Handpicking

Q.

Naphthalene can be separated from sand by

1. sublimation

2. distillation

3. centrifugation

4. evaporation

Q.

Stone particles can be separated from rice by

1. Sieving

2. Handpicking

3. Threshing

4. Winnowing

Q.

83 Which method is used to separate grains from stalks?

Q.

Question 1

Paheli bought some vegetables such as french beans, lady’s finger, green chillies, brinjals and potatoes all mixed in a bag. Which of the following methods of separation would be most appropriate for her to separate them?

(a) Winnowing

(b) Sieving

(c) Threshing

(d) Hand picking

Q. Stones present in rice can be removed by:

1. sieving

2. handpicking

3. threshing

4. winnowing

Q.

What are the different methods of separating a mixtue of two solids

Q. Paheli bought some vegetables such as french beans, lady’s finger, green chillies and potatoes all mixed in a bag. Which amongst the following is the most appropriate method of seperation in this case?

1. Handpicking
2. Seiving
3. Filtration
4. Sedimentation

Q.

Name the method of separation used to separate seed grains and stalk.

Q.

Handpicking stones from rice is a process of __________.

1. adulteration

2. filtering

3. mixing

4. separation

Q.

Give reason why sand and saw dust cannot be separated by handpicking

Q.

___ is the process of separating the clear liquid above after sedimentation of the components of a mixture.

1. Decantation

2. Filtration

3. Sieving

4. Evaporation

Q.

Smalls stones can be seperated from rice grains by the process of ___

Q. Rotten fruits can be separated from fresh fruits by _________.

1. sieving
2. filtration
3. handpicking
4. winnowing

Q. Paheli bought some vegetables such as French beans, lady’s finger, green chilies, brinjals, and potatoes all mixed in a bag. Which of the following methods of separation would be most appropriate for her to separate them? ​

1. Winnowing​
2. Sieving​
3. Threshing​
4. Handpicking​

Q. How will you separate the mixture of salt, sand and water?

Q.

Which of the following methods is used to clean rice before cooking?

1. Handpicking

2. Sieving

3. Winnowing

4. Filtration

Q.

Lighter particles are separated from heavier particles in a mixture by winnowing

1. True
2. False

Q.

____ is a method of separation of substances based on their sizee, colour, shape and texture.

1. Winnowing

2. Threshing

3. Hand picking

4. Sedimentation

Q.

62 Insects can be separated from wheat by ………..

Q.

Small stones can be separated from the food grains by

1. winnowing

2. sieving

3. magnetic separation

4. hand-picking

Q. Handpicking can only be used for separation when the quantity of the substance to be separated is not large.

1. True
2. False

Q. Select the statement that is incorrect with respect to chromatography.

1. In this technique, rate of movement of components is taken advantage of to separate the mixture
2. It is used to separate solid-solid homogenous mixture.
3. It is used to separate colours in a dye

4. • It is useful technique for the detection of components of food that causes spoilage.

Q. A mixture M is made up of two components P and Q. P is visibly larger and of different colour than Q. Which amongst the following process can be used for the seperation of P and Q?

1. Filtration
2. Handpicking
3. Sieving
4. Winnowing

Q. What are mixtures ?

Q.

84 Name the method used in cashew nut factories to separate cashewnuts of different sizes.

Q. Toppings on a pizza can be separated by which of these separation techniques?

1. Winnowing
2. Threshing
3. Decantation
4. Handpicking

Q.

Raj's mother served him Horlicks with milk.But there were some particles of Horlicks left un-dissolved, he asked his mother to remove those particles. What method of separation should her mother use? [2 MARKS]

Q. The handpicking method is useful for the separation of two substances which are bigger in size and are visibly different.

1. False
2. True

Q.

Gases are separated from each other by :

1. Fractional evaporation

2. Fractional distillation

3. Fractional crystallization

4. Fractional sublimation

Q.

Coriander leaves are separated from mint leaves by _______________. (handpicking/ winnowing)