Nidhi knocked three metal thumbtacks into the middle section of a block of wood and covered this section with a piece of white paper. Then, she brought a lighted candle near this section.
After few seconds, she removed the lighted candle and found burn marks on the paper except on the areas where the thumbtacks were present. Which of the following best explains this observation?
A The paper was a good conductor of heat.
B The thumbtacks and the paper had different temperatures.
C Some parts of the wood absorbed the heat from the candle flame.
D The thumbtacks conducted heat away quickly before the paper could get burnt.
The house shown in the given figure is favourable for which of the following areas?
A Areas having heavy snowfall and rain
B Areas having hot and dry weather
C Areas having regular floods
D Areas having regular draughts
Match the column I with column II and select the correct option from the codes given below.
|Column I||Column II|
|(A) Object moving with variable speed|
|(B) Object moving is at rest|
|(C) The graph which is not possible|
|(D) Object moving with constant speed|
A (A)-(i), (B)-(ii), (C)-(iii), (D)-(iv)
B (A)-(ii), (B)-(iii), (C)-(iv), (D)-(i)
C (A)-(iii), (B)-(ii), (C)-(i), (D)-(iv)
D (A)-(iv), (B)-(i), (C)-(ii), (D)-(iii)
Aquatic habitats (freshwater or marine) sustain various organisms including mammals, amphibians, etc., each with different kinds of adaptations. Which of the following is incorrect regarding these adaptations?
(A) Blowholes and lungs are the respiratory organs of many aquatic mammals.
(B) Dorsoventrally flattened body is found in many deep sea fishes in order to cope with high pressure.
(C) Many aquatic animals either have streamlined bodies or make their bodies streamlined while swimming.
(D) Gills are the organs of respiration in essentially all fishes.
what is dorsoventrally flattened body?
378 Indian stamps and 588 foreign stamps were pasted in an album in such a way that each page had either Indian or foreign stamps on it. What is the maximum number of stamps that were pasted on each page if the number of stamps were the same on each page?
how do you do this sum?
An object approaches a convergent lens from the left of the lens with a uniform speed 5 m s–1 and stops at the focus. The image
A Moves away from the lens with a uniform speed 5 m s–1
B Moves away from the lens with a uniform acceleration
C Moves away from the lens with a non-uniform acceleration
D Moves towards the lens with a non-uniform acceleration.