Previous year Questions paper 2020 class 10th CBSE Board/ Class 10th Science old questions paper 2020 download here/Science solved paper 04 March 2020 Class 10th CBSE Board. Download class 10th Subject Wise previous years questions paper cbse board.
How are covalent bonds formed?
Define electro positivity.
The atomic radii of first group elements are given below
Group 1st Element _ Atomic Radii (pm)
- Na – 86
- K – 231
- Rb – 244
- Cs – 282
State the reason behind the observed trend in the above elements.
Q- Answer questions number 3 (a) to 3 (d) on the basis of your understanding of the following paragraph and the related studies concepts.
The Tehri dam is the highest dam in India and one of the highest in the world. The Tehri dam withholds a reservoir of capacity 4.0 km3 and surface area 52 km2. It is used for irrigation, municipal water supply and the generation of 1000 MW of hydro electricity.
The Tehri Dam has been the object of protests. Environment activist Shri Sunder Lal Bahuguna led the “Anti Tehri Dam Movement” from 1980s to 2014. The protest was against the displacement of twon inhabitants and environmental consequences of the weak ecosystem. The relocation of more than 100000 people form the area has led to protracted leagal battles over resettlement rights and ultimately resulted in the delayed completion of the project.
- How is hydropower harnessed?
- Define 1 MW.
- Mention two disadvantages of constructing Tehri Dam.
- What happens when water from great heights is made to fall blades of turbine?
Previous year Questions paper 2020 class 10th CBSE Board
Question no 4A to 4D are based on table given below. Study the table in which the levels of Thyroid Stimulating Hormone (TSH) in women are given and answer the questions that follow on the basis of understanding of the following paragraph and the related studied concepts.
| Age Range | Normal (mU/L) | Low (mU/L |
| 18 – 29 year | 0.4 – 2.34 mU/L | 0.4 mU/L |
| 30 -49 year | 0.4 – 4.0 mU/L | 0.4 mU/L |
| 50 – 79 year | 0.46 – 4.68 mU/L | 0.46 mU/L |
Women are at greater risk for developing abnormal TSH levels during menstruation, while giving birth and after going through menopause. Around 5% of women in the United States have some kind of thyroid problem compared to 3% of men. Despite claims that high TSH increases your risk for heart disease, a 2013 study found no link between high TSH and heart diseases, But a 2017 study showed that older women are especially at risk for developing thyroid cancer if they have hight TSH levels along with thyroid nodules.
- 35 year old woman has TSH Level 6.03 mU/L. What change should she bring in her diet to control this level.
- When do women face a greater risk of abnormal TSH level?
- State the consequence of low TSH level.
- Name the mireral that is responsible for synthesis of hormone secread by thyroid gland.
Previous year Questions paper 2020 class 10th CBSE Board