Name: Exam Cracker Science CBSE Question Bank For Class 10th
Brand: Disha Publication
Price: 549 INR
Availability: InStock

Exam Cracker Science CBSE Question Bank For Class 10th

by Madhurima

₹0 ₹0.00(-/ off)

Rating & Reviews

23 Customer Review

Have Doubts Regarding This Product ? Ask Your Question

Q1

Why should magnesium ribbon be cleaned before burning?

A1

To remove the layer of magnesium oxide, ensuring direct reaction with oxygen for a clean combustion experiment.
Q2

Why does distilled water not conduct electricity?

A2

It lacks ions. Only water containing dissolved salts or acids provides ions for electrical conductivity.
Q3

Why are covalent compounds generally poor conductors of electricity?

A3

They do not form ions or free electrons due to shared electrons, preventing electrical current flow.
Q4

What is the role of auxin in plants?

A4

Auxin promotes cell elongation, helping plants grow towards light (phototropism) and away from gravity.
Q5

Define vegetative propagation.

A5

It is a form of asexual reproduction where new plants grow from fragments like stems, roots, or leaves.
Q6

State the two laws of reflection of light.

A6

Angle of incidence equals angle of reflection. Incident ray, reflected ray, and normal lie in the same plane.
Q7

Why does the sky appear dark to an astronaut?

A7

In space, there is no atmosphere to scatter sunlight, so the sky appears dark instead of blue.
Q8

How can you identify the poles of a solenoid?

A8

Use the clock rule or right-hand thumb rule; current direction determines the north and south poles.
Q9

What is the function of a step-up transformer?

A9

It increases alternating voltage from primary to secondary coil while decreasing current proportionally.
Q10

What is the role of decomposers in an ecosystem?

A10

They break down dead organic matter, releasing nutrients back into the soil for reuse by producers.

0.00

0 Overall Rating

5

0
4

0
3

0
2

0
1

0

Try this product & share your review & thoughts

No Description Added

No Table Content Added

Have Doubts Regarding This Product ? Ask Your Question

Q1

Why should magnesium ribbon be cleaned before burning?

A1

To remove the layer of magnesium oxide, ensuring direct reaction with oxygen for a clean combustion experiment.
Q2

Why does distilled water not conduct electricity?

A2

It lacks ions. Only water containing dissolved salts or acids provides ions for electrical conductivity.
Q3

Why are covalent compounds generally poor conductors of electricity?

A3

They do not form ions or free electrons due to shared electrons, preventing electrical current flow.
Q4

What is the role of auxin in plants?

A4

Auxin promotes cell elongation, helping plants grow towards light (phototropism) and away from gravity.
Q5

Define vegetative propagation.

A5

It is a form of asexual reproduction where new plants grow from fragments like stems, roots, or leaves.
Q6

State the two laws of reflection of light.

A6

Angle of incidence equals angle of reflection. Incident ray, reflected ray, and normal lie in the same plane.
Q7

Why does the sky appear dark to an astronaut?

A7

In space, there is no atmosphere to scatter sunlight, so the sky appears dark instead of blue.
Q8

How can you identify the poles of a solenoid?

A8

Use the clock rule or right-hand thumb rule; current direction determines the north and south poles.
Q9

What is the function of a step-up transformer?

A9

It increases alternating voltage from primary to secondary coil while decreasing current proportionally.
Q10

What is the role of decomposers in an ecosystem?

A10

They break down dead organic matter, releasing nutrients back into the soil for reuse by producers.

No Syllabus Added

0.00

0 Overall Rating

5

0
4

0
3

0
2

0
1

0

Try this product & share your review & thoughts