User Forum

Digit at the tens place in the number that comes as a difference between 5 hundreds 6 tens 13 ones and 7 hundreds 2 tens 15 ones is _________.

(A) 7

(B) 6

(C) 5

Two satellites S₁ and S₂ revolve around a planet in coplanar circular orbits in the same sense. Their periods of revolution are 1 h and 8 h respectively. The radius of the orbit of S₁ is 10⁴ km. When S₂ is closest to S₁, then the speed of S₂ relative to S₁ will be

Aπ × 10⁴ km h^-1
B2π × 10⁴ km h^-1
C1 × 10⁴ km h^-1
D2 × 10⁴ km h^-1

Choose the correct graph representing different values of resistances for wires made from different materials.


A
B
C
D

          (i)---------(ii)-------(iii)
ATrue------False-----True

BFalse-----True------False

CFalse-----True------True

DTrue------True------False

A fixed volume of water will dissolve a certain amount of salt. If the same volume of water is then heated, more salt can be made to dissolve in it. The best explanation to this is________.

AHeating increases the spaces between the water molecules
BHeating reduces the size of the salt particles
CSalt melts in hot water
DBoth water and salt particles become smaller when heated

During the process of inhalation in human beings _________.

(A) Diaphragm contracts but external intercoastal muscles and lungs expand.

(B) Diaphragm expands but external intercoastal muscles and lungs contract.

(C) Diaphragm and external intercoastal muscles expand but lungs contract.

Which of the following statements are incorrect?
(i) Cellular respiration is a physical process in which food molecules are broken down into carbon dioxide and water.
(ii) Anaerobic respiration involves breakdown of glucose into alcohol and carbon dioxide.
(iii) Breathing rate varies according to oxygen requirement of the body.
(iv) On land, frogs breathe through lungs and in water by gills.
(v) Respiration in plants occurs through stomata and lenticels.

A(i), (ii) and (iv) only
B(i) and (iv) only
C(ii), (iii) and (v) only
D(ii), (iii) and (iv) only

In the given figure who among the following is the primary consumer?


ASnake
BLion
CRabbit
DFrog

Study the given flow chart.

Which among P, Q, R and S could be Mars and Uranus respectively?

A P and R
B Q and S
C S and R
D S and Q

Two persons X and Y went to see a doctor for their respective diseases. The given box shows what they communicated to the doctor about their illness.
Person X : “I have swollen gums that bleed when I brush my teeth or eat anything. My joints are also swollen and keep paining.”
Person Y : “I am unable to see properly in dim light.”
What can be concluded about these persons?

APerson X does not take citrus fruits in his diet.
BPerson Y is suffering from iron deficiency. So he should take lots of green leafy vegetables in his diet.
CPerson X is suffering from scurvy whereas person Y is suffering from rickets.
DBoth the persons are diseased due to deficiency of vitamins but person X is having vitamin A deficiency and person Y is having vitamin C deficiency.