When an object undergoes acceleration

(a)

its speed always increase

(b)

a force always acts an it

(c)

its velocity always increases

(d)

velocity always decreases

Velocity of sound in a gaseous medium is 330 ms^-1. If the pressure is increased by 4 times without causing a change in the temperature, the velocity of sound in the gas is

(a)

330 ms^-1

(b)

660 ms^-1

(c)

156 ms^-1

(d)

990 ms^-1

_____ is a relative periodic property.

(a)

atomic radii

(b)

ionic radii

(c)

electron affinity

(d)

electronegativity

Solubility of NaCl in 100 ml water is 36 g. If 25 g of salt is dissolved in 100 ml of water how much more salt is required for saturation _____________

(a)

12g

(b)

11g

(c)

16g

(d)

20g

Which among the following factors affect the rate of a reaction?

(a)

Surface area of reactants

(b)

Pressure

(c)

Temperature

(d)

all the above

The_______ on both sides join to form the genital atrium in leech.

(a)

ejaculatory ducts

(b)

epididymis

(c)

sperm Vesicle

(d)

vas efferens

___________is the main circulatory medium in the human body.

(a)

Blood

(b)

Water

(c)

Lymph

(d)

Plasma

What is true of gametes?

(a)

They are diploid

(b)

They give rise to gonads

(c)

They produce hormones

(d)

They are formed from gonads

The miracle rice which saved millions of lives and celebrated its 50th birthday is _______.

(a)

IR 8

(b)

IR 24

(c)

Atomita 2

(d)

Ponni

Cancer of the epithelial cells is called

(a)

Leukemia

(b)

Sarcoma

(c)

Carcinoma

(d)

Lipoma

To create animations, cartoons and games easily we can use_________

(a)

Paint

(b)

Notepad

(c)

LINUX

(d)

Scratch

How does an astronaut float in a space shuttle?

What is Lens? What are types of lenses?

What happens to the resistance, as the conductor is made thicker?

Define: Relative atomic mass.

Among the following pairs, pick out the smallest
(i) Mg, Ca
(ii) AI, Si
(iii) CI, Br.

The aquatic animals live more in cold region Why?

Describe the ultrastructure of a chloroplast.

Name the endocrine glands associated with kidneys.

What is the name given to the segments of DNA, which are responsible for the inheritance of a particular character?

What is Sprite?

The ratio of masses of two planets is 2:3 and the ratio of their radii is 4:7. Find the ratio of their accelerations due to gravity.

Explain the construction of Simple Microscope and derive its magnification power.

Find the final temperature of a copper rod. Whose area of cross section changes from 10 m² to 11 m² due to heating. The copper rod is initially kept at 90 K. (Coefficient of superficial expansion is 0.0021 /K)

Water boils in an electric kettle in 15 mins after switching on. If the length of the heating wire is decreased to \(\frac{1}{3}\) of its initial value, then in how much time will the same amount of water boil with the same supply voltage?

Write the applications of Doppler effect.

State Soddy and Fajan’s displacement law.

Write notes on
i) saturated solution
ii) unsaturated solution

Write a note an selection.

Differentiate between Type-1 and Type-2 diabetes mellitus

Program for print the word “Hello” with sound

1. How does locomotion take place in leech?

2. How is the structure of DNA organised? What is the biological significance of DNA?

1. If you keep ice at 0°C and water at 0°C in either of your hands, in which hand you will feel more chillness? Why?

2. Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.

1. Plutonium - 239 specimen emits radiation of 4.3 x 10³ GBq per second convert this disintegrations in terms of curie.
   (IBq = 2.703 x 10^-11curie)

2. In the circuit diagram given below, three resistors R₁, R₂ and R₃ of 5 Ω, 10 Ω and 20 Ω respectively are connected as shown. Calculate:
   
   A) Current through each resistor
   B) Total current in the circuit
   C) Total resistance in the circuit