User Forum

Refer the given diagram that shows nutritional interactions among two organisms (P and R), atmosphere (Q), and lithosphere (S). Identify the two organisms and select the correct option.

Image of an object approaching a convex mirror of radius of curvature of 20 m along its optical axis is observed to move from ²⁵⁄₃ m to ⁵⁰⁄₇ m in 50 s. What is the speed the object?

A0.5 m s^-1
B1 m s^-1
C1.5 m s^-1
D2 m s^-1

An observer can see through a pinhole, the top end of a thin rod of height h, placed as shown in the figure.The beaker height is 3h and its radius is h. When the beaker is filled with a liquid up to a height 2h, he can see the lower end of the rod. Then the refractive index of the liquid is


A⁵⁄₂
B√⁵⁄₂
C√³⁄₂
D³⁄₂

Study the given Venn diagram. If (i) is curdling of milk, (ii) is ripening of fruits, (iii) is volcanic eruptions and (iv) is spoilage of food, then which of the following best identifies P, Q, R and S?

Refer to the given passage and answer the following questions. Two concrete rectangular blocks 1 and 2 have dimensions as shown in figures. Standing on one of its faces as shown, the pressure exerted by block 1 is P. Both the blocks are made of same material.

What is the pressure exerted by block 2 when it stands on the face as shown in figure ?

A(x/2z)p
B(z/x)p
C(x/y)p
D(2y/z)p

Petroleum contains a large number of components having different boiling points. They are separated by fractional distillation as shown in the given figure : The boiling point range of few fractions of petroleum is given in the table.

Identify P, Q, R and S.

-------- P---------Q---------R---------S
AFuel oil--Diesel--Kerosene--Petrol
BKerosene--Petrol--Fuel oil--Diesel
CPetrol--Kerosene--Diesel--Fuel oil
DDiesel--Fuel oil--Petrol--Kerosene

Ms. Abha, a science teacher demonstrated three experiments in lab as follows :

Which of the following observations and inferences drawn is/are correct?

AI and II only
BII and III only
CIII only
DI only

The given diagram shows changes in uterine lining during a menstrual cycle (divided in five phases, a to f).
(i) When release of the egg from the ovary is expected to happen?
(ii) When menstruation is expected to occur?
(iii) If the egg gets fertilized, when implantation of embryo is expected to occur?


A i-d, ii-a to b, iii- e to f
B i-c to d, ii-e to f, iii- a to b
C i-c, ii-a to b, iii- d to e
D i-d to c, ii-c, iii- e to f

Refer to the given dichotomous key and answer the following questions.
I. (A) The cells of tissue have walls. -Go to II
(B) The cells of tissue have no walls.
-Go to III
II. (A) The cells are living. - Go to IV
(B) The cells are dead. - Go to V
III. (A) The tissue lines the oviducts. - R
(B) The tissue transports nutrients. - S
IV. (A) Cells store air. - P
(B) The tissue conducts nutrients. - Q
V. (A) The tissue conducts water. - T
(B) It is only a mechanical tissue. - U
Select the incorrect option regarding tissues P, Q, R, S, T and U.

A P is found in aquatic floating plants whereas T is greatly reduced or absent in aquatic plants.
B R and S are animal tissues while P and Q are plant tissues.
C S can be xylem, Q can be blood and U can be parenchyma.
D R is ciliated epithelial tissue whereas U possesses uniform wall thickenings of lignin.

The given table shows some properties of four substances P, Q, R and S.

Study the table carefully and identify P, Q, R and S.