Explain the difference between copy and retain?

926

---

What is the difference between synchronous & asynchronous task ?

899

---

Why do you generally create a weak reference when using self in a block?

872

---

what’s accessibilityhint?

842

---

What is made up of nserror object?

852

---

What is arc and how is it different from autorelease?

819

---

What are the benefits of swift over objective-c ?

853

---

How to avoid anr status?

926

---

Describe the android application architecture.

927

---

What are the multimedia features involved in making android popular?

917

---

What are the different forms of communication provided by the android applications?

856

---

What is the file features used in android?

963

---

What are the different modes of operations used in services for android?

921

---

What are different data storage options are available in android?

939

---

What do you know about intents?

921

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