#### 10th Standard Science English Medium Free Online Test Book Back 1 Mark Questions Part - One

10th Standard

Reg.No. :
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Science

Time : 00:20:00 Hrs
Total Marks : 20

Part A

20 x 1 = 20
1. The unit of ‘g’ is m s-2. It can be also expressed as

(a)

cms-1

(b)

Nkg-1

(c)

Nm2kg-1

(d)

cm2s-2

2. A convex lens forms a real, diminished point sized image at focus. Then the position of the object is at

(a)

focus

(b)

infinity

(c)

at 2f

(d)

between f and 2f

3. In the Given diagram, the possible direction of heat energy transformation is

(a)

A$\leftarrow$B, A$\leftarrow$C, B$\leftarrow$C

(b)

A$\rightarrow$B, A$\rightarrow$C, B$\rightarrow$C

(c)

A$\rightarrow$B, A$\leftarrow$C, B$\rightarrow$C

(d)

A$\leftarrow$B, A$\rightarrow$C, B$\leftarrow$C

4. In a simple circuit, why does the bulb glow when you close the switch?

(a)

The switch produces electricity

(b)

Closing the switch completes the circuit.

(c)

Closing the switch breaks the circuit.

(d)

The bulb is getting charged.

5. The velocity of sound in air at a particular temperature is 330 ms-1. What will be its value when temperature is doubled and the pressure is halved?

(a)

330 ms-1

(b)

165 ms-1

(c)

330 x $\sqrt { 2 }$ ms-1

(d)

320/$\sqrt { 2 }$ ms-1

6. Gamma radiations are dangerous because

(a)

it affects eyes & bones

(b)

it affects tissues

(c)

it produces genetic disorder

(d)

it produces enormous amount of heat

7. In the nuclear reaction 6X12 $\overset { \alpha \ decay }{ \longrightarrow }$ zYA the value of A & Z.

(a)

8, 6

(b)

8, 4

(c)

4, 8

(d)

cannot be determined with the given data

8. Which of the following represents 1 amu?

(a)

Mass of a C – 12 atom

(b)

Mass of a hydrogen atom

(c)

1/12th of the mass of a C – 12 atom

(d)

Mass of O – 16 atom

9. In the alumino thermic process the role of Al is _____.

(a)

oxidizing agent

(b)

reducing agent

(c)

hydrogenating agent

(d)

sulphurising agent

10. Identify the non aqueous solution.

(a)

sodium chloride in water

(b)

glucose in water

(c)

copper sulphate in water

(d)

sulphur in carbon-di-sulphide

11. The chemical equation Na2SO4(aq) + BaCl2(aq) → BaSO4(s)↓ + 2NaCl(aq) represents which of the following types of reaction?

(a)

Neutralisation

(b)

Combustion

(c)

Precipitation

(d)

Single displacement

12. Which of the following pairs can be the successive members of a homologous series?

(a)

C3H8 and C4H10

(b)

C2H2 and C2H4

(c)

CH4 and C3H6

(d)

C2H5OH and C4H8OH

13. Which is formed during anaerobic respiration

(a)

Carbohydrate

(b)

Ethyl alcohol

(c)

Acetyl CoA

(d)

Pyruvate

14. The body of leech has

(a)

23 segments

(b)

33 segments

(c)

38 segments

(d)

30 segments

15. A patient with blood group O was injured in an accident and has blood loss. Which group of blood should be used by doctor for transfusion?

(a)

O group

(b)

AB group

(c)

A or B group

(d)

all blood group

16. Node of Ranvier is found in

(a)

muscles

(b)

axons

(c)

dendrites

(d)

cyton

17. LH is secreted by

(a)

(b)

Thyroid gland

(c)

Anterior pituitary

(d)

Hypothalamus.

18. What is true of gametes?

(a)

They are diploid

(b)

(c)

They produce hormones

(d)

19. The number of chromosomes found in human beings are __________________.

(a)

22 pairs of autosomes and 1 pair of allosomes

(b)

22 autosomes and 1 allosome

(c)

46 autosomes

(d)

46 pairs autosomes and 1 pair of allosomes.

20. We can cut the DNA with the help of

(a)

scissors

(b)

restriction endonucleases

(c)

knife

(d)

RNAase