging decreases the amount of salts in the soil that increases soil fertility.
(iii) Fertilisers are not readily soluble in water, so they are absorbed by the plants slowly.
(iv) Rust of wheat is a fungal disease.
(v) The practice of growing two or more dissimilar crops in the same field one after the other is called mixed cropping.
A (i), (ii), (iii) and (v) only
B (i) and (iv) only
C (ii) and (iv) only
D (iii), (iv) and (v) only
Crop plants may be attacked by pests which affect the crop production. Fungi are such type of pests which cause diseases like
A Smut of wheat
B Citrus canker
C Blight of potato
D Both (A) and (C).
answer will be D , because both , blight of potato and smut of wheat are caused by a fungus
Which of the following is not the correct
difference between weaving and knitting?
AWeaving is done by machine while knitting is done by hands only.
BWeaving uses one yarn while knitting uses two sets of yarn.
CWeaving is done for silk only while knitting is done for wool only.
DAll of these
Which of the following statements are
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 oscillatory motion.
IV. If a body as a whole moves around in a circular path, the motion is known as revolution.
AI, II and IV only
BI, II and III only
CII, III and IV only
DI, III and IV only
Observe the two shallow dishes kept in the sun carefully containing equal amount of water.
After few hours, in which dish will the water level not come down?
CIn both dishes water level will not come down.
DIn both dishes water level will come down.